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SWP272164
Short Plat (SHPL # ) REQUEST FOR PROJECT# Prelim. Plat (PP# ) CAG# To: Technical Services Date �` . 3 ��� WON Z- Green# From: Plan Review/Project Manager 9 --7` P)p yc Project Name (70 characters max) Description of Project: 2-� l Circle Size of Waterline: 8" 10" 12" Circle One: New or Extension Circle Size of Sewerline: 8" 10" 12" Circle One: New or Extension Circle Size of Stormline: 12" 15" 18 24" Circle One: New or Extension Address or Street Name(s) % ��U < 2L , Z2 .`Z Dvlpr/Contractor/Owner/Cnslt: lO 4 C (70 characters max) Check each discipline involved in Project Ltr Drwg # of sheets per discipline ❑ Trans-Storm ����/'W, C ✓ ✓ �,�r� (� l (Roadway/Drainage) (Off site improvement_sXinclude basin name) (include TESC sheets) ❑ Transportation ( i ioi Channel ization,Light _ _ O ) O Wastewater 6 1P��n w1 yVeP--_ _ (�12 �� (Sanitary Sewer Main)(include basin name) ❑ Water (Mains,Valves,Hydrants) (Include composite&Horizontal Ctrl Sheets) TS Use Only )C D (6 14 — (D Tina � � i 4 r- �r �� D-164- 64 Approved by TSM Date: Corms/misc/92-090.DOC/CD/bh CONCEPT ENGINEERING, INC. 455 Rainier Boulevard North,Suite 200 'i'TYOFRE.NTON LAM Issaquah,Washington 98027 RECEIVED (206)392-8055 Fax:(206)392-0108 MR 1 31992 SERVICE 1 ' TRIBUTARY BASIN ANALYSIS and ' DRAINAGE DESIGN ' for TALBOT ESTATES Talbot Road Improvements Station 4 + 25 to 7 + 34 1 Developer: Pryde Corporation ' Site Location: 194xx Talbot Rd. S., Renton ' CA 10o�Fs Pt3�a� ' March 13, 1 =EVIRES �7i��� ' 2 99 ' CIVIL ENGINEERING/SURVEYING/LAND USE PLANNING ' 92047 Pryde ' INTRODUCTION The preliminary plat of Talbot Estates consists of 17 lots on 4.36 acres lo- cated within unincorporated King County. The access to the site is off of Talbot Rd. S. approximately at the 19400 block which is located within Ren- ton City Limits. The proposed frontage improvements consist of widening the traveled lane to 18 feet from centerline and installing curb and gutter for controlled drainage. A planter strip and 5 foot sidewalk lie directly behind ' the curbline. This analysis addresses the conveyance requirements of the street drainage with respect to off-site, upstream runoff as well as the ' proposed discharge from the plat improvements. ' UPSTREAM TRIBUTARY AREA Through the use of a quad map and field reconnaissance, the total upstream ' basin is approximately 17.64 acres of residential development of mixed densities. Of this 13.28 acres is off-site area north and east of Talbot Es- tates. The average density of these areas is 2.7 DU/GA. ' All runoff currently passes through a 12" culvert at approximately station 5 +95. This culvert is inadequate in size for the developed basin flows and ' its downstream system is not ideal for conveying the runoff further west. This design proposes to abandon this culvert and route runoff south to an existing 48" CMP culvert system. ' HYDROLOGIC ANALYSIS The contributing basin was analyzed using the Rational method for a 25- year storm event. The total basin area is 17.64 acres therefore the hydrograph methodology is not required. The Rational method tends to give more conservative results than the hydrograph method and requires less sub-basin analysis. For the pipe links upstream of the plat discharge a peak flow was deter- mined using the upstream area of 13.28 acres. The developed "C" value of 0.40 was used, reflecting the density of 2.7 DU/GA. The time of concentra- tion was calculated using the velocity equation. The travel path was divided ' Page 1 ' D:\WS2000\SD.DOC\92047 SD 1.D 0C ' 92047 Pryde ' into flow segments based upon ground slope and velocity factor. The total developed time of concentration (TC) at the beginning of the street improve- ments is 11 .13 minutes. The corresponding rainfall intensity is 1 .94 in/hr for the 25 year event. Therefore the peak runoff is: ' Q25 = CI25A = (0.40)(1 .94)(13.28) = 10.31 cfs Adding the travel time from this point to the discharge of the on-site ' drainage, TC = 11 .5 minutes. The corresponding intensity, 125 = 1 .87 in/hr. The total basin area is 15.12 acres at this point. The design flow is then: ' Q25 = (0.40)(1 .87)(15.12) = 13.2 cfs HYDRAULIC ANALYSIS ' The proposed pipe system consist of 18" N-12 ADS corrugated polyethylene pipe. Due to the high design flows, a backwater analysis was used to design the system profile. The pipe route follows Talbot Road south along ' the plat frontage to approximate station 6+89 where a 48" type II catch basin will be set at the curb return. From here the system will connect with an existing 96" catch basin in the west lane of Talbot Road. A 48" CMP ' culvert passes under Talbot Road, changing direction at this structure. The proposed 18" pipe will enter the CB from the northwest. ' A tailwater elevation of 103.0 was assumed at this outfall. This elevation is slightly greater than the crown of the 48" CMP outlet culvert. The other ' controlling factor is the 18" inlet which picks up ditch flow along Talbot Road north of the site. This invert was set 3 feet below existing shoulder grade to provide enough headwater depth. The calculated headwater eleva- tion may cause stormwater to overflow at this point. The flow will not cross Talbot Road however. Should overflow occur here, it will simply fol- low the proposed gutterline to the next available inlet grate. The hydraulic ' grade line of the remaining system does not create an overflow situation. Page 2 ' D:\WS2OOO\SD.DOC\82O47SD 1.DOC ' 92047 Pryde ' SUMMARY The drainage system for the Talbot Road street improvements has been designed for the 25 year storm flow as calculated using the Rational Method. A conservative basin area and concentration time has been used ' to generate these flows. The system has been analyzed using the standard step backwater method and shown to control the design flows. The exist- ing discharge point for the upstream basins will be abandoned and the ' runoff routed to the existing 48" culvert system under Talbot Road. ' We have tried to be as clear and concise as possible in this analysis. However, should questions arise please feel free to contact us at 392-8055. ' Sincerely, CONCEPT ENGINEERING, INC. ' Chris Searcy, Design Engineer ' Carl Cangie, P.E. ' Page 3 D:\WS2000\SD.DOC\92047SD 1.DOC 92047 Pryde 1 ' APPENDIX A Drainage Calculations PROJECT NO. q2-'�'q CONCEPT ENGINEERING, INC. 455 Rainier Boulevard North, Suite 200 DATE 3/Iz 92 Issaquah, Washington 98027 SUBJECT 7A't-130"1 "10 1*gR4. E (206) 392-8055 CALCS BY: C(f5 SHEET Z/� j7cg► /1' /Vo✓, ... ink k4 E Con- � h� �4•►•t. .i_ .�... k 2 r A 13 a ka.e.. G ...... .. .. : : . E' ... 10000,011 i i i i j i i i i i i t i !.. �/Z L� 0115 p'�..I� Sb 9� G� -i—� 9> 76 :. ... I i E :.... .: l_... .. .. ... i ..,. . . ...... .. . .... ... ...... ... .... ,... . ... ..5.. i _i_ ..i.......L... ...i......5 ..._... �.... : 1 fir .. ... .. .. :.. .. .i........f............. .... .. ... .. ..: .. i. . . ..... .. ... !;......... . ... .. .. ' . . ... e , E . ok . b Av�¢nG Gr+oJ•J p SWV,1E 6)I�P 2 y'l '11.) Zc> ' L 11J . ... . ..... .... . : I i f .. r .... . ... p ,.. ;.. ...s .. - . ... E PROJECT NO. 9zoy7 CONCEPT ENGINEERING, INC. / 455 Rainier Boulevard North, Suite 200 DATE 3112 ���- Issaquah, Washington 98027 SUBJECT T�c.c3o-r Ram f�2p �Nnc.�,_ (206) 392-8055 CALCS BY: Cc S SNEET 3/�0 ..JO. .. O.f.k ....f ... — �2_.i__............. �G►d1.Q.*..Q. _.. ,fG�'S�i;�dY►J ir.g1� �1. w1t N i s . .- € €...... ... i. 1 .....i......... .. 1 i ..'... . : ....:. i , .:... ... ::..:.:: ...... .. €.. .......+ :.._ ...€...... i....... ... .. ......... , YOaVi Q_. . :. ..: ....... ....:.. ... . ..... .. .... ._. .... f i .. q {..... �r..t ;.... .. .. . i i r .. ... . .. .. : ......................... .. i ........ ... : i 920H-7 L3 A-�rc w�-r+�.z �•�,a�,�sls o F Tip.-c_goT �-r� . 3/1�N 192 tIPE NO. 1: 71 LF - 18"CP @ 2 . 00% OUTLET: 102 . 56 INLET: 103 . 98 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 111. 70 BEND: 30 DEG DIA/WIDTH: 4 . 0 Q-RATIO: . 00 ' Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* _t 12 . 40 2 . 34 106. 32 * . 012 1. 34 . 99 . 44 . 99 1. 34 ***** 2 . 34 12 . 80 2 . 43 106 . 41 * . 012 1. 35 1. 02 . 44 1. 02 1. 35 ***** 2 . 43 13 . 20 2 . 53 106. 51 * . 012 1. 36 1. 04 . 44 1. 04 1. 36 ***** 2 .53 13 . 60 2 . 62 106. 60 * . 012 1. 38 1. 06 . 44 1. 06 1. 38 ***** 2 . 62 ' 14 . 00 2 . 72 106. 70 * . 012 1. 39 1. 09 . 44 1. 09 1. 39 ***** 2 .72 TAILwwTE2 ELEV . c 103 , c f�s�0'Av:ico ( CRoL,.)n! or- 4ES" C"P CIO-TLV-C IPE NO. 2 : 93 LF - 18"CP @ 2 . 00% OUTLET: 103 . 98 INLET: 105. 84 INTYP: 5 TUNC NO. 2 : OVERFLOW-EL: 109. 90 BEND: 0 DEG DIA/WIDTH: 2 . 5 Q-RATIO: .28 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI 12 . 40 2 . 65 108 . 49 * . 012 1. 34 .99 2 . 34 2 . 34 1. 59 2 . 44 2 . 65 12 . 80 2 . 76 108 . 60 * . 012 1. 35 1. 02 2 . 43 2 . 43 1. 75 2 . 65 2 . 76 13 . 20 2 . 88 108 . 72 * . 012 1. 36 1. 04 2 . 53 2 . 53 1. 92 2 . 88 2 . 87 13 . 60 3 . 11 108 . 95 * . 012 1. 38 1. 06 2 . 62 2 . 62 2 . 09 3 . 11 2 . 99 14 . 00 3 . 35 109 . 19 * . 012 1. 39 1. 09 2 . 72 2 . 72 2 . 26 3 . 35 3 . 11 IPE NO. 3 : 55 LF - 18"CP @ 1. 20% OUTLET: 105. 84 INLET: 106 . 50 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 109. 60 BEND: 0 DEG DIA/WIDTH: 2 . 5 Q-RATIO: . 00 ' Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 9 . 69 2 . 63 109 . 13 * . 012 1. 21 1. 00 2 . 65 2 . 65 2 . 39 2 . 63 1. 73 10. 00 2 . 78 109 . 28 * . 012 1. 22 1. 02 2 . 76 2 . 76 2 . 52 2 . 78 1. 78 10. 31 2 . 95 109 . 45 * . 012 1. 24 1. 05 2 .88 2 . 88 2 . 67 2 . 95 1.83 10. 62 3 . 10 109 . 72 * . 012 1. 26 1. 07 3 . 11 3 . 11 2 . 93 3 . 22 1. 88 *************** OVERFLOW ENCOUNTERED AT 10. 62 CFS DISCHARGE ***************** �IPE NO. 4 : 113 LF - 18"CP @ 1. 24% OUTLET: 106. 50 INLET: 107 . 90 INTYP: 5 7UNC NO. 4 : OVERFLOW-EL: 111. 40 BEND: 0 DEG DIA/WIDTH: 2 . 5 Q-RATIO: .00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ****************************************************************************** 9. 69 2 . 30 110. 20 * . 012 1. 21 . 99 2 . 63 2 . 63 2 . 06 2 . 30 1.73 10. 00 2 . 51 110. 41 * . 012 1. 22 1. 01 2 . 78 2 . 78 2 . 25 2 . 51 1. 78 r10. 31 2 . 75 110. 65 * . 012 1. 24 1. 03 2 . 95 2 . 95 2 . 47 2 . 75 1. 83 10. 62 2 . 98 110. 88 * . 012 1. 26 1. 06 3 . 10 3 . 10 2 . 69 2 . 98 1.88 10. 94 3 . 12 111. 02 * . 012 1. 27 1. 08 3 . 16 3 . 16 2 . 81 3 . 12 1.94 IPE NO. 5: 40 LF - 18"CP @ 2 . 75% OUTLET: 107 .90 INLET: 109 . 00 INTYP: 3 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ****************************************************************************** 9 . 69 2 . 11 111. 11 * . 012 1. 21 . 77 2 . 30 2 . 30 1. 21 ***** 2 . 11 10. 00 2 . 32 111. 32 * . 012 1. 22 . 78 2 . 51 2 . 51 1. 73 2 . 26 2 . 32 - 10. 31 2 . 61 111. 61 * . 012 1. 24 . 80 2 . 75 2 .75 1. 98 2 . 61 2 . 47 10. 62 2 . 96 111. 96 * . 012 1. 26 . 81 2 . 98 2 . 98 2 . 23 2 . 96 2 . 60 10. 94 3 . 19 112 . 19 * . 012 1. 27 . 82 3 . 12 3 . 12 2 . 39 3 . 19 2 . 72 -n• . � 1� • • - / ram— v' — • 4/ __f4 .go i•s•• • • • • i.• • • .. !1• • •}. �I �• �• elm, •• ••• �� • ��•• • � • •.• •• 1• � sly' �i. / • •• J .........••• . •• • . .I�. • . r • - r� 11• • �s. •I• • •gas•••� • • olio -� • • • + • i, / 'Dots.•••• • • • sees • • U ' • • •• 1• •i . • .•.((. I • so so 0.0 see I) • 16' *so i • as a a 0 0 so OL - we • s Bob • •s • ` / I • e .II / �•' 1 _• ' •p• • • Z ..r..• _ • •1 • gas f • i CDgo - 1 I; all • � `' I ��i 1 f t 1 i • ' • t• ' co ' • i e I • so ll A!II.�!M!_X.fEt Jls'� 2S�- •.0''CA.,t _ _ ` �O N.8 .fe �-.T 77 �► - its y •-flog •�•rii ._. •�E�1/TTW�to .32se •M s. .ems of s S+s CAP. 2y n � i� d •" AK I 'fr� ti I O. c i f ss c2 A� lip0100 �'�Q �` _��_�� Ot ,� ! y.• 1 K ;2.7% 4, ds 4c �l �+e-r, s•v Q 'r is .v..r�. / srONO 14 `.� TR C 3 g a• I 4 v e h �' yr too �, I '1 �' " �j�.°O, oleo •► F w � � � dL \ � ♦ � �71s � 1/10 a / 8 Q G 1 14 TR A u �rt� s�zuv f s °�' c f 'r �� o ry ,,..,p ' per" 1� 33 v 7-2 C12p 0030 �1 016% Id.r v A ` 7 5" � � "Jr.7s y ♦ pro.sb lot 2 . `a �; � �•o� F � � ���y � oao k � ` arr+o 1 a r: �otS 20��� emu. a .s a1z 110647 N �• i Ica 6, s 93 11f..IS �rt� .�.` �r s�� _ f 7 0� r � d�� o �t�_ - � • o�so � � � h ooso c 3944 3 855 r=/•o? 3 ` �.CLfy AC try 641 G 11 ,x A6 V s9 y O a o iR 9 9 ,Alt °p u V � 2 • :P. r�s u- J,s� o,ues_.o �tif ( � a (I « � S Gd (2 �:'. ''�.a+•� -. ,��r 1 n 1! f� Z �011" ecoo �► Pal 1 ScA.LE 0i22 IL If 1 1 1 1 1 1 I 1 I 1 1 1 1 1 1 1 1 1 1 Ew sh� •or WL -� ENGINEERS A Division of DOWL, Incorporated TALBOT ESTATES STORMWATER MANAGEMENT SYSTEIIZ The City of Renton directed DOWL to analyze the project's 'Stormwater Management System, in accordance with the procedures outlined in the Kim; County Surface Water Management Manual (1990). The design of this system is in accordance with the pre- 1990 Manual with additional restrictions by the Hearing Examiner for the plat to consider the 25 year storm with a release rate equal to the 5 year predeveloped rate:. DOWL ran the existing and developed condition hydrographs using the 1990 manual with the Santa Barbara Urban Hydrograph method (King Co. program). The 2-year, 10-year, and 100-year developed condition hydrographs were then routed through the pond model as designed by the Y&W method and included in the plan set for the project. The King Co. routing program was used for this task. RESULTS The developed condition 2-year storm entered the pond with a peak flow rate of 1.39 CFS and was attenuated to 0.66 CFS by the storage/control system, (see the attached table of 8320 154th Avenue NE • REDMOND, WASHINGTON 98052 • 206 - 869-2670 — =- =..;tee =noJ 0 FEDERAL WAY, WASHINGTON 98OC13-6389 • 208 - 927-7850 results). The 10-year storm entered with a peak rate of 2.36 CFS and was attenuated to 1.87 CFS. The pond was not designed to influence the 100-year storm and its entering peak flow rate of 3.51 CFS is also the discharge rate. The existing condition or target peak flow rates appear on the table. Although the system was correctly designed for the Y&W method, it allows a 9% discharge increase over the target level for the 10-year storm when tested by the SBUH method. A further analysis was conducted to determine what could be done to the system to satisfy both methods simultaneously. We found that by running the King County detention pond estimating program, the pond volume was more than sufficient for the 2- and 10-year storms. The systems differed in their approach to sizing the outlet structure orifices. The Y&W method results in much smaller outlet orifices than the updated King County method. By placing larger orifices in the control structure, but using the same size storage volume, the target discharge values are reached for the 2-year and the 10-year storms. (See the attached computer printout of the described procedure using the King County SWM programs.) CONCLUSION The pond size and outlet structure are sufficient to control the runoff to the stated King County requirements. However, the pond allows a 9% increase in the peak discharge rate of the proposed condition hydrograph over the existing condition hydrograph. This could be modified by redesigning the outlet orifices to satisfy the hydrograph routing design method but would increase the more common 2-year and less storm flows. Both the Y&W and TALBOT-3.doc 3 hydrograph routing methods are satisfied with the pond volume, but are not simultaneously satisfied by the outlet orifice sizing. The 100-year storm hydrograph is smoothed out as shown with the graph but the peak flow is not restrained. TALBOT-3.doc A DOWL ENGINEERS I COMPUTATIONS W.o.# S 11081 ' Project Name Client Name Pr ydf/ Sheet of Prepared by: Date Checked by: Date Ta.1�� Cstafi�s Oct ! orYea,r �....._ S to r nm 5. _ - L�X15f/hot COYl1IIrJVL ' laa. _�—._ k,:F/pi,/_Rat� .fi-gM,s�te Rctk Va T -' e- I%a�� -s - - - -,- . nn _. I 1 I � r'Ogose , C0KJ-JI ►\..__.� i _ �ea, __ _I R f _� ►►�to 4 hot P�-� Flo e'l�rokv 31tc' 5 ( 1 ll : i 2.13 C_.. _ .. g , ! ! I ; , ! LL IL d DOWL ENGINEERS COMPUTATIONS W.O•# Project Name Client Name Pi-y d CO r�• Sheet of } Prepared by: /� Date Checked by: Date CS�Gfes -Ibl �0 Oct I J. T n +- h P L11 arta_. o. _1t_V h_._.. a.ri o� . a d"_b. _ L I- a K 1 o ic I" o i~t� r , .. -- - -- A 04. %VIA.rt -I l i e- of_C�h�ex,f'ra orb" _Aroma IhC, Ll41ll� C-C r-0- D� 5ife, Lt-,0 �4L�f S v� Al C N 5 K"L C ' S V-0 k a i yP __as o e / � er_'l A 1 l�e.a.v I P _ _ - i _.....-_ f dSI C.4 n i o►l _ .__....__ i i Jr7�. 1,0 � . 6�� Wi�4wt(0-,.s , VaNAe camp, acres' i, ( N so)/ jo LaK1us ,• 17 to ._ys 07S' ptA-GA - - .0 __ r �� �. Z' _. _ S,e'..._.....�`/ -,_ ,►� ew-viol�s dI'ecv g g L`7 24 el- C.8 '36) .e i i ti TALBOT ESTATES EXISTI 2 YR 10/14/91 JOB NO. 511081 -------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 2 24 2.00 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 4.540 85 0.000 0 6. 4 4.540 85 0.000 0 6. 4 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0.05 12.33 0.23 0 . 17 0 6.33 0.06 12.5 0.23 0. 33 0 6.5 0.07 12.67 0.21 0.5 0 6. 67 0. 1 12.83 0. 19 0. 67 0 6.83 0. 13 13 0. 19 0.83 0 7 0. 14 13. 17 0. 19 1 0 7. 17 0. 19 13.33 0. 19 1. 17 0 7.33 0.24 13.5 0. 19 1.33 0 7. 5 0. 38 13. 67 0. 19 1.5 0 7. 67 0.74 13.83 0. 19 1. 67 0 7.83 0. 8 14 0. 19 1 .83 0 8 0.54 14. 17 0.2 2 0 8. 17 0.39 14.33 0. 2 2. 17 0 8. 33 0.33 14. 5 0.2 2.33 0 8. 5 0. 33 14. 67 0 . 19 2. 5 0 8. 67 0.29 14.83 0. 18 2 . 67 0 8.83 0.24 15 0. 18 2.83 0 9 0.23 15. 17 0. 18 3 0 9. 17 0. 23 15.33 0. 18 3. 17 0 9.33 0. 24 15 .5 0. 18 3. 33 0 9. 5 0.24 15.67 0. 18 3.5 0 9.67 0.24 15.83 0. 18 3. 67 0 9.83 0.25 16 0. 18 3.83 0 10 0.25 16. 17 0. 18 4 0 10. 17 0.25 16.33 0. 18 4. 17 0 10.33 0.26 16. 5 0. 18 4. 33 0 10. 5 0. 26 16. 67 0. 17 4. 5 0 10. 67 0. 24 16.83 0. 15 4. 67 0 10.83 0.22 17 0. 15 4.83 0 11 0. 22 17. 17 0. 15 5 0 11. 17 0.22 17.33 0. 15 5. 17 0 11.33 0.22 17. 5 0. 15 5. 33 0 11 . 5 0. 22 17. 67 0. 15 5.5 0.01 11. 67 0.23 17.83 0. 15 5.67 0.02 11.83 0.23 18 0. 15 5.83 0.03 12 0. 23 18. 17 0. 15 6 0.04 12. 17 0. 23 18. 33 0. 15 TALBOT ESTATES EXISTI 2 YR 10/14/91 JOB NO. 511081 (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0. 15 22.33 0. 16 26. 17 0 18. 67 0. 15 22.5 0. 16 26.83 0 18.83 0. 15 22. 67 0. 16 27 0 19 0. 15 22.83 0. 16 27. 17 0 19. 17 0. 15 23 0. 16 27 .33 0 -19.33 0. 15 23. 17 0. 16 27 .5 0 19.5 0. 15 23. 33 0. 16 27 . 67 0 19. 67 0. 15 - 23.5 0. 16 27.83 0 19.83 0. 15 23. 67 0. 16 0 0 20 0. 15 23.83 0. 16 0 0 20. 17 0. 15 24 0.09 0 0 20. 33 0. 15 24. 17 0.01 0 0 20. 5 0. 15 24.33 0 0 0 20. 67 0. 15 24.5 0 0 0 20.83 0. 15 24. 67 0 0 0 21 0. 15 24.83 0 0 0 21. 17 0. 15 25 0 0 0 21.33 0. 15 25. 17 0 0 0 21.5 0. 16 25.33 0 0 0 21. 67 0. 16 25.5 0.01 0 0 21 .83 0. 16 25. 67 0.01 0 0 22 - 0. 16 25.83 0 0 0 22. 17 0. 16 26 0 0 0 PEAK FLOW = 0.80 (CFS) i EXIST12 YR 0.9 0.8 i i i I � I 0.7 0.6 0.4 o.- 0.1 0 25 30 TIME(HOURS" TALBOT ESTATES EXISTI 10 YR 10/14/91 JOB NO. 511081 FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 10 24 2.90 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) , CN 4.540 85 0.000 0 6. 4 -------------=---------------------------------------- ------------------------------------------------------ 4.540 85 0.000 0 6.4 ------------------------------------------------------ ------------------------------------------------------ TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0. 2 12. 33 0.42 0. 17 0 6.33 0. 22 12.5 0. 42 0.33 0 6. 5 0.23 12. 67 0.38 0. 5 0 6. 67 0. 29 12.83 0. 34 0. 67 0 6.83 0. 36 13 0. 34 0.83 0 7 0. 39 13. 17 0.34 1 0 7. 17 0. 48 13. 33 0. 34 1 . 17 0 7. 33 0.59 13.5 0. 34 1 . 33 0 7. 5 0.9 13. 67 0.34 1. 5 - 0 7. 67 1. 65 13.83 0. 34 1. 67 0 7.83 1.71 14 0. 34 1 .83 0 8 1. 11 14. 17 0.34 2 0 8. 17 0.78 14.33 0. 34 2. 17 0 8.33 0. 66 14. 5 0.35 2. 33 0 8.5 0. 65 14. 67 0. 33 2.5 0 8. 67 0.56 14.83 0.31 2. 67 0 8.83 0.46 15 0. 31 2.83 0 9 0.45 15. 17 0. 31 3 0 9. 17 0. 45 15.33 0. 31 3. 17 0 9.33 0.45 15.5 0.31 3.33 0 9. 5 0. 46 15. 67 0.31 3. 5 0 9. 67 0.46 15.83 0. 31 3. 67 0 9. 83 0.47 16 0.31 3.83 0 10 0.47 16. 17 0.31 4 0 10. 17 0.47 16.33 0. 31 4. 17 0.01 10.33 0. 48 16.5 0.31 4. 33 0.02 10. 5 0.48 16. 67 0. 28 4.5 0.03 10. 67 0. 45 16.83 0. 25 4.67 0.05 10.83 0. 4 17 0. 25 4.83 0.07 11 0. 4 17. 17 0.25 5 0.08 11. 17 0. 4 17.33 0.25 5. 17 0.09 11.33 0.41 17. 5 0.25 5.33 0. 11 11. 5 0. 41 17. 67 0.25 5. 5 0. 12 11. 67 0. 41 17.83 0. 25 5. 67 0. 14 11.83 0. 41 18 0.25 5.83 0. 17 12 0.41 18. 17 0.25 6 0. 19 12. 17 0.42 18.33 0.25 TALBOT ESTATES EXISTI 10 YR 10/14/91 JOB NO. 511081 ------------------------------------------------------------------------ (CONTINUED) TIME FLOW TIME , FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0.25 22.33 0.26 26. 17 0 18.67 0. 25 22.5 0. 26 26.83 0 18.83 0.26 22. 67 0-26 27 0 19 0.26 22.83 0.26 27. 17 0 19. 17 0.26 23 0.26 27. 33 0 19. 33 0.26 23. 17 0.26 27.5 0 19. 5 0. 26 23.33 0. 26 27. 67 0 19. 67 0.26 23.5 0.26 27.83 0 19.83 0. 26 23. 67 0.26 0 0 20 0.26 23.83 0.26 0 0 20. 17 0.26 24 0. 15 0 0 20.33 0.26 24. 17 0.02 0 0 20.5 0.26 24. 33 0 0 0 20. 67 0. 26 24.5 0 0 0 20.83 0.26 24.67 0 0 0 21 0.26 24.83 0 0 0 21. 17 0.26 25 0 0 - 0 21 .33 0. 26 25. 17 0 0 0 21.5 0.26 25. 33 0 0 0 21. 67 0.26 25.5 0.01 0 0 21.83 0.26 25. 67 0.01 0 0 22 0.26 25.83 0 0 0 22. 17 0.26 26 0 0 0 ---------------------------------------- PEAK FLOW = 1 .71 (CFS) -- ---------------------------------------- ---------------------------------------- TLT LESTANTES i.� 1 j .� TTL lT 'T Tr iT l TALBOT ESTATES EXISTI 100 YR 10/14/91 JOB NO. S11081 ------------------------------------------------------------------------ ------------------------------------------------------------------------ FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 100 24 3.90 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 4.540 85 0.000 0 6. 4 ------------------------------------------------------ ------------------------------------------------------ 4. 540 85 0.000 0 6.4 ------------------------------------------------------ ------------------------------------------------------ TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0. 41 12. 33 0. 63 0. 17 0 6.33 0.43 12.5 0.63 0.33 0 6.5 0. 45 12. 67 0.57 0.5 0 6. 67 0. 55 12.83 0.51 0.67 0 6.83 0. 68 13 -0. 5 0.83 0 7 0.72 13. 17 0. 5 1 0 7. 17 0.87 13.33 0. 5 1. 17 0 7. 33 1.04 13.5 0. 5 1.33 0 7. 5 1.55 13. 67 0. 51 1 . 5 0 7. 67 2.76 13.83 0. 51 1 . 67 0 7.83 2.82 14 0.51 1.83 0 8 1.79 14. 17 0. 51 2 0 8. 17 1.25 14. 33 0. 51 2. 17 0 8. 33 1.05 14. 5 0. 51 2. 33 0 8. 5 1.03 14. 67 0. 48 2.5 0 8.67 0.88 14.83 0. 45 2. 67 0 8.83 0.71 15 0. 45 2.83 0 9 0.7 15. 17 0.45 3 0 9. 17 0.7 15. 33 0. 45 3. 17 0 9.33 0.7 15.5 0. 45 3.33 0. 01 9. 5 0.71 15. 67 0. 45 3.5 0. 02 9.67 0.71 15.83 0.45 3.67 0.04 9.83 0.72 16 0.45 3.83 0.07 10 0.72 16. 17 0.46 4 0.09 10. 17 0.73 16. 33 0.46 4. 17 0. 1 10.33 0.73 16.5 0.46 4.33 0. 12 10. 5 0.73 16. 67 0. 42 4.5 0. 14 10. 67 0. 68 16.83 0.37 4.67 0. 17 10.83 0. 62 17 0.37 4.83 0.2 11 0. 61 17. 17 0. 37 5 0.23 11. 17 0. 61 17. 33 0. 37 5. 17 0.25 11.33 0.61 17.5 0. 37 5.33 0.27 11. 5 0. 62 17. 67 0.37 5.5 0.28 11.67 0.62 17.83 0. 37 5. 67 0.32 11.83 0.62 18 0.37 5.83 0.37 12 0. 62 18. 17 0. 37 6 0.39 12. 17 0.62 18.33 0.37 t TALBOT ESTATES EXISTI 100 YR 10/14/91 JOB N0. 511081 (CONTINUED) TIME FLOW TIME , FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0. 37 22.33 0.38 26. 17 0 18. 67 0. 37 22.5 0. 38 26.83 0 18 .83 0.37 22. 67 0.38 27 0 19 0. 37 22.83 0. 38 27 . 17 0 19. 17 0. 37 23 0.38 27 .33 0 19. 33 0.37 23. 17 0.38 27 .5 0 19.5 0. 37 23.33 0.38 27. 67 0 19. 67 0.37 23.5 0.38 27 .83 0 19.83 0. 37 23. 67 0. 38 0 0 20 0. 37 23.83 0.38 0 0 20. 17 0. 37 24 0.21 0 0 20.33 0. 37 24. 17 0.03 0 0 20. 5 0. 37 24 .33 0 0 0 20. 67 0. 38 24.5 0 0 0 20.83 0.38 24. 67 0 0 0 21 0.38 24.83 0 0 0 21. 17 0. 38 25 0 0 - 0 21 .33 0 . 38 25. 17 0 0 0 21 .5 0. 38 25.33 0 0 0 21. 67 0. 38 25.5 0.01 0 0 21.83 0. 38 25.67 0.01 0 0 22 0.38 25.83 0 0 0 22. 17 0. 38 26 0 0 0 PEAK FLOW = 2.82 (CFS) F TLBT ESTATES _3 ` f f 2.5 I II I L n i � ► i f vi ► i i � � � I 0.5 f 5 10 15 )5 3,=} T7i%,1E t:.H0 URS) TALBOT ESTATES BASIN 1 2YR 10/14/91 JOB N0. S11081 ------------------------------ FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 2 24 2.00 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 2.724 86 1 .816 98 6. 3 ------------------------------------------------------ ------------------------------------------------------ 2.724 86 1.816 98 6. 3 ------------------------------------------------------ ------------------------------------------------------ TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0.23 12.33 0. 3 0. 17 0 6. 33 0.24 12. 5 0. 3 0 . 33 0 6. 5 0.24 12. 67 0.28 0.5 0 6. 67 0. 3 12.83 0.25 0 . 67 0 6. 83 0. 36 13 0. 24 0 .83 0 7 0.37 13. 17 0.24 1 0. 01 7 . 17 0.45 13. 33 0. 24 1 . 17 0.01 7 . 33 0 .53 13.5 0.25 1 . 33 0.02 7.5 0.78 13. 67 0.25 1.5 0.02 7. 67 1 .38 13.83 0-.25 1 . 67 0.03 7 .83 1. 39 14 0.25 1 .83 0.04 8 0.87 14. 17 0. 25 2 0.04 8. 17 0. 61 14.33 0. 25 2. 17 0.05 8. 33 0.51 14.5 0.25 2.33 0.05 8.5 0.5 14. 67 0.24 2 .5 0.06 8. 67 0. 43 14. 83 0.22 2. 67 0.07 8. 83 0. 35 15 0.22 2.83 0.08 9 0. 34 15. 17 0.22 3 0.08 9. 17 0. 34 15. 33 0.22 3. 17 0.08_ 9. 33 0. 34 15.5 0. 22 3. 33 0.09 9. 5 0. 34 15. 67 0.22 3.5 0. 09 9. 67 0.35 15.83 0.22 3. 67 0. 1 9.83 0.35 16 0.22 3.83 0. 11 10 0.35 16. 17 0.22 4 0. 11 10. 17 0.35 16. 33 0.22 4. 17 0. 12 10.33 0. 35 16.5 0. 22 4.33 0. 12 10.5 0. 36 16. 67 0.2 4.5 0. 12 10.67 0. 33 16.83 0. 18 4. 67 0. 13 10.83 0. 3 17 0. 18 4.83 0. 15 11 0. 3 17. 17 0. 18 5 0. 15 11 . 17 0.3 17 . 33 0. 18 5. 17 0. 16 11 . 33 0.3 17. 5 0. 18 5. 33 0. 16 11 . 5 0. 3 17. 67 0. 18 5.5 0. 17 11.67 0.3 17.83 0. 18 5.67 0. 19 11.83 0.3 18 0. 18 5.83 0.21 12 0.3 18. 17 0. 18 6 0. 22 12. 17 0.3 18.33 0. 18 1' ,TALBOT ESTATES BASIN 1 2YR 10/14/91 JOB NO. 511081 (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0. 18 22.33 0. 19 26. 17 0 18. 67 0. 18 22.5 0. 19 26.83 0 18.83 0. 18 22. 67, 0. 19 27 0 19 0. 18 22.83 0. 19 27 . 17 0 19. 17 0. 18 23 0. 19 27 . 33 0 19. 33 0. 18 23. 17 0. 19 27.5 0 19.5 0. 18 23. 33 0. 19 27. 67 0 19. 67 0. 18 23.5 0. 19 27. 83 0 19.83 0. 18 23.67 0. 19 0 0 20 0. 18 23.83 0. 19 0 0 20. 17 0. 18 24 0. 1 0 0 20. 33 0. 18 24. 17 0.01 0 0 20.5 0. 18 24. 33 0 0 0 20. 67 0. 18 24. 5 0 0 0 20. 83 0. 18 24.67 0 0 0 21 0. 18 24.83 0 0 0 21 . 17 0. 18 25 0 0 0 21 .33 0. 18 25. 17 0 0 0 21 .5 0. 18 25. 33 0 0 0 21.67 0. 18 25.5 0.01 0 0 21.83 0. 18 25. 67 0.01 0 0 22 0. 18 25.83 0 0 0 22. 17 0. 19 26 0 0 0 ---------------------------------------- ---------------------------------------- PEAK FLOW = 1. 39 (CFS) ---------------------------------------- ---------------------------------------- 1• i TA I BASIN 1 2YR 1.5 I o.� o 0 $ 10 15 20 25 W TIPME (HOURS) f TALBOT ESTATES BASIN 1 10YR 10/15/91 JOB NO. 511081 -------------------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 10 24 2.90 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 2.724 86 1.816 98 6.3 ------------------------------------------------------ ------------------------------------------------------ 2.724 86 1.816 98 6.3 ------------------------------------------------------ ------------------------------------------------------ TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0.42 12.33 0. 49 0. 17 0 6. 33 0. 43 12.5 0. 49 0. 33 0 6. 5 0. 44 12. 67 0. 44 0.5 0 6. 67 0.53 12.83 0.39 0. 67 0. 01 6.83 0. 64 13 0.39 0. 83 0.02 7 0. 67 13. 17 0.39 1 0.03 7. 17 0.79 13.33 0.39 1. 17 0.04 7. 33 0.93 13.5 0.39 1. 33 0.05 7. 5 1.36 13. 67 0.39 1. 5 - 0. 05 7. 67 2. 36 13.83 0.39 1 . 67 0.07 7.83 2. 36 14 0.39 1.83 0.08 8 1.47 14. 17 0. 39 2 0.09 8. 17 1.01 14. 33 0.39 2. 17 0. 09 8. 33 0.85 14. 5 0.39 2.33 0. 1 8.5 0. 63 14. 67 0.37 2.5 0. 1 8. 67 0. 71 14.83 0. 35 2. 67 0. 12 8.83 0. 57 15 0.35 2.83 0. 13 9 0.56 15. 17 0.35 3 0. 14 9. 17 0.56 15. 33 0.35 3. 17 0. 15 9. 33 0. 56 15. 5 0. 35 3. 33 0. 15 9.5 0. 56 15. 67 0.35 3. 5 0. 15 9. 67 0. 57 15.83 0.35 3. 67 0. 17 9.83 0.57 16 0.35 3.83 0. 18 10 0. 57 16. 17 0.35 4 0. 2 10. 17 0.57 16.33 0. 35 4. 17 0.21 10.33 0.57 16.5 0.35 4.33 0.22 10. 5 0. 58 16. 67 0.32 4. 5 0. 23 10.67 0. 53 16.83 0. 29 4. 67 0.25 10.83 0.48 17 0.28 4.83 0.28 11 0.48 17. 17 0.28 5 0.3 11. 17 0.48 17. 33 0.28 5. 17 0. 31 11. 33 0. 48 17. 5 0. 28 5. 33 0. 32 11. 5 0. 48 17. 67 0.28 5. 5 0.33 11. 67 0. 48 17.83 0.28 r ^n ^ nn 1 1 nn /1 An 1 n n nn TALBOT ESTATES BASIN 1 10YR 10/15/91 JOB NO. 511081 ------------------------------------------------------------------------ ------------------------------------------------------------------------ (CONTINUED) TIME FLOW TIME, FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0.28 22. 33 0.29 26. 17 0 18.67 0. 28 22.5 0.29 26.83 0 18.83 0.28 22. 67 0.29 27 0 19 0.28 22.83 0.29 27. 17 0 19. 17 0.28 23 0.29 27. 33 0 19.33 0.28 23. 17 0.29 27. 5 0 19.5 0. 28 23. 33 0.29 27. 67 0 19. 67 0. 28 23.5 0.29 27.83 0 19.83 0. 28 23. 67 0.29 0 0 20 0.29 23.83 0.29 0 0 20. 17 0.29 24 0. 16 0 0 20. 33 0. 29 24. 17 0.02 0 0 20.5 0. 29 24.33 0 0 0 20. 67 0. 29 24.5 0 0 0 20. 83 0.29 24.67 0 0 0 21 0. 29 24.83 0 0 0 21 . 17 0.29 25 0 0 0 21. 33 0. 29 25. 17 0 0 0 21 .5 0. 29 25. 33 0 0 0 21. 67 0.29 25.5 0.01 0 0 21.83 0.29 25. 67 0.01 0 0 22 0. 29 25.83 0 0 0 22. 17 0.29 26 0 0 0 ---------------------------------------- ---------------------------------------- PEAK FLOW = 2.36 (CFS) ---------------------------------------- TALB T ESTATES BASIN 1 10YR if z i 0.5 # # 1 TIME(HOURS) TALBOT ESTATES BASIN 1 100YR 10/15/91 JOB NO. S11081 -------------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 100 24 3.90 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 2.724 86 1.816 98 6.3 2 724 86 1.816 98 6.3 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0.66 12. 33 0. 69 0. 17 0 6.33 0. 67 12.5 0. 69 0.33 0 6. 5 0.68 12. 67 0. 63 0. 5 0.01 6. 67 0.82 12.83 0.56 0. 67 0.03 6.83 0.98 13 0_.55 0.83 0. 05 7 1.02 13. 17 0.55 1 0.06 7. 17 1.2 13. 33 0. 55 1. 17 0.07 7. 33 1.4 13.5 0. 55 1. 33 0.08 7.5 2.04 13. 67 0.55 1.5 0.09 7. 67 3. 51 13.83 0. 55 1. 67 0. 11 7.83 3.48 14 0. 55 1.83 0. 13 8 2. 15 14. 17 0.55 2 0. 14 8. 17 1. 48 14.33 0.56 2. 17 0. 15 8.33 1.23 14. 5 0. 56 2.33 0. 16 8.5 1.21 14. 67 0.53 2. 5 0. 16 8. 67 1.03 14.83 0.49 2. 67 0. 18 8.83 0.83 15 0.49 2.83 0. 2 9 0 .81 15. 17 0.49 3 0.21 9. 17 0.81 15.33 0. 49 3. 17 0.22 9. 33 0. 81 15. 5 0.49 3. 33 0.24 9. 5 0.81 15.67 0.49 3. 5 0.25 9. 67 0.82 15.83 0. 49 3. 67 0.28 9.83 0.82 16 0.49 3.83 0.32 10 0.82 16. 17 0. 49 4 0. 34 10. 17 0. 82 16. 33 0.49 4. 17 0. 35 10. 33 0.82 16.5 0.49 4. 33 0.36 10.5 0.83 16. 67 0. 45 4.5 0.38 10. 67 0.76 16.83 0. 4 4.67 0.42 10.83 0. 69 17 0.4 4.83 0.47 11 0. 68 17. 17 0. 4 5 0.48 11. 17 0.68 17.33 0.4 5. 17 0.5 11.33 0. 68 17. 5 0. 4 5.33 0. 51 11. 5 0. 69 17.67 0.4 5.5 0. 52 11.67 0. 69 17.83 0.4 5. 67 0. 57 11.83 0. 69 18 0.4 5.83 0. 63 12 0. 69 18. 17 0.4 6 0. 65 12. 17 0. 69 18. 33 0.4 f TALBOT ESTATES BASIN 1 100YR 10/15/91 JOB NO. S11081 (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0.4 22. 33 0.4 26. 17 0 18. 67 0. 4 22.5 0.4 26.83 0 18.83 0.4 22. 67 0.4 27 0 19 0. 4 22.83 0. 4 27. 17 0 19. 17 0 . 4 23 0.4 27 . 33 0 19. 33 0.4 23. 17 0.4 27 .5 0 19.5 0. 4 23. 33 0. 4 27 . 67 0 19.67 0. 4 - 23.5 0.4 27.83 0 19. 83 0. 4 23. 67 0.4 0 0 20 0. 4 23.83 0.4 0 0 20. 17 0.4 24 0.22 0 0 20.33 0. 4 24. 17 0.03 0 0 20. 5 0.4 24. 33 0 0 0 20 . 67 0. 4 24.5 0 0 0 20. 83 0.4 24. 67 0 0 0 21 0.4 24.83 0 0 0 21. 17 0.4 25 0 0 0 21 . 33 0.4 25. 17 0 0 0 21. 5 0.4 25. 33 0 0 0 21 . 67 0.4 25. 5 0.01 0 0 21.83 0.4 25. 67 0.01 0 0 22 - 0.4 25.83 0 0 0 22. 17 0.4 26 0 0 0 PEAK FLOW = 3.51 (CFS) BASIN 1 100YR 4 I T { I i { I i f 0 ( I 0 15 ? ) 25 �*1 TIME (HOURS) TALBOT ESTATES ROUTED DET 2YR 10/15/91 JOB NO. 511081 FREQ (YEARS) DURATION (HOURS) PRECIP (INCHES) NOT ROUTED 2 24 2.00 PERVIOUS IMPERVIOUS , TC (MIN) A (AC) CN A (AC) CN 2. 724 86 1.816 98 6. 3 ------------------ ___________________ 2.724 86 1.816 98 6. 3 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0. 16 12. 33 0.33 0. 17 0 6.33 0. 17 12.5 0. 33 0. 33 0 6. 5 0. 18 12. 67 0.33 0.5 0 6. 67 0. 19 12.83 0.32 0. 67 0 6.83 0. 21 13 0_ 32 0.83 0 7 0. 23 13. 17 0. 31 1 0 7. 17 0. 25 13. 33 0. 31 1 . 17 0 7 . 33 0.26 13.5 0. 31 1. 33 0 7.5 0.28 13. 67 0. 3 1 . 5 0.01 7. 67 0. 33 13.83 0.3 1 . 67 0. 01 7.83 0.52 14 0. 3 1. 83 0. 01 8 0. 65 14. 17 0. 3 2 0. 01 8. 17 0. 66 14.33 0.29 2. 17 0.02 8. 33 0. 65 14.5 0.29 2. 33 0.02 8. 5 0. 63 14.67 0.29 2. 5 0.03 8. 67 0. 6 14.83 0.29 2. 67 0.03 8.83 0. 54 15 0.28 2.83 0.04 9 0.49 15. 17 0.28 3 0.04 9. 17 0.45 15. 33. 0. 28 3. 17 0.05 9. 33 0. 42 15.5 0.27 3. 33 0.05 9.5 0.4 15. 67 0.27 3.5 0. 06 9. 67 0. 38 15. 83 0.27 3. 67 0. 06 9.83 0. 37 16 0.26 3.83 0.07 10 0.37 16. 17 0.26 4 0.07 10. 17 0.36 16. 33 0.26 4. 17 0.08 10.33 0.36 16. 5 0.26 4. 33 0.08 10.5 0. 36 16. 67 0.25 4. 5 0. 09 10. 67 0. 35 16.83 0.25 4 . 67 0.09 10.83 0.35 17 0.24 4.83 0. 1 11 0.35 17. 17 0.24 5 0. 1 11 . 17 0. 34 17. 33 0. 23 5. 17 0. 11 11. 33 0. 34 17.5 0.22 5. 33 0. 12 11 . 5 0. 34 17.67 0.22 5.5 0. 12 11. 67 0. 34 17.83 0.21 5. 67 0. 13 11 .83 0. 33 18 0.21 5.83 0. 14 12 0. 33 18. 17 0. 21 ' 6 0. 15 12. 17 0. 33 18.33 0. 2 I TALBOT ESTATES ROUTED DET 2YR 10/15/91 JOB NO. S11081 (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18. 5 0.2 22.33 0. 18 26. 17 0.03 18.67 0.2 22.5 0. 18 26.83 0.02 18.63 0. 19 22.67 0. 18 27 0.02 19 0. 19 22.83 0. 19 27. 17 0.01 19. 17 0. 19 23 0. 19 27 . 33 0.01 19.33 0. 19 23. 17 0. 19 27 .5 0.01 19.5 0. 19 23. 33 0. 19 27. 67 0.01 19.67 0. 19 23.5 0. 19 27.83 0.01 19.83 0. 19 23. 67 0. 19 28 0.01 20 0. 19 23.83 0. 19 28. 17 0. 01 20. 17 0. 18 24 0. 18 28. 33 0.01 20.33 0. 18 24. 17 0. 17 28.5 0.01 20.5 0. 18 24.33 0. 15 26. 67 0 20.67 0. 18 24.5 0. 13 28. 83 0 20.83 0. 18 24. 67 0. 11 29 0.01 21 0. 18 24.83 0. 1 29. 17 0.01 21 . 17 0. 18 25 0.09 29.33 0.01 21 .33 0. 18 25. 17 0.07 29.5 0 21 .5 0. 18 25.33 0.07 29. 67 0 21. 67 0. 18 25.5 0.06 0 0 21 .83 0. 18 25. 67 0.05 0 0 22 - 0. 18 25.83 0.04 0 0 22. 17 0. 18 26 0.04 0 0 PEAK FLOW = 0. 66 (CFS) r C ST ATES ROUTED DET LYR a7 1 0.61 0.5 0.4 � 1 0.3 � 0.2 ` 1 i 0 LIZ i i 5 1() 15 20 7.5 30 TIME (HOURS) TALBOT ESTATES ROUTED DET 10YR 10/15/91 JOB N0. 511081 -------------------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 10 24 2.90 NOT ROUTED PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 2.724 86 1 .816 98 6.3 --------2 724------86--------1 816--- 98 6.3 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0. 27 12. 33 0.49 0. 17 0 6. 33 0.28 12.5 0. 49 0. 33 0 6. 5 0. 29 12. 67 0.48 0.5 0 6. 67 0.3 12.83 0.47 0.67 0 6.83 0. 31 13 0.44 0.83 0 7 0.33 13. 17 0.43 1 0.01 7. 17 0.37 13.33 0.42 1. 17 0.01 7.33 0.51 13.5 0.41 1 .33 0.01 7 .5 0. 65 13.67 0.41 1 .5 0.02 7. 67 0.8 13.83 0. 4 1 . 67 0.02 7.83 0.97 14 0.4 1 .83 0.03 8 1.87 14. 17 0. 4 2 0.04 8. 17 1.21 14.33 0. 39 2. 17 0.04 8.33 1 14.5 0.39 2.33 0.05 8. 5 0. 96 14. 67 0. 39 2.5 0. 06 8. 67 0.94 14.63 0. 38 2. 67 0.06 8.83 0.9 15 0.37 2.83 0. 07 9 0.87 15. 17 0.37 3 0.08 9. 17 0. 83 15. 33 0. 36 3. 17 0.09 9. 33 0.8 15.5 0.36 3.33 0. 1 9. 5 0.77 15.67 0.36 3.5 0. 1 9.67 0.75 15.83 0.35 3. 67 0. 11 9.83 0.73 16 0. 35 3.83 0. 12 10 0.71 16. 17 0.35 4 0. 13 10. 17 0. 69 16.33 0.35 4. 17 0. 14 10. 33 0. 67 16.5 0.35 4.33 0. 15 10.5 0. 66 16.67 0. 35 4.5 0. 16 10.67 0. 65 16.83 0.35 4.67 0. 17 10.83 0. 63 17 0.34 4.83 0. 18 11 0. 6 17. 17 0. 34 5 0. 19 11 . 17 0.57 17. 33 0.34 5. 17 0.21 11.33 0.54 17 .5 0. 33 5. 33 0.22 11 .5 0.53 17. 67 0. 33 5. 5 0.23 11 . 67 0.51 17.83 0. 33 5. 67 0.25 11 . 83 0.5 18 0.33 5.83 0. 26 12 0. 5 18. 17 0. 32 6 0.26 12. 17 0.49 18. 33 0. 32 TALBOT ESTATES ROUTED DET 10YR 10/15/91 JOB NO. 511081 (CONTINUED) TIME FLOW TIME ' FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18.5 0. 32 22. 33 0. 3 26. 17 0.07 18. 67 0.32 22. 5 0.3 26.83 0.04 18.83 0.31 22.67 0.3 27 0.03 19 0.31 22.83 0. 3 27. 17 0.03 19. 17 0.31 23 0.3 27.33 0.03 19. 33 0. 31 23. 17 0.29 27.5 0.02 19.5 0. 31 23. 33 0.29 27.67 0.02 19. 67 0.31 23.5 0.29 27.83 0.02 19.83 0. 3 23. 67 0.29 28 0.01 20 0.3 23.83 0.29 28. 17 0.01 20. 17 0. 3 24 0.29 28. 33 0.01 20. 33 0. 3 24. 17 0. 28 28.5 0.01 20.5 0. 3 24. 33 0.26 28.67 0.01 20. 67 0. 3 24. 5 0.25 28.83 0.01 20.83 0.3 24. 67 0.22 29 0.01 21 0.3 24.83 0. 19 29. 17 0.01 21. 17 0.3 25 0. 17 29.33 0.01 21.33 0. 3 25. 17 0. 15 29.5 0 21 .5 0. 3 25.33 0. 13 29.67 0 21 . 67 0. 3 25.5 0. 11 0 0 21.83 0.3 25. 67 0. 1 0 0 22 0.3 25.83 0.09 0 0 22. 17 0. 3 26 0.07 0 0 PEAK FLOW = 1.87 (CFS) s r LT EST ATIES ROUTED LET O'iTR .ry It 15 L � ; 1.J ' f I � � f � I T IME(HOURS) i TALBOT ESTATES ROUTED DET 100YR 10/15/91 JOB N0. S11081 ---------------------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 100 24 3.90 NOT ROUTED PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 2.724 86 1.816 98 6. 3 2.724 86 1 . 816 98 6. 3 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0.47 12. 33 0.74 0. 17 0 6.33 0.52 12.5 0 .73 0.33 0 6.5 0.56 12. 67 0.72 0. 5 0 6.67 0.61 12.83 0.71 0. 67 0 6.83 0. 65 13 0. 69 0.83 0.01 . 7 0.7 13. 17 0. 67 1 0.01 7. 17 0.75 13. 33 0. 65 1 . 17 0.02 7.33 0.82 13.5 0. 64 1 .33 0.03 7 .5 0.91 13. 67 0. 63 1 .5 0.03 7.67 2.32 13.83 0. 62 1. 67 0.04 7 .83 3.51 14 0. 6 1 .83 0.05 8 2.72 14. 17 0.59 2 0.06 8. 17 1.71 14. 33 0. 58 2. 17 0.07 8.33 1.31 14.5 0 . 57 2.33 0.08 8.5 1.24 14. 67 0.57 2.5 0.09 8.67 1. 15 14.83 0.55 2. 67 0. 1 8.83 0.98 15 0.53 2.83 0. 11 9 0.95 15. 17 0.52 3 0. 13 9. 17 0.94 15. 33 0.51 3. 17 0. 14 9.33 0.92 15. 5 0.51 3.33 0. 15 9.5 0.91 15. 67 0.5 3.5 0. 16 9.67 0.9 15.83 0. 5 3. 67 0. 17 9.83 0.89 16 0.5 3.83 0. 19 10 0.89 16. 17 0.49 4 0.21 10. 17 0.88 16.33 0.49 4. 17 0.22 10. 33 0.87 16.5 0.49 4. 33 0. 24 10.5 0.87 16. 67 0. 49 4.5 0.25 10.67 0.86 16.83 0.47 4. 67 0.26 10.83 0.84 17 0.45 4.83 0.27 11 0.83 17 . 17 0.44 5 0.28 11. 17 0.81 17.33 0.43 5. 17 0.29 11 .33 0.8 17 .5 0.42 5.33 0.3 11 .5 0.78 17.67 0. 41 5.5 0. 32 11. 67 0.77 17.83 0.41 5. 67 0.33 11 .83 0 .76 18 0.41 5.83 0. 34 12 0.75 18. 17 0.41 6 0.39 12. 17 0.74 18.33 0.4 a TALBOT ESTATES ROUTED DET 100YR 10/15/91 JOB NO. 511081 (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) , (CFS) (HOURS) (CFS) 18.5 0.4 22.33 0. 4 26. 17 0. 11 18. 67 0.4 22.5 0.4 26.83 0.06 18.83 0. 4 22. 67 0. 4 27 0.05 19 0 .4 22.83 0.4 27 . 17 0.05 19. 17 0.4 23 0.4 27 . 33 0.04 19. 33 0. 4 23. 17 0.4 27 .5 0.04 19.5 0.4 23. 33 0.4 27 . 67 0.03 19. 67 0. 4 23.5 0.4 27 .83 0.03 19.83 0.4 23. 67 0. 4 28 0.02 20 0.4 23.83 0.4 28. 17 0.02 20. 17 0.4 24 0.38 28.33 0.02 20. 33 0.4 24. 17 0. 34 28.5 0.02 20.5 0. 4 24.33 0. 32 28. 67 0.01 20. 67 0.4 24.5 0-31 28.83 0.01 20.83 0.4 24.67 0.29 29 0.01 21 0.4 24.83 0.27 29. 17 0.01 21 . 17 0.4 25 0.26 29.33 0.01 21 . 33 0.4 25. 17 0.24 29. 5 0.01 21.5 0. 4 25. 33 0.21 29. 67 0.01 21 . 67 0.4 25. 5 0. 18 29.83 0.01 21 .83 0.4 25. 67 0. 16 30 0 22 0.4 25.83 0. 14 30. 17 0 22. 17 0. 4 26 0. 12 0 0 --------- ------- PEAK FLOW = 3.51 (CFS) WAS AeF : 44�p w sti; �'�ij D W L F .% ENGINEERS " e A Division of DOWL, Incorporated l 7 -0% 1� Vf uAL .r BASIN STUDY The City of Renton requested that the basin served by the existing 12-inch cross culvert at Talbot Road (Sta 5+97) be studied to determine the effects of the project on this structure. This cross culvert lies within a few feet of the invert of a sag vertical curve in Talbot Road. The basin flow is conveyed in a shallow ditch, southward along the northbound lane of Talbot Road to the 12-inch cross culvert. The downstream end of the culvert discharges to a broad, rocky, well-vegetated channel leading down to Springbrook Creek. The study provides data on the current and proposed conveyance capacity of the crossing, including discharge velocities and peak headwater stages. Existing and proposed condition hydrographs were prepared using the King County SWM computer program of the Santa Barbara Urban Hydrograph method. Hydrographs for the 2-year, 10-year, and 100-year return intervals were run for both conditions and for the final discharge through the detention system. The predveloped condition hydro's are labeled EXIST1; the developed condition hydro's are BASIN 1 and the routed hydro's are ROUTED DEV. The 4.54 acres draining through the proposed detention pond was omitted from the proposed condition hydrographs. But then the pond discharge values were added to the hydrograph peaks to get a total peak flow rate from the basin. This was done to include the pond detention effects on the total system. The background data and computer printouts enclosed document the procedure used. A 8320 154th Avenue NE • REDMOND, WASHINGTON 96052 • 206 - 869-2670 500 S. 336th St., Suite 201 • FEDERAL WAY, WASHINGTON 98003-638S • 206 - 927-7850 [IN SEATTLE ONLY CALL 682-4771] 9 I summary is found at the end of this section. DOWL ENGINEERS COMPUTATIONS w.o.# Project Name Client Name Sheet of Prepared by: Date Checked by: Date i o c-t R �V T ( ll _ a e. _. 8as ,�1_ I -- 11 3. 3 1 ! ' ------ - I P(Ats Pohd- ois�l,ar- e. � IOO I I i ' I _ .... .......... ... ._ —_— ,— i .. —a_.- 1 ................. ......_ — ............... ._.. .. .......... �-H-h — I I 1 1 DOWL ENGINEERS COMPUTATIONS w•o.# Project Name Client Name Sheet L--.-of Prepared by: Date Checked by: Date 14 A C6hi �n, h�L.T.-. a ! - �, Q a.s n.. Are LM�s a.. 9 51v\.��Qi aNai�� r�s�cC�etia.( (�l ��� i �r-Vlvws) 1 ' S �QS�i� re., i0/�evt� S�'a-ce, C N = _ Z,.,P 5 X 0. Ll 2 /Lla ac a0 r r a t P46-v I OU-s a-c. - 3. ,. r : 1 i 1 _ O Q�✓ O Y ' t row%..j.._Gl a��eo1✓ r�. . _ I _ r , f/ r..:_ _.� X ,Q I t t. , !f- ' U a.1"ea-i s r,�,�a(, 5�.or�' �r�-6 s I i _ ( o — D ! I - _ i ' .. t p T , _ fi ( ! t 1k OOWL ENGINEERS ALASKA TESTLAB COMPUTATIONS W.O.# Project Name Client Name Sheet or Prepared by: Date Checked by: Date OGL-fJ� i I I , _ f = p Vrk , _-2 - -- a-- 2$ 1 - - , s �! 'aT;m e-i- 3. Lmi h t GLIbI 1 V Q-ILke5 VI-43 Kin q' Co. S L./I I w�a� r o2Y ,�- 1nc,k�S j n r 3, 9 ►r,Lha,—s — , . t - : , , , , , � I t _ t DOWL ENGINEERS COMPUTATIONS w.o.# Protect Name Client Name Pry de Corp. Sheet of Prepared by: Date Checked by: Date i To-I U t - sIt ...... - _ 'CO 0vv, __. t►�� _< - _a _ j Q s i►,. A re a /. �(a 7 -� � _. l 0. l �o Q c ►'Pif I - _ ��s r-a�IQ�fs .t$►M vji► � _�eai �,f a'iwik �o �"� Pohu(, l ro►w e, 'i i _ I - ��c� s.l P1 -- 0h P �c�isc,�ctrq t'i va�we6 a.i�� �>✓ -. --- --- u.r-1 C o I a4-i s o vu a�(.y S l S i , rES 1cteK-tia� iht errV� ac r>✓s C _ _ er'v7 o 7.3 Sa m x 0. Liz - . 0 i I VIou-s (Q 6ac - ,3,01ao = 70 / acres � �IM& Q COvtCev� r0 10N a �Q � � � _ .n1:+fit u.��� (ti H G 0w,� ....... L.—�- _ Cxisfi► � _GOt� // h, -- 11 _L .-_. . _ -- -- ——_....... .......--- - i Y , , ---- .......... _:..... ........ .__ -...-....... _ .. - . - — - - _- -- -- _. ......... _.......... ._.__.... ............___ __ ._.__ __ i - _._ ._....- ._ TALBOT ESTATES BASIN STUDY 2-YR 10/16/91 JOB NO. 511081 FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 2 24 2.00 PERVIOUS IMPERVIOUS TC (MIN) A (AC) CN A (AC) CN 11. 600 85 3. 100 98 10 11 . 600 85 3. 100 98 10 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS ) (CFS) 0 0 6. 17 0. 44 12.33 0.86 0 . 17 0 6. 33 0. 47 12. 5 0. 87 0 . 33 0 6. 5 0.49 12. 67 0.81 0.5 0 6. 67 0.59 12.83 0.73 0. 67 0 6.83 0.73 13 0. 71 0.83 0 7 0.8 13. 17 0.7 1 0. 01 7. 17 0. 96 13.33 0.7 1 . 17 0. 02 7. 33 1 . 16 13. 5 0.71, 1.33 0. 02 7 . 5 1 . 69 13. 67 0.71 1. 5 0.03 7. 67 2.98 13.83 0 .71 1. 67 0.04 7 .83 3. 35 14 0.71 1.83 0. 06 8 2. 52 14. 17 0. 71 2 0.07 8. 17 1. 85 14 . 33 0.72 2. 17 0.08 8. 33 1. 5 14. 5 0. 72 2. 33 0. 09 8. 5 1 . 39 14. 67 0. 69 2. 5 0. 09 8. 67 1. . 22 14. 83 0. 65 2. 67 0. 11 8. 83 1.01 15 0. 64 2 .83 0. 12 9 0. 95 15. 17 0. 64 3 0. 13 9. 17 0. 93 15.33 0. 64 3. .17 0. 14 9.33 0. 93 1.5. 5 0. 64 3. 33 0. 15 9. 5 0.94 15. 67 0 . 64 3.5 0. 15 9. 67 0.95 15. 83 0. 64 3. 67 0. 111 9. 63 0. 96 16 0 . 65 3.83 0. 18 10 0.97 16. 17 0. 65 4 0. 1.9 10. 17 0. 97 16. 33 0. 65 4. 17 0. 2 10. 33 0. 98 16. 5 0. 65 4. 33 0. 2 1.0. 5 0. 99 16. 67 0. 61 4. 5 0. 21 10. 67 0. 94 16. 83 0. 55 4. 67 0. 22 10. 83 0.86 17 0. 53 4.83 0. 24 11 0.84 17. 17 0. 53 5 0. 25 11. 17 0.84 17. 33 0. 53 5 . 17 0. 26 11 . 33 0.84 17 . 5 0. 53 5. 33 0. 27 11. 5 0.84 17. 67 0. 53 5. 5 0. 29 11 . 67 0. 85 17 . 83 0.53 5. 67 0. 33 11. 83 0. 85 18 0. 53 5. 83 0. 37 12 0.86 18. 17 0. 53 6 0. 41 12. 17 0.86 18. 33 0. 53 i i f TALBOT ESTATES BASIN STUDY 2-YR 10/16/91 JOB NO. S11081 (CONTINUED) -- TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18. 5 0. 53 22. 33 0. 55 26. 17 0. 03 18. 67 0. 53 22. 5 0.55 26. 83 0.02 18.83 0.53 22. 67 0. 55 27 0.02 19 0. 54 22.83 0. 55 27. 17 0.01 19. 17 0.54 23 0.56 27 . 33 0.01 19. 33 0.54 23. 17 0. 56 27.5 0.01 19.5 0. 54 23. 33 0. 56 27 . 67 0.01 19. 67 0. 54 23.5 0. 56 27 .83 0.01 19.83 0. 54 23. 67 0.56 28 0. 01 20 0.54 23. 83 0.56 28. 17 0.01 20. 17 0. 54 24 0. 37 28. 33 0.01 20-. 33 0. 54 24. 17 0. 12 28.5 0.01 20. 5 0. 54 24. 33 0 28. 67 0 20. 67 0. 54 24.5 0 28.83 0 20. 83 0. 54 24 . 67 0 29 0. 01 21 0. 55 24. 83 0 29. 17 0. 01 21 . 17 0.55 25 0 29. 33 0.01 21 . 33 0. 55 25. 17 0 29.5 0 21 .5 0.55 25. 33 0 29. 67 0 21 . 67 0. 55 25. 5 0. 06 0 0 21.83 0. 55 25. 67 0. 05 0 0 22 0.55 25. 83 0. 04 0 0 22. 17 0.55 26 0.04 0 0 --------------- PEAK FLOW = 3. 35 (CFS) L.. Al T E S T FIASIN STUDY 0.5 � I ' I I I I ti I i f ! ! I f f I � I � ` I i I �} 10 TALBOT ESTATES BASIN STUDY 10-YR 10/16/91 JOB NO_ S11081 FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 10 24 2. 90 PERVIOUS IMPERVIOUS TC (MIN) A (AC_.) CN A (AC) CN 11 . 600 85 3. 100 98 10 ---------------- 11 . 600 85 3. 100 98 10 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0. 98 12. 33 1.46 0. 17 0 6. 33 1.03 12. 5 1. 46 0. 33 0 6. 5 1 . 06 12. 67 1. 36 0 . 5 0 6. 67 1 . 26 1.2. 83 1 . 23 0. 67 0. 01 6.83 1 . 52 13 1. 19 0.83 0.02 7 1 . 65 13. 17 1. 17 1 0.04 7 . 17 1 . 94 13. 33 1. 17 1. 17 0 .06 7. 33 2. 3 13. 5 1. 17 1. 33 0.07 7. 5 3.29 13. 67 1. 18 1. 5 0.08 7. 67 5. 63 13.83 1. 18 1. 67 0. 1 7. 83 6.24 14 1. 18 1 . 83 0. 13 8 4. 62 14. 17 1 . 18 2 0. 14 8. 17 3. 35 14 . 33 1. 19 2 . 17 0. 16 8.33 2. 69 14.5 1 . 19 2.33 0. 17 8. 5 2. 49 14 . 67 1 . 14 2. 5 0. 18 8. 67 2. 16 14.83 1.08 2. 67 0. 2 8.83 1.79 15 1. 06 2.83 0.22 9 1 . 67 15. 17 1. 06 3 0. 23 9. 17 1 . 64 15. 33 1.05 3. 17 0. 24 9. 33 1 . 63 15. 5 1 .06 3.33 0. 25 9. 5 1 . 64 15. 67 1.06 3. 5 0. 26 9. 67 1. 65 15. 83 1.06 3. 67 0.28 9.83 1 . 66 16 1.06 3. 83 0. 3 10 1. 67 16. 17 1 .06 4 0. 32 10. 17 1. 68 16. 33 1 .06 4. 17 0. 34 10.33 1. 69 16.5 1.07 4.33 0. 37 10. 5 1.7 16. 67 1 4. 5 0. 4 10. 67 1 . 6 16. 83 0.9 4. 67 0. 46 10.83 1 . 47 17 0. 87 4. 83 0. 53 11 1 . 43 17 . 17 0.86 5 0. 59 11. 17 1 . 42 17 . 33 0.86 5. 17 0. 63 11.33 1. 42 17. 5 0.86 5. 33 0. 67 11. 5 1.43 17. 67 0.86 5. 5 0.71 11 . 67 1.43 17. 83 0.86 5. 67 0 .78 11.83 1 . 44 18 0.86 5.83 0.88 12 1 . 44 18. 17 0.86 6 0. 94 12. 17 1 . 45 16.33 0.86 TALBOT ESTATES BASIN STUDY 10-YR 10/16/91 JOB NO_ S11081 ------------------------------------------------------ (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18 . 5 0. 87 22. 33 0.89 26. 17 0. 03 18. 617 0.87 22.5 0. 89 26.83 0.02 18.83 0. 87 22. 67 0.89 27 0. 02 19 0. 87 22. 83 0.89 27 . 17 0.01 19. 17 0.87 23 0.89 27. 33 0.01 19.33 0.87 23. 17 0.89 27 . 5 0.01 19. 5 0. 87 23. 33 0.89 27. 67 0. 01 19. 67 0. 87 23. 5 0.89 27 .83 0.01 19.83 0.87 23. 67 0. 89 28 0.01 20 0.87 23. 83 0.89 28. 17 0.0.1 20. 17 0.88 24 0. 6 28. 33 0.01 20. 33 0.88 24. 17 0. 2 28.5 0.01 20. 5 0.88 24. 33 0 28. 67 0 20. 67 0. 88 24.5 0 28. 83 0 20.83 0. 88 24. 67 0 29 0.01 21 0.88 24.83 0 29. 17 0.01 21 . 17 0. 88 25 0 29. 33 0.01 21. 33 0.88 25. 17 0 29. 5 0 21 . 5 0.88 25. 33 0 29. 67 0 21 . 67 0. 88 25. 5 0.06 0 0 21 . 83 0. 88 25. 67 0.05 0 0 22 0.88 25. 83 0. 04 0 0 22. 17 0.89 26 0.04 0 0 PEAK FLOW = 6.24 (CFS) La BASIN STUDY 7 , I ! ) I TIME toll 0UR S� - TALBOT ESTATES BASIN STUDY 1.00-YEA 10/16/91 JOB NO. 91057C ------------------------------------------ FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 100 24 3. 90 PERVIOUS IMPERVIOUS TC (MIN) PEAK FLOW A (AC) CN A (AC) CN ( CFS) .11 - 600 85 3. 100 98 10 0 0. 000 86 0.000 0 0.000 86 0.000 0 11 - 600 85 3. 100 98 10 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 1 . 69 12. 33 2. 12 0. 17 0 6. 33 1. 75 12. 5 2. 13 0. 33 0 6. 5 1 . 8 12. 67 1 .98 0 .5 0.01 6. 67 2. 11 12. 83 1 . 79 0. 67 0. 04 6.83 2. 52 13 1.73 0. 83 0.07 7 2.71 1.3. 17 1 .71 1 0.09 7. 17 3. 16 13. 33 1 .7 1 . 17 0. 12 7. 33 3.72 13. 5 1 .7 1. 33 0 . 14 7. 5 5. 24 13. 67 1.71 1 . 5 0. 15 7. 67 8. 85 13.83 1 . 71 1 . 67 0. 18 7.83 9. 71 .14 1 . 71 1. . 83 0. 22 8 7 . 12 14 . 17 1 . 71 2 0. 24 8. 17 5. 13 1.4. 33 1 .72 2. 17 0. 25 8.33 4.09 .14.5 1.72 2. 33 0. 26 8. 5 3. 77 14. 67 1 . 65 2. 5 0. 27 8. 67 3. 26 14.83 1 . 56 2. 67 0. 3 8.83 2. 69 15 1 . 53 2. 83 0. 34 9 2. 51 15. 17 1 . 52 3 0. 35 9- 17 2. 45 15.33 1. . 52 3. 17 0. 36 9.33 2. 44 15. 5 1 . 52 3. 33 0. 39 9. 5 2. 45 15. 67 1 .52 3. 5 0. 43 9. 67 2. 46 15 .83 1. 52 3. 67 0. 5 9.83 2. 47 16 1 . 53 3.83 0. 59 10 2. 48 16. 17 1 . 53 4 0. 65 10 . 17 2. 49 16. 33 1.53 4. 17 0. 71 10. 33 2. 5 16. 5 1. 53 4. 33 0.76 10. 5 2. 51 16. 67 1.. 43 4. 5 0.81 10. 67 2. 37 16. 83 1 . 3 4. 67 0. 91 10. 83 2. 17 17 1 . 25 4. 83 1 . 03 11 2. 11 .17 . 17 1 . 24 5 1. . 11 11. 17 2.09 .1.7 . 33 1. . 23 5. 17 1 . 17 11. 33 2.09 1.7 . 5 1 . 23 5. 33 1 .22 11 . 5 2.09 1.7. 67 1 .23 5. 5 1. 27 11. 67 2. 1 17.83 1. 23 5. 67 1. 4 11.83 2. 11 18 1. 23 5. 83 1 . 54 12 2. 1.1 18. 17 1. . 24 6 1. 63 12. 1.7 2. 12 18.33 1. 24 TALBOT ESTATES BASIN STUDY 100-YEA 10/16/91 JOB NO. 91057C ------------------------------------------- (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18. 5 1 . 24 22. 33 1. . 26 26. 17 0 18. 67 1 . 24 22. 5 1 .26 26.83 0 18.83 1 . 24 22. 67 1 . 26 27 0 19 1. 24 22.83 1 . 26 27. 17 0 19. 17 1 .24 23 1 .26 27 . 33 0 19. 33 1 . 24 23. 17 1 .26 27.5 0 19. 5 1 . 24 23. 33 1 .26 27 . 67 0 19. 67 1 . 24 23. 5 1 . 26 27.83 0 19. 83 1 . 25 23. 67 1 .26 0 0 20 1 .25 23. 83 1 . 26 0 0 20. 17 1 . 25 24 0.84 0 0 20. 33 1 . 25 24. 17 0. 28 0 0 20. 5 1 . 25 24. 33 0 0 0 20. 67 1.25 24 .5 0 0 0 20.83 1 .25 24 . 67 0 0 0 21 1.25 24. 83 0 0 0 21 . 17 1 . 25 25 0 0 0 21 . 33 1.25 25. 17 0 0 0 21 .5 1 .25 25. 33 0 0 0 21 . 67 1 .25 25.5 0 0 0 21 .83 1 .26 25. 67 0 0 0 22 1 .26 25.83 0 0 0 22. 17 1 . 26 26 0 0 0 ---------------------------------------- PEAK FLOW = 9.71 (CFS) ---------------------------------------- ---------------------------------------- Tf7- I BASIN STUD"-Lr 100-YEAR 9 71 IT. .v le 11TIVIE TALBOT ESTATES BASIN STUDY PROPOSED 2-YR 10/16/91 JOB NO. 91057C ----------------------------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 2 24 2. 00 PERVIOUS IMPERVIOUS TC (MIN) PEAK FLOW A (AC) CN A (AC) CN (CFS) 7. 100 85 3. 100 98 10 0 0.000 86 0.000 0 0.000 86 0.000 0 --------------------------- 7. 100 85 3. 100 98 10 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0. 39 12. 33 0. 63 0. 17 0 6. 33 0. 41 12. 5 0. 63 0. 33 0 6. 5 0. 43 12. 67 0. 59 0 . 5 0 6. 67 0. 51 12 . 83 0.54 0. 67, 0 6.83 0. 61 13 0. 52 0.83 0 7 0. 67 13. 17 0.51 1 0.0.1 7. 17 0.79 13. 33 0.51 1 . 17 0. 02 7. 33 0. 94 13. 5 0. 51 1 .33 0.02 7 . 5 1 . 35 13. 67 0. 51 1 . 5 0.03 7. 67 2. 33 13.83 0.52 1. 67 0.04 7. 83 2. 6 14 0. 52 1 . 83 0.06 8 1.93 14. 17 0. 52 2 0.07 8. 17 1.41 14. 33 0. 52 2 . 17 0.08 8.33 1 . 13 14. 5 0. 52 2. 33 0.09 8. 5 1 . 05 14. 67 0. 5 2.5 0.09 8. 67 0.92 14.83 0. 47 2.67 0. 1.1 8.83 0.76 15 0. 47 2.83 0. 12 9 0.71 15. 17 0. 46 3 0. 13 9. 17 0.7 15. 33 0. 46 3. 17 0. 14 9. 33 0.7 15. 5 0. 46 3. 33 0. 15 9. 5 0.7 15 . 67 0. 47 3. 5 0. 15 9. 67 0.71 15.83 0. 47 3. 67 0. 17 9.83 0.71 16 0. 47 3. 83 0. 18 10 0. 72 1.6. 17 0. 47 4 0. 19 10. 17 0.72 16. 33 0. 47 4. 17 0.2 10. 33 0.73 16. 5 0. 47 4. 33 0. 2 10. 5 0.73 16. 67 0. 44 4. 5 0.21 10. 67 0. 69 16.83 0. 4 4. 67 0.22 10.83 0. 64 17 0.39 4.83 0. 24 11 0. 62 1.7. 17 0. 38 5 0.25 11. 17 0. 62 17.33 0. 38 5. 17 0.26 11. 33 0. 62 1.7. 5 0. 38 5. 33 0. 26 11. 5 0. 62 17. 67 0. 38 5. 5 0. 28 11. 67 0 . 62 17.83 0. 38 5. 67 0. 31 11. 83 0. 62 18 0. 38 5. 83 0. 35 12 0. 63 18. 17 0. 38 6 0. 37 12. 17 0. 63 1.8. 33 0. 38 TALBOT ESTATES STUDY PROPOSED 10/16/91 JOB NO. 91057C ------------------------------------------- (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18. 5 0. 38 22. 33 0.4 26. 17 0 18. 67 0.38 22. 5 0. 4 26.83 0 18.83 0. 38 22. 67 0. 4 27 0 19 0. 39 22. 83 0. 4 27 . 17 0 19. 17 0. 39 23 0.4 27 . 33 0 19. 33 0. 39 23. 17 0. 4 27 .5 0 19. 5 0. 39 23. 33 0. 4 27. 67 0 19. 67 0. 39 23. 5 0 . 4 27 . 83 0 19.83 0. 39 23. 67 0. 4 0 0 20 0. 39 23.83 0. 4 0 0 20. 17 0. 39 24 0.27 0 0 20. 33 0. 39 24. 17 0.09 0 0 20. 5 0. 39 24. 33 0 0 0 20. 67 0. 39 24.5 0 0 0 20 .83 0. 39 24. 67 0 0 0 21 0. 39 24.83 0 0 0 21 . 17 0. 39 25 0 0 0 2.1 . 33 0. 39 25. 17 0 0 0 21 . 5 0 .39 25. 33 0 0 0 21 . 67 0. 39 25.5 0 0 0 21 . 83 0. 39 25. 67 0 0 0 22. 0 . 39 25.83 0 0 0 22. 17 0. 4 26 0 0 0 ---------------------------------------- PEAK FLOW = 2. 60 (CFS) ----------------------------------------- ---------------------------------------- '3TUDYPFROPOSED 3 2.5 U1.5 IV 9d -------------------------------- TIME (HRS) TALBOT ESTATES BASIN STUDY PROPOSED 10YR 10/16/91 JOB N0. 91057C -------------------------------------------------- FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 10 24 2. 90 PERVIOUS IMPERVIOUS TC (MIN) PEAK FLOW A (AC) CN A (AC) CN (CFS) 7. 100 85 3. 100 98 10 0 0.000 86 0.000 0 0.000 86 0.000 0 - ----------------------- 7. 100 85 3. 100 98 10 TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 0.79 12.33 1.04 0. 17 0 6. 33 0. 82 12. 5 1.04 0. 33 0 6. 5 0.84 12. 67 0.97 0.5 • 0 6. 67 0.99 12. 83 0.88 0. 67 0. 01 6.83 1 . 18 13 0. 85 0. 83 0.02 7 1 . 27 13. 17 0. 84 1 0 .04 7. 17 1 . 49 13.33 0.84 1 . 17 0.06 7 . 33 1.75 13. 5 0.84 1 . 33 0. 07 7. 5 2. 48 13. 67 0.84 1 . 5 0.08 7. 67 4 . 2 13. 83 0. 84 1. 67 0. 1 7.83 4. 63 14 0.84 1..83 0. 13 8 3. 41 14. 17 0. 84 2 0. 14 8. 17 2. 46 14. 33 0.85 2. 17 0. 16 8. 33 1 .97 14.5 0.85 2. 33 0. 17 8.5 1 . 81 14. 67 0. 81 2. 5 0. 18 8. 67 1 . 57 14.83 0.77 2. 67 0. 2 8.83 1 . 3 15 0.75 2.83 0.22 9 1. 21 15. 17 0.75 3 0. 23 9. 17 1 . 19 15. 33 0.75 3. 17 0. 24 9.33 1 . 18 15. 5 0. 75 3. 33 0. 25 9. 5 1. 19 15. 67 0.75 3. 5 0. 26 9. 67 1 . 19 15.83 0. 75 3. 67 0.28 9.83 1 . 2 16 0.75 3. 83 0.3 10 1.21 16. 17 0. 76 4 0. 32 10. 17 1.21 16. 33 0. 76 4. 1.7 0. 33 10. 33 1 .22 16.5 0.76 4.33 0. 35 10. 5 1 .22 16. 67 0.71 4. 5 0. 37 10. 67 1 . 16 16.83 0. 64 4. 67 0.42 10.83 1.06 17 0. 62 4.83 0. 48 11 1. 03 17 . 17 0. 61 5 0. 51 11 . 17 1 .02 17.33 0. 61 5. 17 0. 54 11 . 33 1 .02 17 . 5 0. 61 5. 33 0. 57 11 . 5 1.02 17 .67 0. 61 5.5 0 . 59 11. 67 1 . 03 17. 83 0. 61 5. 67 0. 65 11.83 1.03 18 0 . 61 5.83 0. 72 12 1 .03 18. 17 0. 61 6 0.76 12. 17 1 .04 18.33 0. 61 TALBOT ESTATES STUDY PROPOSED 10/16/91 JOB NO. 91057C ----------------------------------------------- (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18. 5 0. 61 22. 33 0. 63 26. 17 0 18. 67 0. 61 22.5 0. 63 26. 83 0 18.83 0. 61 22. 67 0. 63 27 0 19 0. 62 22.83 0. 63 27. 17 0 19. 17 0. 62 23 0. 63 27. 33 0 19. 33 0. 62 23. 17 0. 63 27 . 5 0 19. 5 0 . 62 23. 33 0. 63 27 . 67 0 19. 67 0. 62 23.5 0. 63 27 . 83 0 19.83 0. 62 23. 67 0. 63 0 0 20 0. 62 23.83 0 . 63 0 0 20. 17 0. 62 24 0. 42 0 0 20. 33 0 . 62 24. 17 0. 14 0 0 20.5 0. 62 24. 33 0 0 0 20. 67 0. 62 24.5 0 0 0 20.83 0. 62 24. 67 0 0 0 21 0. 62 24.83 0 0 0 21. 17 0. 62 25 0 0 0 21 . 33 0. 62 25. 17 0 0 0 21 . 5 0. 62 25. 33 0 0 0 21 .67 0. 62 25.5 0 0 0 21 .83 0. 62 25. 67 0 0 0 22 0. 63 25.83 0 0 0 22. 17 0. 63 26 0 0 0 ---------------------------------------- ---------------------------------------- PEAK FLOW = 4. 63 (CFS) ----------------------------------------- ---------------------------------------- TALBOT F-7 SIFUDY PRC)POSED I * + I 77 -Av TALBOT ESTATES BASIN STUDY PROP. 100-YR 10/16/91 JOB NO. 91057C - ------------------------------------------------ FREQ (YEARS) DURATION (HOURS) PRECIP ( INCHES) 1.00 24 3. 90 PERVIOUS IMPERVIOUS TC (MIN) PEAK FLOW A (AC) CN A (AC) CN (CFS) 7 . 100 85 3. 100 98 10 0 0.000 86 0. 000 0 0 .000 86 0.000 0 ------------ 7 . 100 85 3. 100 98 10 ----------------------------------------------------------------- ---------------------------------------------------------------- TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 0 0 6. 17 1. 3 12. 33 1. 5 0. 17 0 6. 33 1.33 12. 5 1 . 5 0. 33 0 6. 5 1 . 36 12. 67 1. 4 0. 5 0.01 6. 67 1. 59 12.83 1. 27 0 . 67 0.04 6.83 1 . 89 13 1 .22 0.83 0.07 7 2.02 13. 17 1.21 1. 0.09 7. 17 2. 35 13. 33 1 . 2 1 . 17 0. 12 7. 33 2.75 13.5 1 . 2 1 . 33 0. 14 7 . 5 3.85 13. 67 1. 21 1 . 5 0. 15 7 . 67 6. 45 13. 83 1 . 2.1 1. 67 0. 18 7. 83 7.04 14 1 . 21 1 .83 0. 22 8 5. 15 14. 17 1. 21 2 0.24 8. 17 3. 7 14. 33 1. 21 2. 17 0.25 8.33 2.94 14. 5 1 . 21 2. 33 0. 26 8. 5 2.7 14. 67 1. 17 2. 5 0. 27 8. 67 2. 34 14 .83 1- 1 1- 2. 67 0. 3 8. 83 1 .92 .15 1.08 2 .83 0. 34 9 1.79 15. 17 1 .07 3 0. 35 9. 17 1.75 15. 33 1. 07 3. 17 0. 36 9. 33 1.74 15. 5 1-07 3. 33 0. 38 9. 5 1 .75 15. 67 1 .07 3. 5 0. 41. 9. 67 1 . 75 15.83 1.07 3. 67 0. 46 9. 83 1.76 1.6 1 .08 3.83 0. 53 10 1.77 16. 1.7 1 .08 4 0. 57 10. 17 1.77 16. 33 1.08 4. 17 0 . 61 10.33 1.78 16.5 1.06 4. 33 0. 65 10. 5 1 .78 16. 67 1. 01 4. 5 0. 68 1.0. 67 1 . 68 16.83 0.91 4. 67 0.75 10.83 1 .54 17 0.88 4. 83 0.84 11 1. 5 17. 17 0. 87 5 0.89 11. 17 1 . 49 17 .33 0. 87 5. 17 0. 93 11. 33 1 . 48 17. 5 0.87 5. 33 0.97 11 . 5 1 . 49 17. 67 0.87 5. 5 1 11 . 67 1 . 49 17 .83 0. 87 5. 67 1 .09 11.83 1 . 49 18 0. 87 5.83 1 . 19 12 1 . 49 18. 17 0.87 6 1 . 25 12. 17 1.5 18.33 0. 87 TALBOT ESTATES STUDY PROP_ lilt)-YR 10/16/91 JOB NO- 91057C -------------------- (CONTINUED) TIME FLOW TIME FLOW TIME FLOW (HOURS) (CFS) (HOURS) (CFS) (HOURS) (CFS) 18. 5 0. 87 22. 33 0.88 26. 17 0 18. 67 0.87 22. 5 0.88 26.83 0 18.83 0.87 22. 67 0. 88 27 0 19 0.87 22.83 0.88 27. 17 0 19. 17 0.87 23 0. 89 27. 33 0 19.33 0.87 23. 17 0.89 27 .5 0 19.5 0.87 23. 33 0. 89 27 . 67 0 19. 67 0. 87 23.5 0.89 27 . 83 0 19.83 0. 88 23. 67 0. 89 0 0 20 0.88 23.83 0.89 0 0 20. 1.7 0.88 24 0. 59 0 0 20.33 0.88 24. 17 0. 2 0 0 20 . 5 0.88 24. 33 0 0 0 20. 67 0. 88 24. 5 0 0 0 20. 83 0. 88 24. 67 0 0 0 21 0. 68 24 .83 0 0 0 21 . 17 0.88 25 0 0 0 21 . 33 0.88 25. 17 0 0 0 21 .5 0.88 25. 33 0 0 0 21 . 67 0.88 25. 5 0 0 0 21 .83 0. 88 25. 67 0 0 0 22 0.88 25.83 0 0 0 22. 17 0.88 26 0 0 0 ---------------------------------------- PEAK FLOW = 7 .04 (CFS) ---------------------------------------- ---------------------------------------- -r A I Q t-\-r C -r A -r F-C% SJUD'i PRI"-)P. 10()-YR S rU Tll TIME (HIRS) PROJECT:_(al dot 0 V r- STor-m r� DESIGNER: DATE: HYDROLOGIC AND CHANNEL INFORMATION 5C cLt-c-ue- IoL✓poiil SKETCH a-fi Sta. 5+813 STATION : 5 D = Diameter or Height EL./09.8 F-11D B = Span B � AHW=�. � I ��ee.�l wing 01 = 6. �H /D y rr P t•� T WI = 02 — y 10 �ost TW2 — EL._ S 7 f�� TW L = yz EL.(06.5 01 = DESIGN DISCHARGE SAY 025 MEAN STREAM VELOCITY= 02 = CHECK DISCHARGE , SAY 0S0 OR 01Do } MAX. STREAM VELOCITY= LSOQ—Z CULVERT SIZE HEADWATER COMPUTATION i DESCRIPTION 0 INLET CONTROL OUTLET CONTROL HW=H +DTW-LSO 0 _ -j 0 COST COMMENTS ENTRANCE TYPE) D B B p HW Ke H do � TW DTW LS° HW o o; p 2 U Lxist-IL ��( 12 " Iz 3d15 3j5- 5- 2.6 i�rt � Floods Ao cD 0 Pi0^ns KJ.�� '-1 ��J I•Q3 I,�U ,J� •� l� �.2� — 0.�� .Z� �e� 3a� {� �d C' VJV6L t n - C CD n SUMMARY a RECOMMENDATIONS: n No TcJ-G,)a-rcr o(ue- to st,ey c�G, le.aOtIh cL�-lvel_t h e o�Q � � rI I� ze5-fit a�0v� f�� �X�st;h�d;�-��, -�����(s Ta(�ot f0.ilS o- c, =O Design by Checked by Approved by r� f, -� O l ,SOT Cs rC� tc s I Ll oLt •KI'NG COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3.5C HEADWATER DEPTH FOR SMOOTH INTERIOR PIPE CULVERTS WITH INLET CONTROL Ex►stil� C��� a l oAot Rod Cross C (-fi 180 10,000 1 0—y r 1 10k' 168 8,000 EXAMPLE �� (2) (3) ENTRANCE TYPE I56 6,000 0•42 incnel (3.5 h - 6. at) 6_ 144 5,000 °•120`'' 5 SQUARE EDGE WITH 4,000 �• Mw 6• 5. HEADWALL 132 ° teat �. 3,000 S. 4. 4. 120 (2) 2.1 7.4 I 12,000 _ t (3) 7 108 _ 2.2 .7 4 3. I i 'o in hat , 3• 96 3 I 3 PLAN 1,000 800 GROOVE END WITH 84 . __. HEADWALL - 600 / 2• 2.-" 500 l ` 72 400 !/ 2. I i = 300 1.5 Ucn Z to Z 60 vix 200 i H 1.5 PLAN o 54 GROOVEEND a a PROJECTING li w 48 !�0 100 Z J > cc 80 v /2 u 60 a I.0 I.0 ... 4. U- N_ 50 W i 0 o HW SC LE ENTRANCE 1.0 �� 40 D TYPE w 36 W .9 3 f �- 9 W 30 ) sgoore edge with Q hood.all 3 .9 33 a c � 20 (2) Groove ene with W 30 hood■all = .8 .8 (3) Groove and 8 27 projecting I 24 8 7 7 7_ 6 To use scale (2) or (3) project 2 I 5 horizontally to scale(Il,ihon 4 use stralght inclined lint through 0 and 0 scalss,or reverse as 6 3 illustrated. 6 .6 18 2 15 1. .5 .5 1.0 S-_ — 12 4.35-11 1/90 IaI�oT �- s To- re- s I uc-r ' I ILk • KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3.5E HEAD FOR CULVERTS (PIPE W/'In" =0.012), FLOWING FULL WITH OUTLET CONTROL I0 yr- Flog,./ Cxisfiio ConJ, TaAof Roa)- Cross iti �_ 2000 N NWI _ he u .4 = W S ow tove S 1000 ; J SUBMERGED OUTLET CULVERT FLOWING FULL 5 F NW N♦no—LSo 800 120 For outlet crow not submerged,canputs NW Or .6 methods described in the design procedure 600 108 8 500 96 H.Oq� 1.0 400 84 300 / 72 � 66 MP`E/ho f ►- 200 60 E� \00 �'i W 2 to / ry U. U. 5 4 / / Z to 0-48 _ L-110 00 i W 48-- ►�O.S 3 100 Z p0 Z to Q W ��0 / 42 00 '� W 4 80%� _ ac _ 3 6 y60 h00 5 N 60 5 0 H 33 .-00 �00 6 W 30 40 Q 500 f 8 c 2 7 • •' O 0 :-10 30 24 20 21 18 120 10 15 8 6 12 5 4 4.3.5-13 1/90 •KI'NG. COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.35C HEADWATER DEPTH FOR SMOOTH INTERIOR PIPE CULVERTS WITH INLET CONTROL JFi'veloped Covij, Pro�oseJ Rd(,ot' foal Cross CtA-1ver k 180 10,000 I 0 —1 r �/o 168 8,000 EXAMPLE ENTRANCE TYPE 6. 156 6,000 o••z inch.. (3.s t..I) 6_ SQUARE EDGE WITH 5,000 0.120 cfs — 5 144 HEADWALL 4.000 �• Itw 6 5. 132 D feet 3,000 4. (1) 2.3 e.e 5' 4. 120 ' 2,000 (3) 2.2 7.7 108 4. 3. I •0 in feet 3' 96 PLAN ,000 3 I GROOVE END WITH Boo HEADWALL 84 - 600 2. -_.. 2:._. 500 ' 72 400 i/ 2. I I I 1 � U_ i to N 60 V 200 i UJ 1.5 PLAN Z - GROOVEEND 0 54 a PROJECTING 0 0 _ ~ � 100 z W > 48 Cr 80 = �. v / u 60 a. 1.0 1.0 --A 42 w U_ 0 50 HW SCALE ENTRANCE a 10 ' m 40 D TYPE W t- 36 30 (1) situate adg"if ; 9 9 9 `JI nead.yll _ a 33 / a O 20 (2) Gf"i and..In 30 headwall = .8 .8 13� Groove and .8 2 T projecting 10 - 24 8 .T 6 To we scale 12)or (3) project 21 5 horizontally to scale(1),then 4 usa straight inclined line through D and 0 scales,or reverse as 6 3 illustrated, 6 .6 18 2 15 1.0 • .5 5 .5 12 4.35-11 1/90 0.I o S /ct uc I KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3.5E HEAD FOR CULVERTS (PIPE W/"n" =0.012), FLOWING FULL WITH OUTLET CONTROL 0 yr Tlokl'/ Pro CComotlf o�t To loot RJal Cross i,1 2000 N , HWI — he = W Stop. Sc_. 1000 = SUBMERGED OUTLET CULVERT FLOWING FULL J NW.N4 ho—LSO .5 800 120 For outlet crowe not twpmeraee,compute NW by 6 method. Describes M the deuan procedure 600 108 .8 500 96 400 84 300 / 72 66 200 60 W 2 U. 54 Z W 48 D-46 C L.11 O g,00 ti i 3 100 2 42 O '00 07Fj. 1 a JJ W 4 ox 80/ _ 3 6 '00 A00 5 (4 60 c 5 0 FW- 33 A00 J00 6 W 30 40 Q ej00 t 8 0 2 7 . O 30 O N 10 /14 `r 20 120 10 15 g 12 5 4 4.3.5.13 1/90 1KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3SG CRITICAL DEPTH OF FLOW FOR CIRCULAR CULVERTS 120 3,000 099 114 108 2,000 102 96 4000 90 94 0.90 500 / T8 400 O.AO 72 300 200 a70 60 \` �_ ` 0.60 —54 W \` 4a 1 50 \ Q ow s 40 _ v � c 30 Z. 42 " _ o � 20 ou �+ 0.40 36 / a c � c 33 2 / � 3 = 1.0 —30 5 gA D a3o 4 27 v 3 A do 24 5 2 0 T 21 I Note: For all cross-sectional shapes, dccan be calculated by ago 18s trial and error knowing that the k quantity (02 T/gA3)=1.0 at critical depth. Is EXAMPLE D = 66 inches, 0 = 100cfs d2D - Ratio =0.50 12 d,_ (0.50)(66 inches) = 33 inches + (12 inches/ft) dc=2.75 feet _ 4.3.5-15 1/90 0-- le 3 PROJECT: 10 J� 11t ESt0.rcS //J 0 y r Storm DESIGNER: 1 DATE: HYDROLOGIC AND CHANNEL INFORMATION Su � Cu-'`VQ SKETCH _ Spa. +j0 STATION : t D = Diameter or Height EL. l09.S F-11D �p B = Span I B'1 AHW=1•S9 lowly 01 = 9,70 IOOyr Pry TWI =n c t � � TW O 02 — I�JOyr Post TW2 = SO=0.035F'/r T EL.�OO,�r L = va EL.yob. T — 01 = DESIGN DISCHARGE , SAY 025 1 MEAN STREAM VELOCITY= Q2= CHECK DISCHARGE , SAY QSO OR 0100 f MAX. STREAM VELOCITY= LSO�•a CULVERT s1zE HEADWATER COMPUTATION z r DESCRIPTION Q INLET CONTROL OUTLET CONTROL HW=H +DTW-LSO 0 _ _jo COST COMMENTS ENTRANCE rraE1 p g B D HW Ke H dC 'C+� TW DTW LSO HW o o; 0 ` 2 / Q � �xlSl IF1 I•�O ��.. I�.- 60� � J � �.� / / O V � �.� let �2. ��� �'"fiJ,�O15 !�J CD CD —^ Pro1)osbol, 10 I N �a �a� ,� /0 3 i.z3 1,3C 0 0 zl /�� iet 5.s ±%� !8''ec�u,Iva(ek 0 n c CD SUMMARY a v - SUMMARY a RECOMMENDATIONS: n E<5 1K� SyS�e,.ti, =1 hoo�s I al��� JZoao�a 0(u.riilq i�J0-yr Sto1 - t 0 Design by Checked by Approved by T + � czl (3ol : 5 is IC-S / �C KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3.5E HEAD FOR CULVERTS (PIPE W/"n" =0.012), FLOWING FULL WITH OUTLET CONTROL ^� / 00yr NL✓ Cxi5t)Hq_Covdo To- of � oao, Cro55 Cu- i/c4--�' 2000 " 1 NO = W S... So--. 1000 J SUSMERGEO OUTLET CULVERT FLOWING FULL r> f NW.N.ho—LSO 800 120 For eurlel MOM Per submerged.compute NW by 6 mHAOes aver-eed N fine deslpo procedure 600 108 .8 500 96 �. 1.0 400 84 300 72 6 6 200 60 w 2 ui of / `p Cry U. U. 5 4 / u i z O 100 2 4 po �j a 80 10 -- 4 2 App b W 4 _ _ _ 3 6 +�Op App 5 N 60 cr H 3 3 App App 6 5 O W 3 0 40 Q bpp�f��r- 8 0 27 •� O 30 24 �/�� --� o '� 10 20 21-18 20 15 8 6 12 5 4 4.3.5-13 1/90 I ar 0,-) 1 G5IRIe. r ..6c.i ( • KI-NG COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3SC HEADWATER DEPTH FOR SMOOTH INTERIOR PIPE CULVERTS WITH INLET CONTROL 100yr �I�w �x sfivl � C�v�c�. lal�of �,oak Cross CtOvert ISO 10,000 168 8,000 EXAMPLE (1) (2) (3) ENTRANCE TYPE 6. 156 6,000 0•42 into.• (3.5 feet) 6_ SQUARE EDGE WITH 5.000 0.120 cts - 5 144 HEADWALL 4,000 �. nw 6. 5. 132 0 lost 3,000 5. 4 (1) 2.5 8.8 4. 120 ' (2) 2.1 TA 108 2.000 (3) 2.2 7.7 4.- 3 1 e0 in fall 3' 96 1,000 3 PLAN 800 / GROOVE END WITH r -. HEADWALL 4 - 600 / 2. - -2. .: 500 1 72 400 i/ 2. 1 I 1 1 1 � = 300 /P!!i = 1.5 1.5 Z to � = 60 U 200 i W 1.514.1 PLAN c 2 GROOVEEND 54 a PROJECTING w 48 !�W� 100 0 Z > 80 60 a 1.0 1.0 v :'42 W 0 - 50 HW SCALE ENTRANCE 1.0 cc Cr TYPE W UJI 9 )- 36 30 (1) Sguor•odge with 3 .9 9 W 33 headwall Q Q Q 20 (2) Groove,sod with W 30 hoodwoll = .8 .8 (3) Groove and 9 27 projecting 10 .7 7- /15 8 .7 6 To use scale (2) or (3) project 5 horizontally to scale(1),then 4 use straight inclined line through 0 and 0 scales,or reverse as 6 3 illustrated. 6 .6 11.0 .55 .5 4.35-11 1/90 o- I b oT C sTa.7 e,�5 '-') LJG' I I -KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3.5E HEAD FOR CULVERTS (PIPE W/"n" =0.012), FLOWING FULL WITH OUTLET CONTROL I00rr low Oeveloped Cove,, 7"a (� O� 9�OGiot CroSS CLclvc.�vt 2000 H HWI — 1 _)P- he — � .4 = W StOpe Sor 1000 r = SUBMERGED OUTLET CULVERT FLOWING FULL J HW•H♦ho—LSo 5 800 120 For outlet trove not submerged,compute HW by 6 metlwde described on design procedure Soo108 .8 500 96 1.0 400 8 4 300 72 66 200 60 E* p C�� w 2 to U. 54 / o i z Z (n a8 D-4e / .a O 9.00 `J1 e `p � = 3 v 100 z -- / p0 �Fj c W o /— 42 00 b w 4 t� rL = _ 3 6 300 AO 5 N 60 5 0 FW- 33 6 App Epp w 30 40 Q 1300 +t 8 0 2 7 O V24 Qtr 10 20 10 15 8 6 12 4 4.3.5-13 V90 l7 (-Jcl Ij -KI'N)G COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3.5C HEADWATER DEPTH FOR SMOOTH INTERIOR PIPE CULVERTS WITH INLET CONTROL 100 yr �Io1 / Oeuelop d Livia ; boyL TaI(iaf Roam Cross CLLIver 180 10,000 168 8,000 EXAMPLE (2) (3)6. ENTRANCE TYPE 156 6.000 0.42 inches (3.5 fast) 6_ D•120 cis — 5 SQUARE EDGE WITH 144 4,000 6 S HEADWALL ,000 Ltw• ttw 132 D toot ,. 4. 3,000 (tl z.s e.e 5• 4 120 ' cis 2.1 7.4 I � � 2,000 (3) 2.2 7.7 4•- 108 3. 210 in fast 3' 96 I,000 3 PLAN �1 800 GROOVE END WITH HEADWALL 600 2. 500 1 72 400 3 v300 E!�p�f�/ N 1.5 I.S 1 Z 60 V 200 i 1.5 .`,. PLAN (2) Z ? W GROOVE END 0 54 a PROJECTING a w 48 !�W 100 Z > Cr 80 u 60 0. 1.0 1.0 u /2 w 0 0 50 HW SCALE ENTRANCE I.0 40 0 TYPE W 9 t— 36 30 (1) square edge with Q 9 .3 WTI - useheadwall 3 .9 0 Q ) Groove and with W OW heodwoll = 8 6 ) Groove end .8 projecting .T 7- .7se stole (2)or (3) project zontally to scale (1),thanstraight inclined lint through d 0 stoles,or reverse as .6 trated. 6 .6 2 15 .5 5 .5 1.0 --- 12 .J 4.3.5-11 1/90 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL FIGURE 4.3SG CRITICAL DEPTH OF FLOW FOR CIRCULAR CULVERTS 120 3,000 1 a99 14 106 2.000 102 96 IA00 90 —84 0.90 500 78 400 0.80 72 300 200 a70 60 - � 0.60 —54 u 46 50 ` 40 _ r 0.50 N F' - 0 30 42lop 0 20 �+ 0.40 36 0 10 0 33 2 Q 3 = 1.0 —30 5 9A a3o 4 27 v -� 3 A dc 24 oy 2 0 T 21 1 Note: For all cross-sectional shapes, d,can be calculated by ago is trial and error knowing that the c, quantity (Q2 T/gA)=1.0 at critical depth. 15 EXAMPLE D =66 inches, 0 = 100cfs d,/D - Ratio =0.50 12 dc= (0.50)(66 inches) = 33 inches 1 (12 inches/ft) dc=2.75 feet 4.3.5-15 1/90 RESULTS OF THE BASIN STUDY The Table 1 Basin Runoff Rates shows the peak flow rates of the 2, 10-, and 100-year return interval storms for the existing and proposed conditions. The pond storage capacity causes a small drop in the 2-year proposed condition peak flow rate from the existing condition flow rate. The 10-year proposed condition peak rate is 0.24 cfs greater than the existing condition. A part of this increase is due to the shorter time of concentration used for the 4.54-acre project area in the proposed condition. The 100-year storm is 0.7 cfs greater in the proposed condition because the peak rate passes unchanged through the detention pond. The pond was designed to attenuate the peak discharge rate for storms up to the 25-year event. The basin is drained by the 12-inch cross culvert located at Talbot Road Station 5+97. Analyses of this culvert were conducted using the standard HEC-5 culvert nomographs found in the King County Surface Water Design Manual. The 10-year and 100-year storm-peak flow rates were tested for maximum headwater stages using both inlet and outlet control. Table 2 compares the nomograph results for the 10-year storm existing and proposed conditions. In the existing condition, the stormwater stages up in the shallow ditch and flows onto the roadway at the sag north of the culvert. If the proposed 14"x 23" elliptical RCP culvert is installed and the open ditch replaced by an enclosed storm sewer, the headwater stays below the roadway base material and does not overtop or flow onto the road. Also, because of the larger cross-sectional flow area, the discharge velocity from the culvert to the steep channel leading to Springbrook Springs drops from 7.9 feet per second down to 3.6 feet per second. The situation is repeated for the 100-year storm values on Table 3. In the existing condition, Talbot Road floods at the sag curve during a 100-year flood with a discharge velocity of 12.3 feet per second. But if the existing culvert is replaced with the proposed 18-inch equivalent elliptical culvert, the headwater does not rise up to the roadway edge of pavement and the discharge velocity drops to 5.8 feet per second.