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Home My WebLink About03176 - Technical Information Report STORM DRAINAGE ANALYSIS AND TECHNICAL INFORMATION REPORT CENTER CYCLE BUILDING 3850 LI N D AVE SW RENTON, WASHINGTON for: Dave Groom Center Cycie 3900 Lind Ave SW Renton, WA 98031 February 20, 2004 �i�� J �,ti� , Z.00�� '�"�� ). _�'�< �, �'y� � a� . V � 2�0�'1 �� ,, . 6/o�� 3 I 3 _ - � ,_ �/o H R`'` � P� = = - � � by Rykels Engineering Group, Inc 28301 183nd Ave SE Kent, WA 98042 ph 253-631-6598 �,�n�p� � fax 253-638-1982 �� / ' � o� c� � a ► �� Center Cycle, Renton, WA TABLE OF CONTENTS I. PROJECT OVERVIEW II. PRELIMINARY CONDITIONS SUMMARY III. OFFSITE ANALYSIS IV. RETENTION/DETENTION SYSTEM V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN VI. SPECIAL REPORTS AND STUDIES VII. BASIN AND COMMUNITY PLAN AREAS VIII. OTHER PERMITS IX. EROSION/SEDIMENTATION CONTROL DESIGN X. BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET XI. MAINTENANCE AND OPERATIONS LIST OF FIGURES AND ATTACHMENTS FIGURES 1. PROJECT LOCATION MAP 2. EXISTING SITE TOPOGRAPHY 3. PROPOSED SITE IMPROVEMENT PLAN 4. DETENTION SYSTEM IMPROVEMENTS ATTACHMENTS 1. RESULTS OF HYDROLOGIC ANALYSIS 2. DEVELOPED CONDITIONS 3. EXISTING CONDITIONS 4. WATER QUALITY TANK SIZING � Center Cycle, Renton, WA I. PROJECT OVERVIEW Predeveloped Conditions - The approximate 0.84 acre site is located at the southeast corner of the intersection of Lind Ave SW and SW 39`h Street in the City of Renton, WA. There are no existing structures on the site. The existing condition of the site is a vacant grassy field. The site is currently unused, although it appears that the property has been filled in the past. The site is predominately level. Available topographic information indicates that the property generally sheet-drains Lind Ave. There are no streams, swales, ponds or other significant hydrologic features identified on the site. Developed Conditions - The proposed project, known as Center Cycle includes the development of the site with an approximate 7,300 sf building for sales and service of bicycles. Approximately 7,100 sf of paved parking and access improvements are also proposed, the remainder of the site will be landscaped. The required improvements will include the connection to existing water and sanitary sewer mains, construction of a storm drainage collection and water quality system, and paving improvements. The City has required construction of a new concrete sidewalk along the Lind Ave frontage. The storm drainage system will discharge to the existing drainage system located within the access road to the east. II. PRELIMINARY CONDITIONS SUMMARY There are no special drainage requirements that apply to the development of this i property. The preapplication requirements specify that the storm drainage design I requirements applicable to this project are found in the King County Surface Water � Design Manual as modified by the City of Renton i III. OFF-SITE ANALYSIS � A. Upstream Tributary Areas —All properties surrounding this site are fully developed � with recent commercial construction. Each site has its own storm drainage collection, detention and water quality system that discharges to the 54-inch storm drain located in Lind Ave/ B. Downstream Analysis -The property will discharge to an existing 15-inch storm drain system that flows from east to west along within the private access road. This existing system drains to the existing 54-inch storm drain located in Lind Ave. There are no specific problems related to this system. C. Existing Soils - The King County Soils Survey Maps identify the soil types for the subject site as Renton Silt Loam Series, Hydrologic Soil Group, "D"., these soils have been covered by 3-4 feet of imported fill. 3 . � . Center Cycle, Renton, WA IV. RETENTION/DETENTION ANALYSIS AND DESIGN A. Existing Site Hydrology - The project drainage basin is shown in on the exhibits. There is one subbasin identified for the existing site and tributary area. Existing predeveloped conditions for the site is summarized in Table 1. Table 1 Existin Site H drolo ic Characteristics Pervious Area CN Pervious Impervious CN Impervious Area 0.68 91 0.16 98 The following are the Computer generated peak flow rates for the subbasin hydrographs for existing conditions. Table 2 Existin Site Runoff 24 hr design storm 2-yr 10-yr 100-yr eak runoff rate 0.17 cfs 0.30 cfs 0.44 cfs B. Developed Site Hydrology - The developed drainage system consists of the runoff from all the lots and the proposed roadway improvements. Due to the topography of the site, there is no developed area that will bypass the detention facilities. Table 3 Develo ed Site H drolo ic Characteristics Subbasin Pervious Area CN Pervious Impervious CN Impervious Area � dev 0.18 90 .66 98 The following a�e the Computer generated peak flow rates for developed conditions for I the hydrographs to be routed through the RD facility. � Table 4 Develo ed Flow Rates � 24-hr design storm 2-yr 10-yr 100-yr eak runoff rate 0.40 cfs 0.61 cfs 0.85 cfs C. Hydrologic Analysis —The applicable drainage requirements of the City of Renton specify that storm drain detention is not required for those projects who developed rate of runoff does not exceed the existing rate of runoff by 0.50 cfs or less. The following table compares the pre-post runoff rates for the subject site, and confirms that the project is Exempt from onsite detention. Table 5 Pre-develo ed vs Develo ed Flow Rates routed throu h R/D Fac. 2-yr 10-yr 100-yr Developed Runoff 0.40cfs 0.61 cfs 0.85 cfs Existing Runoff 0.17 cfs 0.30 cfs 0.44 cfs Net Increase in Runof 0.23 cfs 0.31 cfs 0.41 cfs 4 Center Cycle, Renton, WA Detailed calculations and hydrograph analysis for this system are attached to the rear of the report. D. Retention/Detention System- Storm drainage is not required for this project. E. Water Quality. - The BMP for storm water quality is the use of a wet vault. All runoff from the parking lot and paved areas will be collected and discharged to this wet vault. The downspout runoff will bypass the water quality vault and will discharge directly to the existing storm drainage system. Design calculations for the water quality vault are included in the appendix. Water quality treatment will be provided by using 90 If of 36" CMP with 2.5 feet of dead storage designed into the tank. V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN Detailed calculations for pipe sizing are attached as an appendix to this report. VI. SPECIAL REPORTS AND STUDIES No special reports or studies have been prepared. VII. BASIN AND COMMUNITY PLANNING AREAS There are no specific drainage development conditions that apply to this project. VIII. OTHER PERMITS A commercial building permit is required for this project, there are no other permits that are required. �� IX. EROSION/SEDIMENTATION CONTROL DESIGN � Detailed design plan for the ESC measures will be submitted as part of the project ! submittal. � � X. BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY � SUMMARY SHEET AND SCHEMATIC AND DECLARATION OF COVENANT i These submittals are will be provided to the City as required. XI. MAINTENANCE AND OPERATIONS MANUAL 5 Center Cycle, Renton, WA The storm drainage improvements will be owned and maintained by the Center Cycle, a Maintenance Manual will be provided with the final submittas. 6 � _ _ 2� , T . � � � � � � � �� , �: ,_, ��, �,, - Q � � o = � z >- � J J (1� a SW 39TH ST > � W __ J � W a z 0 � � Y � ._ Q Q � � SW 41 ST ST PR ECT LOCAIION = PROJECT VICINITY MAP (NOT TO SCALE) - I i - i , �=� LEGAL DESCRIPTION � � LOT 1 OF CITY OF RENTON SHORT PLAT I LUA-97-159-SHPL, ACCORDING TO THE SHORT � T PLAT RECORDED UNDER KING COUNTY ,! � RECORDING NUMBER 9805219013, RECORDS OF j � KING COUNTY, WASHINGTON. � i � �" SITUATE IN THE CITY OF RENTON, COUNTY OF I � KING, STATE OF WASHINGTON ! �; I � C iO � I C I N � 7 U O � � �i I � I � _ ; � '. • SSMH P�� _� J ��s�G `� -��w L,Ne ELEC .o � . � N�� S/DeWaCK O ^ � � �URg • � �ps _& GUTTfR __ N u� SOLlD w�r�S r _D�LP�` =\ C m � w \ RIPf `1�'�' STRrP�1 B ��\_/� Vo �' RP'kS '� a " � F /I —_�;� 's�w 1 �� URQ &� TeR � ►'AR�A8 N o / � � I � 'T/_ �-�_ � �—R�c�r eF-wi,�ior � 6' c.� / � � i � ' �J �\ ` �6 /A1r i � I � i l __\�_„SDRI `\� . CB � 1 � i � RIM=16�6�� I I � � i I.E. 15"PVC(E,S)9�37��\ , � ( � i 1 I.E. 24"CONC.(W)=8.18 �,� � I � �I � ' � � �� = , I ; 1 P=,s�cPvc_/�� o , �\�\ '! I I �{ I i / TRAFFIC SIGNAL OPERATIO 5�.��/ 1 V� I �c� I , I,� � i & MAINTENANCE ESM'T TO LROAD R/W � � � � CITY OF RENTON REC, N0. ^ ESM'T � I I � � + � / ♦ 9206302701 // � � �� / � ZQ�, �� / � 206302696 � / 36,72g sq.ft. SET PK NAIL W/TAG P � � � � I' i '-� 0.84 acres "HDA 23345" }f' /',�� + I i 3850 /� � �� \ 1-�STORY � � I i LIND AVENUE SW ^� �� U _ � �� \ CRETE � � � 1 I .� S. \ ' �— HUILpING � FDc I I � I i / GJ�� .�P�� '• i G. � SDMH + � �N� � � SDMH __ � '� � GO� /��' RiM=15.44 � � ' � i RIM=15.33 �11+ � GJ� �� ' I.E. 15"PV�NE,: � � I � i I.E. 15"PVC(SE.NW)=10.25 . �j � / �'-� �tI �6 � I I I � •�6� �� /�•'( \��/ � � RR � � � 11 � � � SWITCH � i ` / / i ' ,'�•'/ � \ � / �' \y I � 1 p�� /,�' EX. 30' ACCESS EASEMENT 40070 \' I� I � Q�P�� / �' �'ti/0�0� I REC. N0. 9206302702 � � � � P5 / �P /. �� G• /,� � . DC /�'' I / � /i�/' � ��I �W � � � � i /.' � � � �1 AD�I JI � � /� � SET PK N AIL W/TAG �_J G � � +�O �� "HDA 23345" � �! �� I I / �� i N �.``� �� f � V ( � ;c�� / ,�/ � � � I � � , � � � �I, v i � � I ,'/ SfT PK NAIL W/TAG �/ � l I I � � � "HDA 23345' � I �� % �, .,E (RAo�_ / � , � � �I I i %� �) �p�154 35 . � / �I �� ( ( �� I � � � ' �2'�ac,_��`��esa� �/ CE�lT�'IZ CY�LC �' � � il �� ' �-' .__�--� I I� 112.00 � � EX�5T1N 6 TOpo � �� I �� _ � N 01'50'09' � �•��,. � ___ E �� "''`/`�� \��Se( EASEMENT FC � ' � r � — �� ExHieir `B• E \ �� I� Ss� / � ��=� � \'�,�� ` REC. N0. 96C � II I ( 0 � � �� o 'ii�' � \�� _ __— � t ! � I 1� V �� . . �� , �� ——r—_�. RENTON CYCLE CENTER, RENTON, WA A PORTION OF THE 51f/4 OF SEC. 30, TNP 23N, RGE 5E, 11.M. � i � �-___� � � � wsMa -� � � � , � � � -_R , � --_._ , , ' _ � _ , , ��.,m.....�„ _ I � A�'"101""'A°�'°�'}�' PROJECT VICINITY MAP � �,j � waawmaaeauur no�►ur I ��r Nro�.an.Trienna� ? � [ut apw o w �� i• M wa,u � �,� �� ' '� LEGAL DESCRIP110N � � . icr i a an a��a sairt�ur uu�-n-�etsr�.�atawn ro nc s�oRt c.� aeaw � � n"�oo�o�wmiia+�a ucaoa a Z � II ` �c mum�wwrctaK � �� \ � .1 � aNO.ST ff Wlawqtql �COUItt Of �i C:J �f 1 I I ll � � , w � J �j / t dwiw r� ♦ � � � / 10 tlIM ♦ � i � ` M 1 I :' \ I / / /�lO y��Nlr \♦ a �aQ�� , � �, � , � ,, . �r � � . /; � / ,,.o�� , / ,,,..�� /��, � � i � ei ai��san ` a V � / ��. ` suvrao�wa / �� p� � I � � OIIIfOfDOIIMO / , ' pll116I �� , • � � � wjz�,� I o � I I N 1 � � ~ ` y �4(r � [tiYd' i000 ��ei' � �M� [Aa tr art pr�iy w. I � � "v"��. � \ $ITE DATA ��O � ` Rr �� r 4 � °� r' =�� n�i..c��a �,/�� ' —— [ �' M — —— a�n oawa�P i �"°'u�' I � �� - i��m�� x ' � M ! [ _`__ ittORl�{MFO �`_'_ v, VF � --�-----"------��----- SHEET INDEX �� y�y" �z7 1 �� ________________ PRFLMN�RY 97E YPROWQI7 PLAN P1 ^7��; d�r__�___�____�_______ S101W ORAIN 0[lF]11�W SK1D1 O[TiLLi P] Z � ' � �iI1'IdD1�011 M��AI h� A � j I �� PRELIMINARY SITE IMPROVEMENT PLAN L �o� oa.o nr»aw.r�rr W o a � o,,,�,°��'a. -�;.. � �� .....,�.. ......�.,... � + 3 ��-� .....�..d ,�� ---�^- .A......�.� .� P-1 o�..�...,��.,.w. �0 2 �..��.. .�.,�,.�. ...ni.r ..�.. p RENTON CYCLE CENTER, RENTON, WA � A PORTION OF THE Sll/4 OF SEC. 30, TIIP 23N, RGE 5E, 11.M. t101NRW�O bOIM01 �S!IA!�10��10 tl��1 •V R MI[OA�tl�. i rm�vrMOtMCI�. .wMMl�*Y�NOIYMI �yp�D��y� �M�1D A�Mt�T q IA 11f 1 YM N T/� n I�1 O�y!�Y N1D pIyIIO Ml1f 8 AV 1i NM ■1!X�MZ■ � b��Nl Z� ' .:.�;,.,..::.._... ..�.=. .�--== � �1, .��"�° �, t`y^ - OMIRr�4Y1 fY �YMi 1�O �� " � � ruwrariw �w�� i w��nww wn �i�nuorrc o�a�a� Z �,�1 �av�a�e _ i�nw.iu■m qanrc+ue rw u •• Y nm�u nAe Y rMll�rlwert 11ra Iiwar-YRuw a� � �� Y 11oes M'�wl�aulm Ilmt iV oa�lU[ r�a�-�tl n�C•u�T U �� wR�1,�0011-1/Y OYIi oC[Mt CMR U'011 R�MYA tlW�6\�Y��IOwY�a0 �y. � YIE 1KR10110�9��Nl11/OM��t1OrLtl1A M1OIIYI[014�Mt11. CIIOII� I � * /'�O 111 MM W!M Y BM - 1!O-A MKl O W i� PItlVAIE PA1�D ORIYEMAT .-- � � e ,x,.,, z �s � —r t nm a'an �� o M � Z �� , �-o""/m�d' � ktl [n ! �~jp0� ' �r WOIY�I4RlM L '1[�1lN�M[!� ��1� � �,�,J � urrra�/� elRwrwia � ��'.g..;e.wa�rsnr. w��yu � �� rras�wlima �p � A�'.� ��{ O� /� �.� �w w CONII�OL OENCE. lEE T1fPE (FRaP-� '� � 0 � ` A `� - - _._� � _ V._---- —__- � _ ____._.. _,._ . .r----- r ___-�- --�_____ -- � a�o i � zW , ` : o�o,� � ....___ � _ __i.____ E„� i �z�� ` ; ' ; i d r�z� ta ' � ' � _._ �- _- , �pq � ; � � �a n�rw�aouuni..� ' p W G� n owa wr�rr��aa � a S, 1 � ' �2 r,.��'nn caru.x� ._.._ � _,_._ _.__._ _. s��.m � ,!E � �� i ,a i o -..� G�,� _, p ��a � , ,��«� t � z o� � . N iri�aeio ...I �'Tvo}row ��+ •or�x , �; �ip it a U �_.....[n01J1'M .__. �� ..j a� 7� � .. . Na15da1Mlf ,� [13tliff7M � � �y{Nqlt Oaf .Q RL1�i li!Ql � � � � � � 3 � i � i � a�n vow � � �.�... � � . ' .. . . _.. ..._I_._.. .._ � .....__L._ ..._e_...____.1. 1._._..._ .... . ..._......_. N � W� PR�E S1p01 ORANI OE1EN110p/wAIER aI�LITIf TqM( e �o ..�P-2 a 2 �► �1s�S �l .��an � �r�M 7y ��j —��aJ i :,� _� ;y � :S ,� I � � _ _ _ i Center Cycle, Renton, WA KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4.216 1 -INFO ON THIS PROGRAM 2-SBUHYD 3 - MODIFIED SBUHYD 4-ROUTE 5-ROUTE2 6 -ADDHYD 7 -BASEFLOW 8-PLOTHYD 9-DATA 10 -RDFAC 11 -RETURN TO DOS ENTER OPTION:2 SBUH/SCS METHOD FOR COMPUTING RUNOFF HYDROGRAPH STORM OPTIONS: 1 -S.C.S. TYPE-1A 2-7-DAY DESIGN STORM 3 -STORM DATA FILE SPECIFY STORM OPTION:1 S.C.S. TYPE-1A RAINFALL DISTRIBUTION ENTER: FREQ(YEAR), DURATION(HOUR), PRECIP(INCHES) 2,24,.67 __�___r____�w__�__�_�__WATER QUALITY STORM ""'**""****"**"'******S.C.S.TYPE-1A DISTRIBUTION*****"*""'"`*''*"***** ********"' .67-YEAR 24-HOUR STORM *'"'* .67"TOTAL PRECIP. "***'*"** ENTER: A(PER1n, CN(PERV),A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 0,90,.26,98,3 DATA PRINT-0UT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) I A CN A CN .3 .0 90.0 .3 98.0 3.0 ' PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) I .04 7.67 448 ENTER[d:j[path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: � C:IHYDIWQ.HYD ��n �� CrcliC I �Z �✓q s� -� - Page 1 o I Engenious s St�ms, Inc. Circular Section y Home Diam(ft or m): Toggle for SI/CTS Units �� 3 US Units Calculators Tahle incmmetlt i ft or m I: ' ��- 0.25 i f r To Width ft or H d Area sf or Depth (ft or Wetted Per m ( t o p ( y ( m} m) m) Radius sm} 0 0 0 0 0 0.2� 1.7571 1.6583 0.1601 0.?813 0.5 �- 2.5232 2.236-1 � 0.3069� 0.7744 0.7� 3.1416 �2._5981 � 0.4399 .3819'�� 1 3.6929 � 2.8284 0.5585 2.0626 125 421 � 2.958 0.662? 2.7878 1.5 4.71?4 -1r-3 -1 0.75 3.5343 1.75 5.?147 � 2.958 0.8209 4.2808 2 5.7319 2.8284 � 0.8734 S.00b � �5 �,�.. 6 ��3� � . -. --y 2.5 6.9016 � 2.23b 1 0.912 62942 � 7 ._fi6� I�b`��3""�" . 2 .78 I, 3 9.4248 � 0 -1 0.75 7.0686 '� This paye maintained by Engen_ious Svstems.Inc. � V 0�t!Y'�� w �� o c�ead s�ra p _ z,s ' � A+ �. 90 ' � /�= _�( vo1 = �,zg -3� x9� i _ ,� , � � 7,Zy,c50 =ZOZ3� .�3 � svrf�l� - v Z ' � g�c� ' I �lo f . � r o e,v$ %p��e j � �� d�� S{�ra�t pt� � ��'�'�1y S�/t� � / i USl° 7� �� bit SD �r `�'Q R�,�, �o�{ http://www.engenious.netlEsiHome/Caic/CircShape.asp 2/10/2004 !3 �en�er �Yc% 1`� �XiSti n, � �Fve �oP-c� ��c�ra9.a�p�, 5 Center Cycle, Renton, WA KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4.21 B 1 - INFO ON THIS PROGRAM 2 - SBUHYD 3- MODIFIED SBUHYD 4 - ROUTE 5 - ROUTE2 6 -ADDHYD 7 - BASEFLOW 8 - PLOTHYD 9 - DATA 10- RDFAC 11 - RETURN TO DOS ENTER OPTION: 2 SBUH/SCS METHOD FOR COMPUTING RUNOFF HYDROGRAPH STORM OPTIONS: 1 - S.C.S. TYPE-1A 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S.C.S. TYPE-1A RAINFALL DISTRIBUTION ENTER: FREQ(YEAR), DURATION(HOUR), PRECIP(INCHES) 2,24,2 '"""***""*****""`*"* S.C.S. TYPE-1A DISTRIBUTION "'"`**'`*'`"'`*""**'`'`** *"**"*""* 2-YEAR 24-HOUR STORM '"k"* 2.00" TOTAL PRECIP. *'"'*'"`*** --------------------------------------------------------------------- ENTER: A(PER�, CN(PERV), A(IMPERV}, CN(IMPER�, TC FOR BASIN NO. 1 ' .68,91,.16,98,37.6 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .7 91.0 .2 98.0 37.6 2Y '' Cx PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .17 7.83 3874 ENTER [d:j[pathJfilename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: c:lhydl2e.hyd !S Ce•.�-�e- ��c,.�� Center Cycle, Renton, WA SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S–STOP c ---------------------------------------------------------------------- ENTER: A(PERV), CN(PER�, A(IMPER1n, CN(IMPERV), TC FOR BASIN NO. 2 .18,90,.66,98,4.1 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MtNUTES) A CN A CN .8 .2 90.0 .7 98.0 4.1 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .40 7.67 4966 2`' `� E.v — ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: c:lhydl2d.hyd SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S–STOP n STORM OPTIONS: 1 - S.C.S. TYPE-1A 2 - 7-DAY DESIGN STORM 3- STORM DATA FILE � SPECIFY STORM OPTION:1 I S.C.S. TYPE-1A RAINFALL DISTRIBUTION ENTER: FREQ(YEAR), DURATION(HOUR), PRECIP(INCHES) 10,24,2.9 ---------------------------------------------------------------- *�"*"*""**'""""`*"'*S.C.S. TYPE-1A DISTRIBUTION '`**"*""*'`"'**'*"***** *'`*""""`' 10-YEAR 24-HOUR STORM '`*"` 2.90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPER�, TC FOR BASIN NO. 1 .68,91,.16,98,37.6 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .7 91.0 .2 98.0 37.6 f�'a Y :•�- � ,� PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .30 7.83 6376 �"'� -� �F c�. �� 4 � �� Center Cycle, Renton, WA ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: C:1hyd110e.hyd SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOPc ------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPER�, TC FOR BASIN NO. 2 .18,90,.66,98,4.1 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .2 90.0 .7 98.0 4.1 �Q � _/� � Y Gt PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .61 7.67 7631 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH:C:1hyd110d.hyd SPECIFY: C -CONTINUE, N - NEWSTORM, P - PRINT, S - STOPn STORM OPTIONS: 1 -S.C.S. TYPE-1A 2- 7-DAY DESIGN STORM 3-STORM DATA FILE SPECIFY STORM OPTION: 1 S.C.S. TYPE-1A RAINFALL DISTRIBUTION ENTER: FREQ(YEAR), DURATION(HOUR), PRECIP(INCHES) 25,24,3.4 ------------------ -------------------------------------- """""""`"""""`*x*"""`S.C.S. TYPE-1A DISTRIBUTION ""***""""*"�*'`*'`"*"* i ""***'�""` 25-YEAR 24-HOUR STORM `*"` 3.40"TOTAL PRECIP. "'`**"'`**" --------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPER�, CN(IMPERV), TC FOR BASIN NO. 1 �I .68,91,.16,98,37.6 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .7 91.0 .2 98.0 37.6 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 2�7 r � I .37 7.83 7811 I �--- ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH:C:1hyd125e.hyd � SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S—STOP c , �� C'e..,�Le.. Cy�.�+c Center Cycle, Renton, WA -------------------------------------------------------------------- ENTER: A(PER�, CN(PERV), A(IMPERV), CN(IMPER�, TC FOR BASIN NO. 2 .19,90,.66,98,4.1 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .9 .2 90.0 .7 98.0 4.1 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) Z`� � � Cf Q�d� .74 7.67 9212 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: c:lhyd125d.hyd SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOPn STORM OPTIONS: 1 - S.C.S. TYPE-1A 2 - 7-DAY DESIGN STORM 3 -STORM DATA FILE SPECIFY STORM OPTION: 1 S.C.S. TYPE-1A RAINFALL DISTRIBUTION ENTER: FREQ(YEAR), DURATION(HOUR), PRECIP(INCHES) 100,24,3.9 **""""""'"'*""`**"""*""S.C.S. TYPE-1A DISTRIBUTION '*'*:*****"********" ****`*"** 100-YEAR 24-HOUR STORM ""`*" 3.90" TOTAL PRECIP. '**'**'`" ---------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 .68,91,.16,98,37.6 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .7 91.0 .2 98.0 37.6 �� v y � P �( PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .44 7.83 9263 ENTER [d:][pathjfilename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH:c:lhyd1100e.hyd SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S—STOPc 18 Center Cycle, Renton, WA ---------------------------------------------------------------------- ENTER: A(PERV), CN(PER�, A(IMPER�, CN(IMPERV), TC FOR BASIN NO. 2 .18,90,.66,98,4.1 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .2 90.0 .7 98.0 4.1 /O!� y ��K � C�-t°v PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .85 7.67 10628 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: c:lhyd\100d.hyd SPECIFY: C -CONTINUE, N - NEWSTORM, P - PRINT, S -STOP s !��,� �� yr f - �� -� • JOB ' THE RYKELS ENGINEERING GROUP, INC. 28301 183rd Avenue SE SHEET NO. OF KENT, WASHINGTON 98042 CALCULATEDBY DATE CHECKED BV DATE SCALE ,. . _ _._ _ _ _..__...._ E,x ti ST►►ab Co�r�m v�s ' ' CN �T - 0. 8 �lac,. = 3C� , 5�D .� � �� - � �0�� t �' 4• ��a �� — `�S l actes s r•�) � � r�s.s " - Z 9,5/ S.s � - p. 6 8 :- 9/ ��O�/ �y�t �ts so � �1 vr�de- s-6 �'+ o�- �'� I( ��l��w��} ��.�, �; ,.,,.� - 3 �-, � ,�,,, ,��., S c e p,.� �+o.�� __ _._ _ ___ _ _ . . _. ; _ _ SCS 1�nP�; A C N T� Q� ` Z/z`I .., �, o i� /�.,�► Pe'' n,b$ ��'� 3�.b �p _ p,a�Zy . _ �,g 1 r��p 6 � I�_ � 8 _ _ _ �fzH - 3, y ___ _ _ ,; , -�io�,/2� � 3,�`j _ _ . H�o; �n p�,- �x x�� _ _ : , Qr � _ __ _ _ ._ _ _ _ 2� o � �� c�s _ .�..3 .�QI� t0 (�,,3o c �'s : _... _ _ _ _ __.. ___ _ _ ?..Sy _ 0. 3� C�'s _ l�6� . _ �, 1�� _._ __ __ ._ �t�? � Q� S►y �'�-� ___._.. _ .. :. _ _ _ __ : � _ . . _ __ . , : __ . .._ : __. ____ _ _ . . ;.. : er .�;_. __: i.. ..: . . . . _ , . �� . . ,- . . . ... PA09UC1 Zlu'ISIn9k SMMs:20.5�1 fPadkdl�g inc.Coto�Mass 0'.sT1 Tn CkAer PH7ME T01 FRFE��UZSE380 � ,ioe ' THE RYKELS ENGINEERING GROUP, INC. 28301 183rd Avenue SE SHEET NO. OF KENT, WASHINGTON 98042 CALCUTATED BY DATE CHECKED BV DATE SCALE . . '�e�e.�n�Q a Coao,-r �o�� T = D , �y�� _ �G , 55D A ��d s P�� _ �,S..d . g g � e �c P��t' _' 0./G a� 9Q ��rC!M'�5 f �� R�irJ c�,sCp� . I - .Sys'� ;� n " ZyZN � � i o� �� b �r � , �� L J� �ro�ve� J�i�l� � �. /r-) .� �e� fov,•��o �,�' ) _ _ S C..� I�p��- , - - - q c� �t _ ___ __ P�r a � � • _ o, � __ � �.�N��h, � �� p . bb °t $: _ _: __ }7�y p Qu��v f'. _ Pz�z� ' 2 .a '"/�� p — -� — �a/z� _ 2,S ; C�d�✓__ ; _ _ _ �2 rfzy __ -- ,�,y :. . . ; ... ° _ 2.f -' p , Ko �'s __ �iooJt�l 3•S _ � .. :_ �a�, — �,6< < F� ; _ __ ._ _ ZS "_ o ��Wc�s _ ` �" _ � _ . _ /�1� - � ,c� � r � , r � r�o�r�w-,,s�Sn�e,ms.�i^+�mQ.e�.c�o�.wsso„7i T,a�a��v�ou��ai�n�ieoo-rss�a � J08 � THE RYKELS ENGINEERING GROUP, INC. 28301 183rd Avenue SE SHEETNO. OF KENT, WASHINGTON 98042 CALCULATEDBY DATE CHECKED BV DATE SCALE __.. _. __. . __.. . . l�t�e� � a��4- - __ _ ;_. . _ ;_ _ : _ s��y .��+�` � K�Sw a �� . : _ ._ _ _ __ _ , ,: 5�� '��C R�eB - I �o : o �' � �� .��.. �� 14 = 0� 01 h D , 26 x �3sba '� _ -1 � � �� ` . . � , 2 , To r� � !/a/u .+�� o+� �Q s fo.-.,.�t ��.v g • _ /�z/2�� ' 3 ` Q'��" y '/3 , ; � _ _ peC.�� o� �4-+'�-a M-�• �� A t � �-` �-. � _ �S @__ � '^ � L� Lo"�4 r (�t/al_.�� +� � �� M�1pe-v�0v.`� �rPc?: �u �,�';� ��' �l��t�r� 'a" � '� � �� , �2� J� ". � '?6d� �'PVw+ Ohl�� P � _ _ C � = � � _ ; _ .: : _ : _ ;_ _ _ _ ._ . . _ - . �,� � 3 ,p ww � �, _ _ _ _ _ _ . . _ .___ ,._ _ __ _ __ _ ._ . . _ ... : _ _, _ . ,. . _ : � _ _ __ . __.. __: ..- _:._ : . 2Z MOC:ICT'1N-'ISdgk$t.i+h710.,`-'I°idOxf��lv ;�nl�r Vaa�,1d-.T^�"�'krPVui':Ei�LLF��.FL[_r.s.�, . , � KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5.2B SCS VVESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBEHS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type tA raiMal!distribution, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC SOiL GROUP IAND USE DESCRIPTION A B C D Cuttivated land(1�: winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed or older second growth 42 64 76 8t Wood or forest land: young second grawth or brush 55 72 8t�� 86 Orchard: with cover crop 8t � � � Open spaces, Iawns, parks, golf caxses, cemeteries. landscaping. good condition: grass cover on 75% or more of the area 68 80 86 90 fair condition: grass cover on 5096 _ to 75% of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 9t � , Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pevemeni, roofs, etc. 98 98 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 100 Single Famdy Residential (2) Dwelling Unit/Gross Ac�e 96 Imperviou.s (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA $4 , of the site or basin 3.5 DU/GA 38 " 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA � 48 5.5 DU/GA ' S0 6.0 DU JGA 52 6.5 DU/GA �4 7.0 DU/GA 56 Ptanned unit developments, 96 impervious condominiums, apartments, must be computed commercial business and industriai areas. (1) For a more detaaed description ot agricutt�al land use curve numbers refer to National Engineering Handbook Secfion 4, Hydrology, Chapter 9.August 1972. (2) Assumes roof and driveway runoff is dlrected into street/storm system. {3) The remaining pervious areas (lawn► are considered to be in good condition for these cucve numbers. .�� . � 3.5.2-3 , 11/92 ` z3 ��t _ �y ��. r �;+ ,� :., �, �, _ it 1 lV i� l. V U �� i Y, tiV A J ri i ir u i iJ iti, J U it r A l: � W !-1 1 t, K ll � 5 1 li iV IV1 A 1V U A L (2) CN values can be area weighted when they apply to pervious areas of similar CN's fwithin 20 , CN points). However, high CN areas should not be combined with iow CN areas iunless the !, !ow CN areas are less than 15% of the subbasin). In this case, separate hydrographs shoutd be �` generated and summed to form one hydrograph. � FIGURE 3.5.2A HYDROLOGIC SOIL GROUP OF THE SOILS IN KING COUNTY HYDROLOGlC HYDROLOGIC SOIL GROUP GROUP• SOIL GROUP GROUP* Aldervrood C Orcas Peat D Are�ts, Alde�nrood Material C Oridia D Are�ts, Everett Material B Oval1 C ' 8eausite C Plchuck C Bellingham D Puget D Briscot D Peryallttp B BucMey D Ragnar 6 Coastal Beaches Variable Renton D Eartmont Si7t Loam D Riverwash Variable Edgewick C Salal C Everett A B 'Sammamish D Indianofa A Seatite D Kitsap C Shacar D laaus C Si Silt C Mixed Alluvial Land Variabfe Snohomish D Neilton A Sultan C Newberg B Tukw�a D Nooksack C Urban Variable Normal Sandy Loam D Woodinv�lte D HYDROLOGIC SOIL GROUP CLASSIFlCATIONS A (Low runoif poterrtial). Sois having high ir�fAtratan rates. even whe�thoroughty wetted, and consisting ch9efly of deep,w�l-to-excessively drained sands or grav�s. These sois have a high rate of water transmission. B. (Moderately low rur►off potential). So�s having moderate inf'�Itration rates when thoroughty wetted, and consisti�g chiefly of moderately fine to moderately coarse iextures. These sods have a moderate rate o# water transmission. C. (Moderatety high runoff potentia�. SoOs haviRg slow tnf�iration rates when thoroughiy weited, and consisting chiefly of sods with a laye�that impedes dauvrnnrard movement af water, or so�7s with moderatety i'ine to fine te�dures. These sdts have a slow rate of water transmission. D. (High runof�poter�tial). Sois t�aving very slaw infltration rates when thoroughfy wetted and consisting ' chiefly of day sods with a high swelling pote�tial, so�s with a permanent high water table, sals with a hardpan or day tayer at or near the surface, and shaliow soas over neariy impecvious materiat. These sols have a very slow rate of water transmission. « From SCS, TR-55, Second Edition,June t986, Exhibit A-1. Revisions made from SCS, So� Inierpretation ' Record, Form #5, September 1988. 3.5.2-2 � 11/92 � 2 y �'P.��r— c�c r d Z.�ps.I,. �" _ :, .�s „ 4,~ r7�� J =S . � h�09'� _ �� t�a��PaS' 4 � a, �! '�t� � �'�� . - ._ y 9'4/ / . �t s o � �a��' as� � 'f°N ,o�� 006 + . � _�, ' �,'+�'+, �, 0 aS� � a�� `✓) r �z'� — i � . � . y �� tiz =� � �,Z =� Q� 5 ,� �1 �9� �' 9 '0/ _._ _ o� _ r s�'/ � 'v` � � �..� ,,.� c� �.� 1 � •--a u,-, „�a S --� e �F,;� �� .� N�` �° `'' Ad� �� ' s�� ' ._,, s, . ' � � `' �f- � '�.`'n � � �.�M,a� a9 � ��.�� paS' �O -J.�- .:e.. �a��.�s u.w � t � �� - �S � � ' 0'� ` � - �� t� x c� 8 �Z �- '� S fo � ��/Z�,� s� . = �S ��'�� . , .. �� :� _ �,�� J � tl� � ac 1a } 1:--- J w�}�J� S