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HomeMy WebLinkAbout02800 - Technical Information Report _ ___ � f.. , i `.� ' � ��� � �,1±.� � � II _; �•- ;+t.,i}i� Renton, Washington Technical Informalion Report ��-�,-� A. _� � ti�tAs� -"� . f,�� ,��.�`t.� l, �.. ,.� Q' � � � 19tA'�> ;�' / �1�,'�Fcrsr��ti��� � �� Prepared By: �`�4�o�A�.ti�' Richard Klein, PE _ .. EXPIRES: Greg A. Diener, PE Pacific Engineering Design, Inc. Revised Ju�e 24, 1999 May 10, 1999 PEDI Job No. 98020 2800 TABLE OF CONTENTS I. PROJECT OVERVIEVV........................................................................................1-5 11. PRELIMINARY CONDITIONS SUMMARY...........................................................6-8 Ill. OFF-SITE ANALYSIS.............................................................................................9 EXISTIIvG VERSUS PROPOSED CONDI'I10NS........................................................................................ �0-11 A rt��tv�Arr�Su�a�xY�.......................................................................................................................12 ioo-Yx,24-HR SCS METI-IOD CALCi1LATI0�f.......................................................................................�3-19 25-YRAND 100-YRRA"I'IONr1I.CAL.CLILATIONS•••.........................................................•••.......................20-21 DOWNSTREA141 DRr1INAGE ANALYSIS WITH IV�1PS AND CAI,CLJI..A7'ION....................................................ZL�ZH IV. RETENTION/DETENTION ANALYSIS AND DESIGN.....................................29-34 V. CONVEYANCE SYSTEMS ANALYSIS AND DESIGN ....................................35-50 VI. SPECIAL REPORTS AND STUDIES...............................................................51-65 VII. BASIN AND COMMUNITY PLANNING AREAS...................................................66 VIII. OTHER PERMITS.................................................................................................67 IX. EROSIONlSEDIMENTATION CONTROL DESIGN .........................................68-69 X. BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND SKETCH, DECLARATION OF COVENANT................70 XI. MAINTENANCE AND OPERATIONS MANUAL...................................................71 � W � � W � O � � � ' � W � O �C 0. � (_� PROJECT OVERVIEW The site is comprised of 10.68 acres of land located to the east of Lake Washington Blvd., to the west of I-405, to the south of N. 28th Street, and to the north of N. 20th Street. At present,the site is a mobile home park. About 20.4 acres of land drains toward the site from the east down a steep hill. It is proposed that the mobile home park be replaced with a multi-family apartment complex camprised of about 190 units. The existing on-site drainage system except for a small area near the northwest corner of the site, routes the drainage southward to the southwest corner of the site along Lake Washington Blvd. where an existing drainage system conveys the flow under Lake Washington Blvd. westward through Gene Coulon Pazk, discharging into Lake Washington. The distance from Lake Washington Boulevard to the discharge point in the lake is approximatety 410 feet. The proposed multi-family apartment complex will have roughly the same percentage of impervious area as the existing site. The downstream drainage system piping with the exception of one 60-foot length of storm pipe is adequate to convey the developed flow to Lake Washington. The project is exempt from detention requirements since it discharges directly to Lake Washington, and the increase in peak rate runoff for the 100-year, 24-hour storm is less than O.Scfs. No on-site storm detention facilities are proposed. The inadequate section of downstream piping is proposed to be upgraded from a 12-inch to 24-inch pipe. ' A bio-swale is proposed to treat the 2-year, 24-hour storm event prior to discharge into the downstream drainage system. 2 • . : . . . . . . . . � • • . . � . . � • . � . . � . . � . .:iJ�rw..�s.�"r.'��•^• L�..�.ry., ..�w.t.. .�yy,���•���:v'�'4•8!•r+i`?�;.,'1�M�' .••�r a^ «e��i�v � C'� �„ .�v�. �• �! v - :�;paar���:�::��ROJE��OVkNE��"1VDa-�x�-, �;..'"�f;s��.w.� ;�P�Rt�2:�: PRO,lECT:�.O,G���.C_[l�i� t:'�;,;�� ":��t;���';',�,�j '�:�: :� :.��� �PROJECT�ENGiNEEF�`',`+'�.�.���:��p fif;,�,�;;� z�yx;������(f',,��<qN�!bESCpIPTlOM'.?./`�`°��,x.;w,.t,�.`�'���I�q�(�����,� �• �� �.l l� .l'�'��.�i. 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King County Buttdfn and Land Develo ment Divislon ' 9 P TECHNICAL INFORMATION REPORT {T1R) WORKSHEET ' , . • . � REFERENCE LIMITATiOWSiTE CONSTRAINT � Ch.4-Downstream Analysis 0 � � 0 a Q Additional Sheets Attalched � MINIMUM ESC REQUIREMENTS MINIMUM ESC REClUIREMENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION 0 Sedimenlalion Facilities � Stabi{ize Exposed Surface � Slabilized Construclion Enlrance � Romove and Reslore Temporary ESC Facilities � Perimetor Runoff Control � Cloan and Remove All Sill and Debris 0 Clearing and Grading Rostriclions � Ensuro Operalion of Permanent Facilities � Cover Practices � Flag Limits of NGPES � Conslruction Sequence Cl Olher � Other � - - - � Grass Lined Channel � Tank � Infillration , Molhod of Analysis � PipeSyslem � Vault � Depression SBUHt00Yr-24Hr 0 Open Channel 0 Energy Dissapalor 0 Flow Dispersal Compensation/Mitigalion � Dry Pond � Wetland � Waiver o�Eliminated Sito Storage � Wel Pond � S�ream 0 Regional Detenlion Brie(Descriplion of Syslem Oporation ihe on-site convevance svstem will collect runoff and route to a bio-swale�rior to discharee into downstream drainaAe svstem. Facility Relaled Site limitalions � Additional Sheets Attatched Relerange Facility Umitation � � Drainage Easement � Cast in Place Vault � Olher � Access Easement � Retaining Wall � Native Growth Prolec�ion Easement � Rockery>4'High Q Trac� 0 Structura!on Steop Slope Q Other . - . . I or c► civil onginoer undor my supervision havo visiled tho sito. Actual sito conditions ns obeorvod woro incorporated into this workshQet and tho ottatchmonts. 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OF ���uT�� ���C/���, �� �—�� —/�� _ :. _. . t ,_ � .____. ___ ,_.._.._.____ _ �� ���� cr,N ,�- __._ . _ _.:.._.. _.: :..___ . ___ J __. . __.�_...._..__.. . .�_.._ _' ___. _... . .__ . ` _ �_ . _.. _.. . _.. _ __. , . �vPGS !7�`�(!._. ; .�r,oc.,v�lou� �C�✓fvu.5 _ ' ' (5.F ,Ac � �, __ . .. _ ; __ . _ . . __ . _ _ _ .. . ..__ ; . _ .. . _. __. __ . : __ . �__ _ /v� S,fe _ �-��5� �n� _ _ __ 1 d.� f : . __ __ . ` . _ _. . l _ __��o�o� . _ __ :._ �_�Pd ,�7 YP� �_3� �� �_ . 3, 0 2 _ 3,0 2 _ : . _.. _ ��,3 � _ : _ _ ___ . . _ _ �u,l�G� _ � 10� b�s _ _ 2,40 2.�� _ __ _. __ 22,4_ �o . _��� � _ _ . :_ ;_ . __: . ; . __ _ _ : . _ __ . _ _ h�'���r� _ 22� ��� 5� 2� _ _ 5, 27 . �q.3_� � ;_ _ :_ __ .. . _ ; : _ _ :_ , __ _ �_ .. _ . _ . _ _ _ _ _ _. _ .__ . . ... ... o. � s . . _ :_ __ .: : __ . _ _ _ _ _ _ : _ . _ � . : _� ._ _ ___ : : , _ _ ;.._ _ � __ �__ . _ � _ � : : ; : _ __ . :. ., _ : : . . .___ __ _ : _ _ . : _ ;_ ,_. . . . _ : _ __ . : _ / . : _ _ _ _ _ _ _ . _ _ _ �.�7�-�__. � _e✓Yl,o v� _. �D.��_ _ :__. _ . ._.�._. . .. ; e►-✓�a�S �}�,3 �o. .. _ _ . __.... . _.. __ . . ._ .. . _ _ _._ :__. . __ __ ___ . : . . . ,. _. ! 1 _..:- _. _ _ _ . . . 130 ANDOVER PARK EAST, SUITE 300 SEATTLE, WASHINGTON 98188 (206) 431-7970� FAX:431-7975 6/24/99 2 : 14 :46 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DR.AINAGE STUDY --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: AA NAME: 100-YR. PRE-DEV. - ON-SITE SBUH METHODOLOGY TOTAL AREA. . . . . . . : 10 . 70 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 5 . 93 Acres 4 . 77 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 5 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns :0 . 1500 p2yr: 2 . 00 s : 0 . 1120 TcReach - Shallow L: 80 . 00 ks : 11 . 00 s : 0 . 1120 TcReach - Shallow L: 220 . 00 ks : 11 . 00 s : 0 . 1490 TcReach - Sheet L: 170 . 00 ns : 0 . 4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Channel L: 1450 . 00 kc :42 . 00 s : 0 . 0200 PEAK RATE : 8 . 88 cfs VOL: 2 . 67 Ac-ft TIME: 470 min BASIN ID: BB NAME: 100-YR. POST-DEV. - ON-SITE SBUH METHODOLOGY TOTAL AREA. . . . . . . : 10 . 69 Acres BASEFLOWS : 0 . 00 cfs R.AINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATI�N. . . . : 3 . 90 inches AREA. . : 5 . 27 Acres 5 . 42 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 5 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 1120 TcReach - Shallow L: 80 . 00 ks : 11 . 00 s : 0 . 1120 TcReach - Shallow L: 220 .00 ks :11 . 00 s : 0 . 1490 TcReach - Sheet L: 170 . 00 ns :0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Channel L: 1450 . 00 kc :42 . 00 s : 0 . 0200 PEAK R.ATE: 9 . 10 cfs VOL: 2 . 73 Ac-ft TIME: 470 min ..r.-» / � /� ��"�" In our calculations, to determine that peak flow leaving the site, we compared the 100-yr. SCS (SBUH) Methodology with the 25-year Rational Method and 100-year Rational Method. For the 100-year SBUH Methodology only, Since the total drainage basin to discharge is not homogeneous due to different soil types and different topography, we broke-up the basin into sub-basins and summed the hydrographs and then compared the flow rates with what they would be if the area was computed as one basin. The results are as follows: Storm Event One-Basin Combined Basin Hydrographs 100-yr. 24-hr. SBUH 10.72 cfs 13.84 cfs 25-yr. Rational 16.96 cfs -- 100-yr. Rational 20.17 cfs -- In doing our downstream analysis, an additional 7.23 acres of off-site area will contribute to the 29.53 acres being routed through our site. The peak flow used for analyzing the downstream drainage system was based on the 100-yr, 24-hr. SBUH Methodology. I ( i I �2 STORM DRAINAGE SYSTEM - PROPOSED I. 100-vr., Z4hr. SCS Method (Using,SBUH Method) A. Areas 1. On-Site- All "Type C" Soils Area = 10.69 Acres 2. Off-Site a. Type'A' Soils-R-8 Zoning (5-8 Units per acre) 510 x 135 / 2 = 34,425.0 = 0.790 510 x 160 / 2 = 40,800.0 = 0.937 490 x 335 / 2 = 82,075.0 = 1.884 (175 + 565) / 2 x 130 = 48,100.0 = 1.104 142 x 580 = 82,360.0 = 1.891 (610+ 530) / 2 x 145 = 82,650.0 = 1.847 555 x 260 / 2 = 72,150.0 = 1.65b 560 x 135 / 2 = 37,800.0 = 0.868 460 x 130 / 2 = 29,900.0 = 0.686 �. i}�c; � ��c�, . i� o e.u:i�.�� ��-� i;s:�i� �:�i a��c 70 x 50 / 2 = 1750.0 = 0.04tg (70 + 150) / 2 x 175 = 19,250.0 = 0.442 270 x 70 / 2 = 9450.0 = 0.217 270 x 160 / 2 = 21,600.0 = 0.496 240 x 55 / 2 = 6600 = 0.152 Acres 1.347 Actual Density=4.45 Units/Acre �45 c. Type'C' Soils- Steep Slopes 130 x 250 = 32,500 = 0.746 (110+ 180) / 2 x 100 = 14,500.0 = 0.333 95 x 1Q0 = 9500.0 = 0.218 (110 + 50) / 2 x 125 = 1Q,000.0 = 0.230 670 x 250 / 2 = 83,75Q.0 = 1.923 675 x 75 / 2 = 25,312.5 = 0.581 635 x 175 / 2 = 55,562.5 = 1.27b 13 675 x 75 / 2 = 25,312.5 = 0.581 635 x 175 / 2 = 55,562.5 = 1.276 570 x 115 / 2 = 32,775.0 = 0.752 540 x 210 / 2 = 56,700.0 = 1.302 Acres 7.361 Total Off-Site Area = 20.421 Acres B. "CN" FaCtnrc 1. On-S Impervious = �.43 �lcres �' L:N = y� Pervious = 5.26 Acres Q CN = 86 Total Area = 10.69 Acres Portion to Downstream Impervious = 5.083 Acres @ CN = 9S Pervious = 4.025 Acres @ CN = 86 Total Area = 9.11 Acres 2. Off-Site a. Impervious = 0.30 x 11.713 = 351 Q CN = 98 Pervious = 0.70 x 11.713 = 8.20 Q CN = 68 b. Impervious = 0.46 x 1.347 = 0.62 Q CN = 98 Pervious = 0.54 x 1.347 = 0.73 Q CN =86 c. Pervious = 7.36 Q CN=76 Pervious = 4.03x86 + 8.20x68 + 0.73x86 + 7.36x76 20.32 = 20.32C�3CN = 75.11 C. Tc 1450 LF Q S = 2.00% (Pipes) - 4.07 170 LF Q S = 459'0 (Sheet Flow - Forest) - 11.95 220 LF C�3 S = 14.99'0 (Shallow -Grass) - 0.86 80 LF C�3 S = 11.2qo (Shallow - Grass) - 0.36 300 LF Q S = 11.2% (Sheet- Grass) - 14.98 T = 32.22 Min. D. P = 3.9" - 100-yr. - Renton, WA 14 5/7/99 1 :36 : 32 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY BASIN SUMMARY BASIN ID: A NAME: 100-YR. EX. FLOW TO DISCHARGE SBUH METHODOLOGY TOTAL AREA. . . . . . . : 29 . 53 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 20 . 32 Acres 9 . 21 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 75 . 11 98 . 00 TC. . . . : 32 . 23 min 32 . 23 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 1120 TcReach - Shallow L: 80 . 00 ks : 11 . 00 s : 0 . 1120 TcReach - Shallow L: 220 . 00 ks : 11 . 00 s : 0 . 1490 TcReach - Sheet L: 170 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Channel L: 1450 .00 kc :42 . 00 s : 0 . 0200 PEAK RATE: 10 . 72 cfs VOL: 5 . 52 Ac-ft TIME: 480 min �� __.--� 5/7/99 1 : 37 : 33 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY BASIN SUMMARY BASIN ID: B NAME: 100-YR. EX. FLOW FROM ON-SITE SBUH METHODOLOGY TOTAL AREA. . . . . . . : 9 . 11 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 4 . 03 Acres 5 . 08 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 6 . 92 min 6 . 92 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 . 0110 p2yr : 2 . 00 s : 0 . 0200 TcReach - Channel L: 1150 . 00 kc :42 . 00 s : 0 . 0200 PEAK R.ATE: 7 . 39 cfs VOL: 2 . 38 Ac-ft TIME: 480 min BASIN ID: C NAME : 100-YR. EX. FLOW FROM SLOPES SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 36 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 7 . 36 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 76 . 00 98 . 00 TC. . . . : 17 . 55 min 17 . 55 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 170 .00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Sheet L: 130 . 00 ns : 0 . 0110 p2yr: 2 . 00 s : 0 . 0200 TcReach - Channel L: 1320 . 00 kc :42 . 00 s : 0 . 0200 PEAK RATE: 2 .30 cfs VOL: 1 . 02 Ac-ft TIME: 480 min BASIN ID: D NAME : 100-YR. EX. FLOW TYPE-C OFF SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 35 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 73 Acres 0 . 62 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . : 21 . 78 min 21 . 78 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 220 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 1490 TcReach - Sheet L: 80 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Shallow L: 90 . 00 ks :3 . 00 s : 0 .4500 TcReach - Channel L: 1450 . 00 kc :42 . 00 s : 0 . 0200 PEAK RATE : 0 . 84 cfs VOL: 0 . 34 Ac-ft TIME : 480 min �� 5/7/99 1 : 38 : 3 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY BASIN SUMMARY BASIN ID: E NAME: 100-YR. EX. FLOW FROM TYPE-A SBUH METHODOLOGY TOTAL AREA. . . . . . . : 11 . 71 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 8 . 20 Acres 3 . 51 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 98 . 00 TC. . . . : 32 . 23 min 32 . 23 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 .00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 1120 TcReach - Shallow L: 80 .00 ks : 11 . 00 s : 0 . 1120 TcReach - Shallow L: 220 .00 ks : 11 . 00 s : 0 . 1490 TcReach - Sheet L: 170 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Channel L: 1450 .00 kc :42 . 00 s : 0 . 0200 PEAK RATE: 3 .30 cfs VOL: 1 . 85 Ac-ft TIME: 480 min � � �--^ , 5/7/99 1 : 56 :4 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY --------------------------------------------------------------------- --------------------------------------------------------------------- HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM R.ATE PEAK HYDRO Area cfs min. cf\AcFt Acres --------------------------------------------- --------------------------------------------- 1 13 . 839 480 243400 cf 29 . 53 —= BQ51k S 2 3 . 646 480 61437 cf 7 . 24 �l C� D, � � 3 17 . 485 480 304836 cf 36 . 77 CO�a �l�t�'�C 9 3 . 168 480 45140 cf 9 . 11 10 4 . 906 480 90839 cf 29 . 53 � 8 ,� i ..-� e H .�.�t ��' ,,i� \ .� ��. y� 1 � � ;` .: ��� l� , ��,� ' Y i " 4�`3'C} = I�I � ��it�\ 4..\ �� t,\ � �1� ��� _ --- /�. �J��IL' / '// / l . �/ y.!_.1 �\ ,l, �\I .. \\,{\\\\ rlt,` � ,\ 1!(/�. � r � -�� � t� ll_ . i,4,/. r .\ / , 1, �jll�o��� S �� � ������i, � ���.i/ . - � �� '�II111 ,� �� i:ii i� ����� ..�✓•^z. \ o��. ` ' \ ���. 1\� �` ��\\ \ \ �,;Id��RI11�i+a4: - _�:`���ir;=�.Y:r:' =C, / �`• �A `, �'�� ` (�� �\l\��t1�\�\� �• ,�tii!�`\.1�'•�iT�'�� ' ;�. � i ,�1.` \ 1 � \` `�l �\„\\\����1�11��\w.� ^.{,�i� c'���, �� �� \\ _ � � \•�;,4,\I,�\` ��1 . � `� \ ^ �',� ... . 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I { i � � ` :.� � ``,. `t� r� i I � V \_ l i� � 1 ,�' 1'`�1� \ � � l` � 1�`I �\ \ ? \���� ��`�I�/�l!l�rl�� ' ' /, � � � �' ` � ' � � : 1�� � , � // � y , , , , , �l, _ ., �.�� _ , � ` ; ; ;�; ;�� t, ,;�;;,;,,�_ ;� � `"'� II� (/' /1� / / \ (\\ � i � � � �� ,�; �����}��if� i �I \ .�Y �� I�\� l l F �� \ \ \\ \ � \� �1�1��1� J � l ���� ` - —_ - !�\� /, . ,�f_.�� �. . �, .� . :� ,,�,�'� �,'. '� �''�t, , ;»����`,��,; , ; , STORM DRAINAGE SYSTEM - PROPOSED II. 25-kr Rational l�Iethod Total Area = 20.42 + 8.70 = 29.12 Acres P = 3.40" "C" Factor On-Site - 4.85 Ac @ C = 0.90 } g,�0 —� C = 0.612 3.85 Ac C� C = 0.25 Off-Site - 3.51 Ac @ C = 0.90 8.20Ac@C = 0.25 0.62 Ac @ C = 0.90 2�.42 0.73 Ac @ C = 0.25 7.36Ac@C = 0.15 C = 8.98x0.90 + 12.78x0.25 + 7.36x0.15 29.12 C = 0.425 Tc = 18.33 Min. (from pipe sizing calcs) irz= (aa) (Tc)-(bR) = 2.66 (18.33)-0.6� IR = 0.402, IR =3.4x0.402 = 1.37 Q = CIA = 0.425x1.37x2912 = 16.96cfs III. 100-yr Rational Method - Using Entire Basin A = 29.12 Tc = 18.33 C = 0.425 1R — �aR) (T�)-roR� = 2.61 (18.33)-0.63 ia = 0.418 Irz = P (LR� = 3.90x0.418 = 1.63 Q = CIA = 0.425x1.63x29.12 = 20.17cfs 20 � � �I'�I.,.�. -- \ �.1 � `` � ` � '\ `. , . 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I —� � � ` 1� `\ \ �` � `ti�-'. - .�� � 1,����,`. ,��.� ---T— ��---- \�\ t `.:i\t`'"¢�a`=":,-_i�!w 1�, ����`•. ���.�l �.. , ��. � '�� .. , «h.. ;��> >,�->-.* �,,;,��;�,, �� , 1�� � ,. . ,_;,,�. ,,, �--;,�-; ,�,� ��� \`: � � �,,1 p� � ti�'S , s� i�2'ir��=�_. `�Ui;�i��% � b�n.li%', q' ''�1� '/.�ii / /� i ' '.tFQlf i. \\-.`�\,� r`T,1 - .\1�".1�� _ _ � \ ���i� if' r\��ll�, y�{�i i! .l����.i� � __ �\ 1 `�Y���Y` ' ,�,�� �t• � i�"�I (.'il�.�/�� +(�I/(�{'¢/ �/,(, y-�1�//� '� ,`i \1 ��_4:��.��lL� . _�' � � I�i���.-5- S�E��f.GPal9•7't;� �..�.5'��.�../v.�. '. DOWNSTREAM DRAINAGE ANALYSIS The entire site comprising 10.69 acres with the exception of 1.59 acres in the northwest corner and west side will drain southward to the southwest corner of the site. The total off-site area draining through the site to the same point is 20.42 acres. After being routed through the biofiltration swale the discharge will go into a downstream manhole labeled as 1. The peak flow from the site into this manhole is 13.84 cfs using the 100- yr., 24-hour SBUH Methodology. An additional 7.23 acres of off-site area from the east enters the same manhole 1 from a catch basin labeled as lA. This peak flow is 3.65 cfs using the same 100-yr, 24-hour SBiJH Methodology, for a total flow into manhole 1 of 17.49 cfs. I Passing this flow through the downstream drainage system all the way to Lake Washington reveals that all of the pipes except for the section between 1 and 2 will be adequate to convey the flow. We will replace this existing section of pipe with a 24-inch pipe which will be more than adequate to handle the flow. The distance from manhole to the discharge point in the lake is about 470 feet. (See attached map on page 23) �, , � � I ' 22 � ,�, ,J� -��_ ��� ;.._� (� �... � ,- . , ; , � '� � c�'''__... � f W END 36" CMP )�/ INTO LAKE WASHINGTON IE= 16.5' ll � 11 ll � ll � ll � �� �� .� .J � ll � / �� N N �� y � �. � // �, � � �--�— .�,, � I � ` - s � � � ; � b �`� r�`'t ' . � (�` b Q� Z �: �� � � m � ,`, �._ � `° z N � I. � � ' � ° � __. +� Z, b � � SDMH 48" W�GRATE �� � RIM= 26.4' �r� � �'���; ._...��.1; I � � TOP 24' CMP VERT. 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(t �j �,�;�����,�,���,�,,�� /� u�;. � 0 ;�,,�� '�. ,;,;,� — r 111;1����4�1��h,y��,// •\ \ ll' �- � ��1�� , ` 1 � l !� ' \ I � I� u����i�ii�����i�:i+��r /� ��. �lu�, 1 � ��� ,��,� �� � 111 11�111� 1i'�l�/{//� � 1�� ���� � 1 \�� ��,1 II� ,y✓_� _ _ � fJ . . '�y1',," 1�1�ii�'����1'4ii"r�V � \\� ��1i ...,1'� �`�� \��`�� -- ') (`'�'�!'''7' /�__ '�� /- ' � J 1• \ 1�I' �. � t11ii��������Oi�>>ti \ � �\ �� \ '\ V'' : �� �� L.1-__-_' -�_._ _ ) _J �.� 111 �i l�l I 4 1�I � >, �1 1 '\ \�1� 1�``\� • 1 � � --_ _ -�,--.-:., ___� -� r'�,� I��I� '„ � �_�,�� ui��,����i�����,',i��'�ti��� �� � ��1�� �\��i�, �`������` � ','` ��' � �__ 5/7/99 2 :48 : 31 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY BASIN SUMMARY BASIN ID: OF-1 NAME: OFF-SITE FLOW TO DOWNSTREAM SBUH METHODOLOGY TOTAL AREA. . . . . . . : 7 . 23 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 5 . 14 Acres 2 . 09 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 77 . 73 98 . 00 TC. . . . : 27 . 98 min 27 . 98 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 2530 TcReach - Shallow L: 280 . 00 ks : 3 . 00 s : 0 . 3500 TcReach - Shallow L: 440 . 00 ks :27 . 00 s : 0 . 0489 TcReach - Channel L: 140 . 00 kc :42 . 00 s : 0 . 0178 PEAK RATE: 2 . 95 cfs VOL: 1 .40 Ac-ft TIME: 480 min BASIN ID: OF-2 NAME : OFF-SITE FLOW TO DOWNSTREAM SBUH METHODOLOGY TOTAL AREA. . . . . . . : 4 . 25 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 4 . 25 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 76 . 00 98 . 00 TC. . . . : 27 . 98 min 27 . 98 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 2530 TcReach - Shallow L: 280 . 00 ks : 3 . 00 s : 0 . 3500 TcReach - Shallow L: 440 . 00 ks : 27 . 00 s : 0 . 0489 TcReach - Channel L: 140 . 00 kc :42 . 00 s : 0 . 0178 PEAK RATE: 1 . 10 cfs VOL: 0 . 59 Ac-ft TIME: 480 min BASIN ID: OF-3 NAME : OFF-SITE FLOW TO DOWNSTREAM SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 . 98 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 89 Acres 2 . 09 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 5 . 00 min 5 . 00 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 . 0110 p2yr: 2 . 00 s : 0 . 0488 TcReach - Shallow L: 140 . 00 ks : 27 . 00 s : 0 . 0488 TcReach - Channel L: 140 . 00 kc :42 . 00 s : 0 . 0179 PEAK RATE : 2 . 74 cfs VOL: 0 . 82 Ac-ft TIME : 470 min 2� � , 5/7/99 2 :48 :31 pm Pacific Engineering Design Inc page 2 TAMARON POINTE JOB NO. 98020 DR.AINAGE STUDY --------------------------------------------------------------------- --------------------------------------------------------------------- HYDROGRAPH SUMMARY �� PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres Qioo �'v 81o��1E' 1 13 . 839 480 243400 cf 29 . 53 2 3 . 646 480 61437 cf 7 .24 ��" 2 � Q�-3 3 17 .485 480 304836 cf 36 . 77 f/yD l -I- /�yD 2 9 3 . 168 480 45140 cf 9 . 11 10 4 . 906 480 90839 cf 29 . 53 Z Co� -s,�� ��l ) r 8�a - swAle Q T i T B�v - swGle 28 �-. IV. RETENTIONIDETENTION I' ANALYSIS & DESIGN �-, � �--� , . ; , �-� �, : 1 ; ; -� '�� � �� � The project is exempt from detention requirements since it discharges directly to Lake Washington, and the increase in the peak rate runoff for the 100-year, 24-hour storm is less than O.Scfs. Since no storm detention facilities are proposed, this section sha11 not apply. However, we will use the space for design of the bio-filtration swale. Bio-Filtration Swale Desi�n Qz = 3.17 cfs - On-site only(see attached calcs) Assume depth of flow= 8" (wetlands plants) B = 9.64' Total Width= (2' +2'+9.64)x 200 = 17.6 155 B* = 17.6 - 2 - 2 = 13.6 Qioo = 13.84 cfs - Total Drainage Basin - 100-yr flow V= 3.07'/sec (See attached calcs), Y=0.31' Bio-swale= 155 LF, B* = 13.6 Side Slopes= 3:1, S =2.0% � � _..,.....-. �rv , I 5/7/99 3 : 0 : 14 pm Pacific Englneering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: A-2 NAME: 2-YR. EX. FLOW TO DISCHARGE SBUH METHODOLOGY TOTAL AREA. . . . . . . : 29 . 53 Acres BASEFLOWS : 0 . 00 cfs R.AINFALL TYPE . . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 20 . 32 Acres 9 . 21 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 75 . 11 98 . 00 TC. . . . : 32 . 23 min 32 . 23 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 300 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 1120 TcReach - Shallow L: 80 . 00 ks : 11 . 00 s : 0 . 1120 TcReach - Shallow L: 220 . 00 ks : 11 . 00 s : 0 . 1490 TcReach - Sheet L: 170 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Channel L: 1450 . 00 kc :42 . 00 s : 0 . 0200 PEAK RATE : 3 . 37 cfs VOL: 2 . 01 Ac-ft TIME: 480 min BASIN ID: B-2 NAME: 2-YR. EX. FLOW FROM ON-SITE ; ' SBUH METHODOLOGY _ TOTAL AREA. . . . . . . : 9 . 11 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP �li PRECIPITATION. . . . : 2 . 00 inches AREA. . : 4 . 03 Acres 5 . 08 Acres ' TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . . 6 . 92 min 6 . 92 min ABSTR�CTION COEFF: 0 . 20 TcReach - Sheet L: 300 . 00 ns : 0 . 0110 p2yr: 2 . 00 s : 0 . 0200 TcReach - Channel L: 1150 .00 kc :42 . 00 s : 0 . 0200 PEAK RATE: 3 . 17 cfs VOL: 1 . 04 Ac-ft TIME : 480 min III, BASIN ID: C-2 NAME: 2-YR. EX. FLOW FROM SLOPES SBUH METHODOLOGY i � TOTAL AREA. . . . . . . : 7 .36 Acres BASEFLOWS: 0 . 00 cfs �I RAINFALL TYPE. . . . : KC24HR PERV IMP '� PRECIPITATION. . . . : 2 . 00 inches AREA. . : 7 .36 Acres 0 . 00 Acres I TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 76 . 00 98 . 00 '' TC. . . . : 17 . 55 min 17 . 55 min ABSTR.ACTION COEFF: 0 . 20 TcReach - Sheet L: 170 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 . 4500 TcReach - Sheet L: 130 . 00 ns : 0 . 0110 p2yr: 2 . 00 s : 0 . 0200 TcReach - Channel L:1320 . 00 kc :42 . 00 s : 0 . 0200 PEAK RATE : 0 . 26 cfs VOL: 0 . 25 Ac-ft TIME: 490 min 3 / 5/7/99 3 : 1 : 6 pm Pacific Engineering Design Inc page 1 TAMARON POINTE JOB NO. 98020 DRAINAGE STUDY BASIN SUMMARY BASIN ID: D-2 NAME: 2-YR. EX. FLOW TYPE-C OFF SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1 . 35 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 73 Acres 0 . 62 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 98 . 00 TC. . . . : 21 . 78 min 21 . 78 min ABSTRACTION COEFF: 0 . 20 TcReach - Sheet L: 220 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 1490 TcReach - Sheet L: 80 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Shallow L: 90 . 00 ks : 3 . 00 s : 0 .4500 TcReach - Channel L: 1450 . 00 kc :42 . 00 s : 0 . 0200 PEAK R.ATE : 0 . 34 cfs VOL: 0 . 14 Ac-ft TIME: 480 min BASIN ID: E-2 NAME: 2-YR. EX. FLOW FROM TYPE-A SBUH METHODOLOGY TOTAL AREA. . . . . . . : 11 . 71 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 8 . 20 Acres 3 . 51 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 98 . 00 TC. . . . : 32 . 23 min 32 . 23 min ABSTRACTION COEFF: 0 . 20 , TcReach - Sheet L: 300 . 00 ns : 0 . 1500 p2yr : 2 . 00 s : 0 . 1120 TcReach - Shallow L: 80 . 00 ks : 11 . 00 s : 0 . 1120 TcReach - Shallow L: 220 . 00 ks : 11 . 00 s : 0 . 1490 TcReach - Sheet L: 170 . 00 ns : 0 .4000 p2yr: 2 . 00 s : 0 .4500 TcReach - Channel L: 1450 . 00 kc :42 . 00 s : 0 . 0200 ' PEAK RATE : 1 . 15 cfs VOL: 0 . 65 Ac-ft TIME: 480 min 32 MAN-MADE CHANNELS I VARIABLES LIST: Y - FLOW DEPTH B - CHANNEL BOTTOM WIDTH S - CHANNEL SLOPE Q - FLOWRATE M - CHANNEL SIDE SLOPE N - CHANNEL ROUGHNESS � VARIABLE TO BE SOLVED (Y, Q, B,M, S OR N) ? B Y {FT) ? . 667 RESULTS 4 (CFS) ? 3 . 17 _________________ M (FT/FT) ? 3 B= 9 . 64 FT S (FT/FT) ? . 02 A= 7 .77 SF N (FT^1/6) ? . 35 P= 13 . 86 FT V= 0 . 41 FPS F= 0 . 10 SUB-CRITICAL FLOW <Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu ------------------------------------------------------------------------------- � MAN-MADE CHANNELS VARIABLES LIST: Y - FLOW DEPTH B - CHANNEL BOTTOM WIDTH S - CHANNEL SLOPE Q - FLOWRATE M - CHANNEL SIDE SLOPE N - CHANNEL ROUGHNESS VARIABLE TO BE SOLVED (Y, Q, B,M, S OR N) ? Y Q (CFS) ? 3 . 17 RESULTS B (FT) ? 13 . 6 _________________ M (FT/FT) ? 3 Y= 0 . 55 FT S (FT/FT) ? . 02 A= 8 . 44 SF N (FT^1/6) ? . 35 P= 17 . 10 FT V= 0 . 38 FPS F= 0. 09 SUB-CRITICAL FLOW <Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu --------------------------- ---------------------- - --- --------- - --- ------- 33 P�I.z1N-MADE CHANNELS VARIABLES LIST : Y - FLOW DEPTH B - CHANNEL BOTTOM WIDTH S - CHANNEL SLOPE Q - FLOWR.ATE M - CHANNEL SIDE SLOPE N - CHANNEL ROUGHNES� VARIABLE TO BE SOLVED (Y, Q, B,M, S OR N) ? Y Q (CFS) ? 13 . 84 RESULTS B (FT) ? 13 . 6 _________________ M (FT/FT) ? 3 Y= 0. 31 FT S (FT/FT) ? . 02 A= 4 . 51 SF N (FT^1/6) ? . 030 P= 15. 56 FT V= 3 . 07 FPS F= 1 . 00 SUPER-CRITICAL FLOW <Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu ------------------------------------------------------------------------------- 3� V. 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