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Home My WebLink About02807 - Technical Information Report , : . .$ �� . � � �` �.` � STORM DRAINAGE COMPUTATIONS for TRISH JOHNSON HOLM SHORT PLAT (808 - 824 SVV 4TH PLACE) in THE CITY OF RENTON August, 1999 � I G. R. (BOB) PARROTT, P.E. 3924 - 204TH STREET SW, LYNNWOOD, WA. 9803G Ph. 425 - 778-0987 Fax 425 - 778-6892 , � �,PARR�T v'aF w�s r �� ' o ti � x �t, 11205 o RFcrs[�� SIONAL rcr'v�' �PIRES /�-3- '. . . , I STORM RUNOFF COMPUTATIONS . . • �i . ��2b ''i �i.�/Siy Tv�'^�5 a�.J /�'oG M , -- 1!� STo�PM 2U�OF.� G�4ivi✓�G�i A TiO�s .+; ---. �t ��C�.STi�✓�' �OND�Tivi✓S i�i ;.; To�-�� ,:-� �.�a_ _ � 35 ,4-� . �s8_�� 5�� :,, f�.� y�.z�.�-.-� -�--��.�Y�� ,�,00� ; /a� Lu.��? ��c Z .+} So�7�7 Go��l.� /f3 $Gc��Or�� iS//r� `/D_�rScS G�/i�/P'vG'i✓� -- / ,� U!f=�l /✓I TO ��i G Sy,S�G,�,� i� SG�/ � -�'/��QC,G. . �o f�2� ;i� iJt � :�; �l�t�Q. �ii Cd-y,-cP U / ��,e�.s�� — �x Clu-c�¢. �ro�0 os GG� (.�x�,.) i� � i P�,D = �.ZB�;: �afs � { ¢. � = 2 0 � �v � �„1;�� - s� 997 - s�iz - sso� = 47, �77 �� z.9 :t = /�o ,� . ;�, ,o� _ �-9 ;i! 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'� '��/�` � ��`' ' / - ►�� . � _ , .� �� , /�. � L � I � � � 1_ � / • ♦ ``� '�y,� /`, � ��y � . _ , �� `. „. �� f ` � ; �� _ �' - -� �� . . � �. :,� � � , , .��. ,�,� - �_� �` . �. � � �-�►• . � !�� , � � � � � � . . _ �..�,,, � � O �.� � - v - . �, �� . � . �. ._� �. e � ��i� �` �� / o � , \ � � � �, � ��n��.,, . ��\ � �. ��. ':"' .,� �* � . . : ��_ � ��,�� '�'''�`�►�`— ��, '� � � � -; . ,� . w_ � •�� '� ;`� \ � ��' � � / _�� ` ` ��/ _ � 1 �� . � �� .�A11' �e� , .�,s�t��t � � �� , -��► + �� , ��, ��. .�. � � y - � - ��I�► ��1� � ,� �� r : �� . �� "' � ---� � a�w�w� )�� .�. ��. '� . -� � � ,I��1' -_ � ' ,�-0 ` �. ,� � ��i�' ; �� -��„�`� i � � � .o �' . � � . ` . � ./� �" � , '-- ' •' • � �'ir��;� � � . - . . . . . . . . � �,�� • � . - . �� • , ' ��%�' . • � . � � � . : F • • - —� --_--- ► ` , .. ... .� . . . KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL (2) CN values can be area weighted when they apply to pervious areas of similar CN's (within 20 '''r�� CN pointsl. However, high CN areas should not be combined with low CN areas (unless the � low CN areas are less than 15% of the subbasin). In this case, separate hydrographs should be generated and summed to form one hydrograph. FIGURE 3.5?A HYDROLOGIC SOIL GROUP OF THE SOILS IN ICING COUNTY HYDROLOGIC FiYDROLOGIC SOIL GROUP GROUP' SOIL GROUP GROUP` Aldervvood C Orcas Peat D Arents, Alderwood hlater'�al C Oridia D Arents, Everett Material � Ovall C Beausite Pilchuck C Bellingham D Puget D Briscot D Puyallup B Buckley D Ragnar B. Coastal Beaches Variable Renton D Earlmont Sili Loam D Riverwash Variable Edgewick C Salal C Everett A/B �Sammamish D Indianola A • Seattle O Ki[sap C Shacar D Klaus C Si Sitt C Mixed Allwial Land Variable Snohomish D Neilton A Sulian C Newberg B Tukwila D �' ' Nooksack C Urban Variab(e y� Normal Sandy Loam D Woodinville D HYDROLOGIC SOIL GROUP CIASSIFICA710NS A. (Low runoff potential). Soils having high infiltration rates, even when thoroughly wetted, and consisting chiefly of deep, well-to�xcessively drained sands or gravels. These soils have a high rate of water transmission. B. (Moderately low runoff potential). Soils having moderate infiltration rates when thoroughly wetted, and consisting chiefly of moderately fine to moderately coarse textures. These soils have a maierate rate of water transmission. C. (Moderately high runoff potentiai). Soils having slow infiltration rates when thoroughly wetted, and consisting chieHy of sols with a layer that impedes downward movement of water, or soils with moderately fine to fine textures. These sols have a sJow rate of water transmission. D. (High runoff potentiatj. Soils having very slow infil:ration rates when thoroughly wetted and consisting chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a hardpan or cJay layer at or�ear the surface, and shallow soils over nearly impervious material. These soils have a very slow rate of water transmission. ' From SCS, TR-55, Seco�d Ed'Rion, June t936, Ezhibit A-t. Revisions made from SCS, Soil Interpreation Record, Form #5, September 1988. i ��, 3.J.2-2 11/92 aG'' KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5.2I3 SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS � - SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selecied agricultural, suburban and urban land use for Type tA rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY ! HYDROLOGIC S ROU? I IAND USE DESCRIPTION A B � D ' Cultivated land(t): winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 89 92 Meadow or pasture: 65 78 SS 89 Wood or forest (and: undisturbed or older second growth 42 64 76 81 Wood or forest land: young second growth or brush 55 72 1 Orchard: with cover crop 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, � landscaping. good condition: grass cover on 75% ' �3 or more of the area 68 80 � 90 FOQEjc�� fair condition: grass cover on 50°� to 75°k of the area 77 SS 90 92 � Gravel roads and parking lots 76 85 89 91 Dirt roads and parking lots 72 82 8� 89 impervious surfaces, pavement, roofs, etc. 98 98 9 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 t00 Single Family Residential (2) Owelling Unit/Gross Acre °,G Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selecteti 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/C'aA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA SO 6:0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA 56 Planned unit developments, °�6 impervious condominiums, apartments, must be computed commercial busi�ess and industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9. August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. � � 3.5.2-3 11/92 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.S.ZC "n" AND "k" VALUFS USED IN TINiE CALCULATIONS FOR HYDROGRAPHS •�;sn�FloM,eq��b�tiw��s v��o.cna ww 30o n a uar�� . Srt�ooth suAaces(concrete,asphall,pravq,or bare hard packed soi) p.p11 Fallow fields or loosa so1 s4rlace(no resldue) 0.0.5 CVlivated sol with residue cover(s <.0.20 h/ft) 0.06 CultMated so1 wah residue cwer(S>O.ZO 1t/h) 0.17 ----�� Short prairie p2ss an0 lawru o.�5 Oense yrasses 0.2� Bermuda grass O.at Ranpe(natural) 0.19 Woods or lorast whh Iigh[underbrush 0.�0 Woods or brest wRh dense underbrush 0.80 'M3nning v2lues tot sheel flow oNy.hom Ovenon and Meadov+s 1976(Sae TR-55. 1986) 'IC Values UseO In Travel Time/Time d Concerwation Calculations Shallaw Concentraled Flow (Alter th�inillal 700 fC d st�ae[Ilow.R �0-1) k, 1. Foreu with lieavy ground lafer and meadows(n.0.10) S 2. Bnuhy 9round with sane vees(n�0.060) S 3. Fallow or minimum Ulape culUvalion(n .0.040) 8 �. Hi9h qrass(n.0.035) � S. Short prass.Pasiure and taw�s(n.0.OJ0) 11 4. NeaAy bare pround(n-o.025) 1J 7. Paved and pravel areas(n.0.012) 27 Charoiel Flow(IrnermitteN)(At tAe beqwxrrg d visi0le channels:R.0.2� k� 1, fWested iwOIB wah heavy qrax�d lilter(n =0.10) S 2. forested dninaqe course/rav�ne wnn defined channel bed(n.0.050) �0 3. Rock-14ied walorway(n-O.OJS) �5 �. Grassed waierway(n.0.0.70) t 7 5. EanMined waterway(n-0.025► 20 6. CMP pipe(n-0.02s� 21 7. Concrele pipe(0.012) � 8. Othe�vrate�ways and pipes O.SOB/n Chamel fbw(CoN4�uous siream.R -0-t) k. 9. Meanderinq siream wlth same pods(n-O.WO) 20 10. Hockained stteam(n�0.035) 23 tt. Grass-lined stream(n.0.OJ0) 27 12. Other streams,marrmade channels and pipe O.B07/n•• ••See Chapter 5.Tade 5.3.6C lor add'qbnal Wnn4+qs'n'values ta ope�channels 3.5.2-7 1� HY� .$i O.eM /�Ui✓OF!-% G'�7M,0 UTA i/d i✓S �wST/.�%� �'or✓p�T/D�✓5 KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4 .21B 1 - INFO ON THIS PROGRAM —� 2 - SBUHYD 3 - MODIFIED SBUHYD 4 - ROUTE 5 - ROUTE2 6 - ADDHYD 7 - BASEFLOU� 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-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S.C. S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES) 2 , 24, 2 . 0 ----------------------------------------------- - - - -- - -------- -------- - ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 2-YEAR 24-HOUR STORM **** 2 . 00" TOTAL PRECIP . ********* -------------------------------------------------------------- -------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 1 . 10 , 83 , 0, 98, 13 . 2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES) A CN A CN 1 . 1 l . l 83 . 0 . 0 98 . 0 13 . 2 PEAK-Q (CFS) T-PEAK(HRS) VOL(CU-FT) �"�2 �� . 14 7 . 83 2769 �l ENTER [d: ] [path] filename [ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: A: 9926E2 SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP N STORM OPTIONS: 1 - S .C.S . TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S.C. S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES) 10, 24, 2 . 9 ---------------------------------------------------------------------- ******************** S .C.S. TYPE-lA DISTRIBUTION ******************** ********* 10-YEAR 24-HOUR STORM **** 2 . 90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 1 . 10, 83 , 0, 98, 13 . 2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES) A CN A CN 1 . 1 1 . 1 83 . 0 . 0 98 . 0 13 . 2 PEAK-Q (CFS) T-PEAK(HRS) VOL(CU-FT) . 32 7 . 83 5446 �a C>C/s% ENTER [d: ] (path] f i lename [ .ext] FOR STORAGE OF COMPUTED HYDROGR.APH: A: 9926E10 SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP N STORM OPTIONS : 1 - S .C. S. TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S . C. S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES) 100, 24, 3 . 9 - - ------- ------------------ --- ----------------- - - -------------------- - ******************** S .C.S . TYPE-lA DISTRIBUTION ******************** ********* 100-YEAR 24-HOUR STORM **** 3 . 90" TOTAL PRECIP. ********* -- ------------------------------------------------------- - - - - - ------ - - ENTER: A (PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN N0. 1 1 :10 , 83, 0, 98, 13 .2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINVrES) A CN A CN 1 . 1 1 . 1 83 . 0 . 0 98 . 0 13 .2 PEAK-Q (CFS) T-PEAK(HRS) VOL(CU-FT) . 56 7 . 83 8768 �i ao ��s� ENTER [d: ] [path] filename [ .ext] FOR STOR.AGE OF COMPUTED HYDROGRAPH: A: 9926E100 hyd STo�2/l,j /�'G..✓OFF �'OM,o1.�T�^fjon/3 ��/E Go��.� GOi✓O i T i oi✓� KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGR.AMS Version 4 .21B 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-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: ' 1 S . C. S . TYPE-lA R.AINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES) 2 , 24 , 2 . 0 ------ -- - ----------------------------------------- ----------- --------- ******************** S .C.S. TYPE-lA DISTRIBLTTION ******************** ********* 2-YEAR 24-HOUR STORM **** 2 . 00" TOTAL PRECIP. ********* -- -------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN (IMPERV) , TC FOR BASIN NO. 1 0 . 55, 86, 0 . 55, 98, 7 . 8 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES} A CN A CN 1 . 1 . 6 86 . 0 . 6 98 . 0 7 . 8 PEAK-Q (CFS) T-PEAK(HRS} VOL (CU-FT) . 36 7 . 83 5236 �2 OE✓EG. . ENTER [d: J [path] filename [ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: a: 9926d2 Not ready reading drive A Abort, Retry, Fail?r FILE ALREADY EXIST; OVERWRITE (Y or N) ? Y SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP n STORM OPTIONS: 1 - S . C.S . TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S .C.S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES) � 10 , 24, 2 . 9 -- -------------------------------------------------------------------- ******************** S .C.S. TYPE-lA DISTRIBUTION ******************** ********* 10-YEAR 24-HOUR STORM **** 2 . 90" TOTAL PRECIP . ********* - - ----- --------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 0 . 55, 86, 0 . 55 , 98, 7 . 8 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES) . A CN A CN 1 . 1 . 6 86 . 0 .6 98 . 0 7 . 8 PEAK-Q (CFS) T-PEAK(HRS) VOL (CU-FT) . 60 , 7 . 83 8475 �jr� ��L� ENTER [d: ] [path] f ilename [ .ext] FOR STORAGE OF COMPUTED HYDROGR.APH: a: 9926d10 FILE ALREADY EXIST; OVERWRITE (Y or N) ? Y SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP n STORM OPTIONS : 1 - S .C. S. TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S . C . S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ (YEAR) , DURATION(HOUR) , PRECIP (INCHES) io-o, a4, 3 . 9 -- - -- - ---------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBU'TION ******************** ********* 100-YEAR 24-HOUR STORM **** 3 . 90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN NO. 1 0 . 55, 86, 0 . 55, 98, 7 . 8 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC (MINUTES) A CN A CN 1 . 1 . 6 86 . 0 . 6 98 . 0 7 . 8 PEAK-Q (CFS) T-PEAK(HRS) VOL(CU-FT) . 87 7 . 83 12218 �oa DE�EL ENTER [d: ] [path] filename [ .ext] FOR STOR.AGE OF COMPUTED HYDROGRAPH: a: 9926d100 FILE ALREADY EXIST; OVERWRITE (Y or N) ? Y SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP n STORM OPTIONS: 1 - S .C.S. TYPE-lA 2 - 7-DAY DESIGN STORM 3 - STORM DATA FILE SPECIFY STORM OPTION: 1 S.C. S . TYPE-lA RAINFALL DISTRIBUTION ENTER: FREQ(YEAR) , DURATION(HOUR) , PRECIP (INCHES) 1, 24, 1 .28 ---------------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 24-HOUR STORM **** 1 .28" TOTAL PRECIP. ********* �O/-�� - --------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) , TC FOR BASIN N0. 1 0 .55, 86, 0 . 55, 98, 7 . 8 DATA PRINT-OUT: AREA(ACRES} PERVIOUS IMPERVIOUS TC(MINU'I'ES) A CN A CN 1 . 1 . 6 86 . 0 . 6 98 . 0 7 . 8 PEAK-Q (CFS) T-PEAK(HRS) VOL(CU-FT) . 19 7 . 83 2827 �G ry», j��✓E� .� ENTER [d: ] [path] filename [ .ext] FOR STORAGE OF COMPUTED HYDROGRAPH: a: 9926d. 5 FILE ALREADY EXIST; OVERWRITE (Y or N) ? v DETENTION SYSTEM COMPUTATIONS . , ' . -- ,O�T�i✓T/O� ��ELEi15E GPiTG-.,e/� � _ -- --- - - --- -- �E��c�/ �o% �".Nc.q25Eit+E�/f I --------- ------- /'it/FGal,J �ELEi15� �'�TU�L iQELE�1 SE � - -- ---- � �. �€✓tL : D��c�s �z �.�s r = ��¢�.� o.i3 �{'S --- -- ._._ �r� l��v�= o.�o �eo �'x�sr = o- 3 z� a- Z Z _ -- �iaa Q�/F.�.: O• g J �iar>6"cX.sT= O•5./� l- S o , �_- . - _ _ _ _ ;;I _- —-;-- � �_�G 1��9uLT �e �� B '�✓� ¢ ��✓� sTo,ei+-�� /1�r�. -- - - _-� 8€� �2 �/DL= Z/�:� ��T 3 �L��E 5i D,es�� . _ ,�a��r� va�. �� 'r3 �r. -._ -- iZ'� �.3� � -- D�4iFiGE t�Z- 3-3/ �� i 2'�� .__ i z��,x �- 2' „ --� �D�..��cE �'/ = 2•v/ � .. s�E ,�R,,��ou�s �v��a c.i,.�y • r �1� I�E T�.✓T/D� 1��9 u LT �'a��PGlTA i�J�✓5 KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4 .21B 1 - INFO ON THIS PROGR.AM 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: 10 R/D FACILITY DESIGN ROUTINE SPECIFY TYPE OF R/D FACILITY: 1 - POND 4 - INFILTR.ATION POND 2 - TANK 5 - INFILTR.ATION TANK 3 - VAULT 6 - GRAVEL TRENCH/BED 3 ENTER: EFFECTIVE STORAGE DEPTH (ft) BEFORE OVERFLOW 4 . 0 ENTER [d: ] [path] filename [ .ext] OF PRIMARY DESIGN INFLOW HYDROGRAPH: A: 9926D100 PRIMARY DESIGN INFLOW PEAK = .87 CFS ENTER PRIMARY DESIGN RELEASE RATE (cfs) : 0 . 56 ENTER NUMBER OF INFLOW HYDROGRAPHS TO BE TESTED FOR PERFORMANCE (5 MAXIMUM) : 2 ENTER [d: J [path] f ilename ( .ext] OF HYDROGRAPH 1 : A: 9926D2 ENTER TARGET RELEASE RATE (cfs) : 0 . 14 ENTER [d : J [path] filename ( . ext] OF HYDROGRAPH 2 : A: 9926D10 ENTER TARGET RELEASE R.ATE (C f S) : r • � 0 .32 ENTER: NUMBER OF ORIFICES, RISER-HEAD (ft) , RISER-DIAMETER(in) 2, 4 . 0, 12 RISER OVERFLOW DEPTH FOR PRIMARY PEAK INFLOW = .20 FT SPECIFY ITER.ATION DISPLAY: Y - YES, N - NO N SPECIFY: R - REVIEW/REVISE INPUT, C - CONTINUE C INITIAL STORAGE VALUE FOR ITERATION PURPOSES: 4206 CU-FT BOTTOM ORIFICE: ENTER Q-MAX(Cfs) 0 . 22 � DIA. = 2 . 01 INCHES TOP ORIFICE: ENTER HEIGHT(ft) 2 . 69 DIA. = 3 . 31 INCHES PERFORMANCE: INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE DESIGN HYD: . 87 .56 .56 4 . 00 1625 TEST HYD 1 : . 36 .14 . 14 1 . 67 670 TEST HYD 2 : . 60 . 32 .32 2 . 93 1190 � SPECIFY: D - DOCUMENT, R - REVISE, A - ADJUST ORIF, E - ENLARGE, S - STOP E ENLARGEMENT OPTION: ALLOWS FOR INCREASING STORAGE AT A SPECIFIED STAGE HEIGHT, TO PROVIDE A FACTOR OF SAFETY. ENTER: STORAGE-INCREASE (%) , STAGE-HEIGHT(ft) 30, 4 . 0 PERFORMANCE: INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE DESIGN HYD: . 87 .56 .50 3 . 62 1914 TEST HYD 1 : . 36 .14 . 13 1 .43 750 TEST HYD 2 : . 60 .32 .22 2 .73 1440 SPECIFY: D - DOCUMENT, R - REVISE, A - ADJUST ORIF, E - ENLARGE, S - STOP D PERFORMANCE : INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STOR.AGE DESIGN HYD: . 87 .56 .50 3 . 62 1914 TEST HYD l : . 36 . 14 . 13 1 . 43 750 TEST HYD 2 : . 60 .32 . 22 2 . 73 1440 STRUCTURE DATA: R/D-VAULT RISER-HEAD VAULT-BOTTOM-AREA STOR-DEPTH STORAGE-VOLUME 4 . 00 FT 528 .8 SQ-FT 4 . 00 FT 2115 CU-FT DOUBLE ORIFICE RESTRICTOR: DIA(INCHES) HT(FEET) Q-MAX (CFS) BOTTOM ORIFICE: 2 . 01 . 00 . 220 TOP ORIFICE : 3 . 31 2 . 69 . 340 ROUTING DATA: . � STAGE (FT) DISCHARGE (CFS) STORAGE (CU-FT) PERM-AREA(SQ-FT) . 00 . 00 . 0 . 0 . 40 . 07 211 . 5 . 0 . 80 . 10 423 . 0 . 0 1 . 20 . 12 634 .5 . 0 1 . 60 . 14 846 .1 . 0 2 . 00 . 16 1057 . 6 . 0 2 . 40 . 17 1269 . 1 . 0 2 . 69 . 18 1422 . 4 . 0 2 . 80 .28 1480 . 6 . 0 3 . 20 .41 1692 . 1 . 0 3 . 60 .49 1903 . 6 . 0 4 . 00 .56 2115 .2 . 0 4 . 10 . 88 2168 . 0 . 0 4 . 20 1 . 46 2220 . 9 . 0 4 . 30 2 .21 2273 . 8 . 0 � 4 . 40 3 . 01 2326 . 7 . 0 4 . 50 3 . 31 2379 . 6 . 0 AVER.AGE VERTICAL PERMEABILITY: . 0 MINUTES/INCH SPECIFY: F - FILE, N - NEWJOB, P - PRINT IF/OF, R - REVISE, S - STOP � . WATER QUALITY COMPUTATIONS ��t �(; � t,� ��. ,: � �i: ii' �i� ,i. .;' i:. +�: �;` :;. 1: }t' i.: li; ii �' �t. i j!'. }}• 1._ �i i:. E� -. _ }1: i� f j '�,iQ � _/� g �Z�Z _ �;' �c/�� Z.5 T/M�� 7(�i �� _ O�G7�/�a�� ?Q� i.. . ;,. "51 rro!n��a'c� snQ�j��'�� S ',�. � 1� Lz � Z = �r�� /iU�r�a� ��3o a-.-�o,�-� ", �z ��n�ov�� p ��h�O/J = 7 O/J "3�P/�1�1�" 1�N6�/�U'�� :: i;. "3��Q�S �/r�7 /v�'r1N�1�p� �� 9f�1 M�717�/ � ��dra'�1 S �'/�� 5J7 P/ �S��Q'�'�/ �� : �/ 'i 'S1N'�6�`r.'�1`vo.7 �7l/-'d-b'a'�✓'odo_/ �� .97G� �f�7�1�-�/�'�1 �O/t� �Ti �' T} 5/ 1h� '��/�a'is�p 1 s��,i SJ ��E//'� /"Qc1!-ia'1�!-/a>� � �; �;; _ ,i :� �1 r-r�i� ��lb/� - -- .I� ;� � . . � .. D. R. STROIVG Consulting Engineers Inc. � s 4 . _ _ 1060 N.E. 38TH PLACE, SUITE 101 KIRKLAND,WA 98033 7903 (425) 827 3063 •TOLL FREE (V1lashington State) 1-800-962-1402 • FAX N U M B E R (425) 827-2423 May 24, 2000 00146.100 Paul Lumbert City of Renton 1055 South Grady Way Renton, WA 98055 Re: SW 4"' Place Short Plat LUA-98-091-SHPL Dear v1r. Lumbert: DRS has completed design revisions for the above referenced project at the request of the Owner's representative, Ms. Patricia Johnson-Holm. `�'e revie�ved the downstream path and did not observe any problems with the downstream conveyance system, ��ith one exception. We �vere unable to locate the storm drainage structure on the south margin of Sunset Way, which apparently receives runoff from the site's natural discharge point. However, at our request, City of Renton staff performed a dye test which confirmed that site runoff is conveyed southeast beneath SW Sunset Boulevard. The runoff is then conveyed into the inventoried drainage system that provides the downstream path for the site. According to the previously prepared Technical Information Report, the proposed project site post-developed peak runoff rate far the 100-year, 24-hour duration design storm event is 0.87 cfs. The pre-developed peak runoff rate for the same design storm is 0.56 cfs. Since the increase is less than 0.5 cfs, the project is exempt from Core Requirement #3 — Runoff Control, per Section 1.2.3-5 of the 1994 King County Surface Water Design Manual. We have therefore redesigned the vault as a water quality facility located beneath the planter strip. The vault collects runoff from the site impervious surfaces subject to vehicular traffic (driveways and access road). Revised hydrologic calculations for the water quality design storm are included (see attached). The new sidewalk will be located south of the right-of-«ay line, with the landscape strip adjacent to the curb and gutter. The new 8-inch water main will be located adjacent to the right-of-way line, in approximately the same location as the existing 4-inch water main. . . . If you should have any questions regarding the design revisions, please give me a call. Sincerely, D. R. Strong C�nsniting Engineers Inc. �-- ��-, �-� -- J�� Luay R. Joudeh, P.E. Principal Attachment cc: Patricia Johnson-Holm T:�k00�1 i00146�100'�L000514 il ' • � 00/�(o,/I�o 1,�24, .67 ---------------------------------------------------------------------- ******************** S.C.S. TYPE-1A DISTRIBUTION ******************** ********* ' `�� 24-HOUR STORM **** .67" TOTAL PRECIP. ********* 6-MoNTH ---------------------------------------------------------------------- ENTER: A(PERV) , CN(PERV) , A(IMPERV) , CN(IMPERV) : l: � u�� r�>i N P��:_� . 1 ' .55,86, . 55$98,�- DATA PRINT-OUT: I! AREA(ACRES) L�L:� �...._, �.i� 1:�.. i,;:.� ��.��,��v� I�I A CN A CN �i 1 .1 . 6 86.0 .6 98.0 � !I PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT ; II .07 7.83 1068 ; ENTER [d: ] [path]filename[ .ext] FOR STORAG�; �F C�NiFliIEL HYDRuGkA1 i a:\146po6 SPECIFY: C - CONTINUE, N - NEWSTORM, P - PRINT, S - STOP s KING COUNTY DEPARTMENT OF PUBLIC WORKS Surface Water Management Division HYDROGRAPH PROGRAMS Version 4 . 21B 1 - INFO ON THIS PROGRAM 2 - SBUHYD 3 - MODIFIED SBUHYD 4 - ROUTE 5 - ROUTE2 6 - ADDHYD 7 - BASEFLOW $ - PLOTHYD 9 - DATA 10 - RDFAC 11 - RETURN TO DOS ENTER OPTION: �