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HomeMy WebLinkAbout03138 - Technical Information Report - Drainage BAIMA & HOLMBERG INC. /����� � � 3/3g � DRAINAGE REPORT for Pacific Heights on Sunset July 17, 2003 '�E✓iSE� 6�5�03 '�✓�sED to�3� 3 �uc s�o �lzr p y c�xU PE F �'AS � wo � ��� �� � , 7�17 1° � 11332 �,��I STER� ���'� SSI�NAL � EXPIRES 11%30/04 ' Baima & Holmberg, Inc. Job No. 2077-001 Prepared For Sound Investments RE�EjVED , �AN 2 9 �:i:.'�4 BU��NG vivis�oN 100 FRONT STREET SOUTH • ISSAQUAH • WASHINGTON • 98027-3817 • (425) 392-0250 • (425) 391-3055 Project Overview This project involves the construction of 16 townhouses on a 0.80-acre parcel located on the west side of Sunset Blvd NE, adjacent to the east side of the I- 405 right-of-way. The parcel is vacant, and slopes west, down towards I-405 at about 5% to 20%. Level 1 Downstream Drainage Analvsis Runofffrom the site flows west towards I-405 through a shallo«� ravine to a catch basin located adjacent to the I-405 roadway. There are no apparent erosion problems in this ravine. From the catch basin, flows continue nort}� �I approximately ?50' through an 18" storm pipe. Flows continue west, crossing about 330' under I-405 through a 36" pipe, discharging to a wetland. The wetland drains south about 850' where it discharges into a 24" pipe. This pipe conveys flows west along North S�' Street to beyond '/4 mile downstream of tr� site. There are no obvious erosion or capacity problems along this downstream flow path. Proposed Draina�e Control A combined detention and water quality dead storage tank sized per the 1990 King County Drainage Control Manual (as adopted by Renton)will be used control stormwater runoff from the site. 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' :G _ 3. 2� t_e � o H � ��, __ _. _ z : __ �; � _ ° __ __ 3 , _ _ __ __ _ _ ___ ._ : : __ _ � .z , : : __ _ ___ ___ . _ _ ___ __ _ lN��2 u�t1�TN� �-=_ __ �' ��� __ ___ __ _;. #�.4<Z�D.t� ____ __._ :_. . ._ _ _ _ _. � ; : .3 : _ ,2$ �E- �.0�3 _Z . . , _ _ . s : _ _ ; __ � _ ... — ' ._. - __ _ _ :._ , : -- , �. �*q� -� /_�•,r . „ _ : .___ ; _ _;. _ _ -_... ;._. _ _ _ _ _ ,. ,_ _. ;:_. :_ ,_ : -"__ ; ' PROOUCf204�1(Suple$AeOs)ZU5�7(PaddeE� -� SBUH Design of 3. 75' Deep Detention Vault Matching 2/2 and 10/10 I Storm Requirements of 1990 KCSWDM PERFORMANCE: INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE ' DESIGN HYD: .53 .28 .28 3.75 959 � TEST HYD 1: .34 .14 .14 2.18 550 j TEST HYD 2: .75 .75 .75 3.87 990 ' STF2UCTURE DATA: R/D-VAULT R.ISER-HEAD VAULT-BOTTOM-AREA STOR-DEPTH STORAGE-VOLUME �C �11'j��/� 3.75 FT 256.2 SQ-FT 3.75 FT 959 CU-FT � .� V��� �1 r"�S, DOUBLE ORIFICE RESTRICTOR: DIA(I23CHES) HT�FEET) Q-MAX;CFS) BOTTOM ORIFICE: 1.85 .00 . 180 TOP ORIFICE: 3.61 3.67 . 100 ROUTING DATA: C� �v���� � i �� ��� STAGE(FT) DISCHARGE(CFS) STORAGE(CU-FT) PERM-AREA(SQ-FT) w r=t � .00 .00 .0 .0 ��� l�� .38 .06 96.1 -0 � S,S,f(,���� .75 .08 192.1 .0 1. 13 .10 288.2 .0 1.50 .11 384.3 .0 1.88 .13 480.4 .0 2.25 .14 576.4 .0 2. 63 .15 672.5 .0 3. 00 .16 768.6 .0 3.38 .17 864.6 .0 3.67 .18 940.2 .0 3.75 .28 960.7 .0 3.85 .64 986.3 .0 3.95 1.24 1011.9 .0 4.05 2.01 1037.6 .0 �i.15 2.83 1063.2 .0 4.25 3.14 1088.8 .0 AVERAGE VERTICAL PERMEABILITY: .0 MINUTES/INCH � u�"�,t �� � � "�� ��� �'' L' � , / � ���� � � Route 2-yr, 10-yr & 100-yr Developed Conditions Hydrographs thru 50' long 7' diameter Tank (top 3.75' live storage) ROUTING DATA: - ! STAGE(FT) DISCHFcRGE(CFS) STORAGE( -FT) PERM-AREA SQ-FT) 3.25 00 � .0 .0 3.63 �06 f 132.9 .0 4.00 : .08 �� 261.8 .0 4.3 8 ti� 10 3 9 2.2 -0 �."� 3 �5 ! 4.7 5 {(� � .11 / ` 515.4 .0 l � 5.13 ,�� J .13 636.6 .0 � � -t��f�.y�_ 5.50 �. � 14 747.2 .0 �� � �� 5.88 j .15 850.8 .0 �� �/ 6.25 !` .16 938.7 .0 j 6.63 17 1010.5 .0 6.92 �,.18 �.�''�' �'� 1045.6 ' .0 L�N� 7.00 �� .28 -�`�.�"� 1049.5 .0 7.10 �y�,,.��� �-�6 4 ; �r�1 ti 10 4 9.5 .0 7.20 ,� x,�ti� " 1.24 ,"�K ��, 1049.5 .0 7.30 �2.01 , ,k 1049.5 .0 7.40 � � � 2.83 ' 1049.5 .0 7.50 ��' ��"' �3.14 1049.5 .0 7.60 �,3.41 049. .0 AVERAGE PERM-RATE: .0 MINUTES/INC Route 10-yr Developed Hydrograph INFLOW/OUTFLOW ANALYSIS: PEAK-INFLOW{CFS} PEAK-OUTFLOW(CFS) OUTFLOW-VOL(CU-FT) .53 .27 6833 INITIAL-STAGE(FT) TIME-OF-PEA (HRS) PEAK-STAGE-ELEV(FT) .00 8.00 6.99 t PEAK STORAGE: 1040 CU-FT Q(O `l�'�'/W�� _ O '�� G`S � Route 2-yr Developed Hydrograph INFLOW/OUTFLOW ANALYSIS: PEAK-INFLOW(CFS) PEAK-OUTFLOW(CFS) OUTFLOW-VOL(CU-FT) .34 .13 4536 INITIAL-STAGE(FT) TIME-OF-PE (HRS) PEAK-STAGE-ELEV(FT) .00 8.17 5.09 �i � O ' �� G�S PEAK STORAGE: 620 CU-FT •LAw�'V,�� !� - O`' Route 100-yr Developed Hydrograph = INFLOW/OUTFLOW ANALYSIS: PEAK-INFLOW(CFS) PEAK-OUTFLOW(CFS) OUTFLOW-VOL{CD-FT) .75 .75 9617 INITIAL-STAGE(FT) TIME-OF-PEAK(HRS) PEAK-STAGE-ELE���rFT; .00 7.83 7.13 PEAK STORAGE: 1040 CU-FT � D.I 3+ l�n `�L Dv��Cor� t��lk�� � (�v�%� �Z`� �V�l2�CD� ��5� � King County `HYD' Input File for designing 3.75' Deep Detention Vault using the 1990 KCSWDM Standard 2-yr, 10-yr Detention Criteria (prior to adding 40� factor of safety) I -1 10 3 3.75 lOd.hyd � .28 2 ' 2d.hyd I .14 I 100d.hyd � .75 2 3.75 12 N I C .18 3.67 d f vault375.rt I, s 11 King County `HYD' Input File for Routing Developed-Conditions 2 , ' 10 and 100-year Hydrographs Through Top 3.75' of 7� Diameter Detention Tank -1 4 tank375.rt Y lOd.hyd lOd.rt ', c 2d.hyd 2d.rt c 100d.hyd 100d.rt s 11 CUSTOM STAGEIRELEASEISTORAGE TABLE for Top 3.75' of 7' Diameter Tank PIPE DIA.(ft)= 7.00 LENGTH OF PIPE(ft)= 50.00 ORIFICENVEIR PIPE PIFt STAGE(ft) RELEASE(tt"3/sec) AREA(ft"2) VOLUME{ft^' 0.00 0.00 0.0 0.38 0.81 40.6 0.75 2.22 110 1.13 4.03 201 1.50 6.05 302". 1.88 8.32 496-" 225 10.68 534 ^ 2.63 1322 66Q.8 Before 40% Factor of Safety 3.00 15.75 787.7 W/Q Dead Storage Volume Top of Dead Storaqe 3.25 17.49 874.7 = 875 cu-ft After 40%Factor of Safety W/Q Dead Storage Volume Bottom of Detention Storaqe = 1225 Cu-ft 3.25 0.00 0.00 0.0 3.63 0.04 2.66 132.9 4.00 0.06 524 261.8 4.38 0.08 7.84 392.2 4.75 0.09 10.31 515.4 5.13 0.10 12.73 636.6 5.50 0.11 14.94 747.2 5.88 0.12 17.02 850_8 6.25 0.13 18.77 938.7 6.63 0.13 2021 1010.5 Before 40%Factor of Safety 6.92 0.14 20.91 1045.6 Detention Volume i Overflow 7.00 0.22 20.99 1049.5 = 1049.5 cu-ft I 7.10 0.57 1049.5 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN FIGURE III-1.1 Volume Correction Factor to be Applied to Streambank Erosion Control BMPs Based on Site Impervious Cover so as �o __ �.._.�_ _� Q �Q 35 � LL � Z 30 0 �i w � a 0 V � 15 10 0 20 40 60 �0 100 SITE IbPERVIOVS COVER [%� �.� III-1-3 FEBRUARY, 1992 Existing Conditions SBUH Peaks ——------------------------------------------------------—------ ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 2-YEAR 24-HOUR STORM **** 2.00" TOTAL PRECIP. ********* ---------------------------------------------------------------------- DATA PRINT-OUT: AREA!ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN . 8 .7 85.0 .1 98.0 16.1 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT} .14 7.83 2585 ---------------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 10-YEAR 24-HOUR STORM **** 2.90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .7 85.0 .l 98.0 16.1 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-ET) .28 7.83 4694 Developed Conditions SBUH Peaks ----------------------------------—----------------—-------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 6-MONTH 24-HOUR STORM **** .67" TOTAL PRECIP. ********* ---------------------------------------------------------------------- DATA PRINT-OUT: AREA(ACRES} PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN . 8 .2 86.0 .6 98. 0 S.0 PEA.K-Q(CFS) T-PEAK(HRS) VOL(CU-FT) , Og 7.67 1078 ---------------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 2-YEAR 24-HOUR STORM **** 2.00" TOTAL PRECIP. ********* ---------------------------------------------------------------------- DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .2 86.0 . 6 98.0 5.0 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) .34 7.67 4480 ---------------------------------------------------------------------- ******************** S.C.S. TYPE-lA DISTRIBUTION ******************** ********* 10-YEAR 24-HOUR STORM **** 2.90" TOTAL PRECIP. ********* ---------------------------------------------------------------------- DATA PRINT-OUT: I ARE.AfACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN .8 .2 86.0 .6 98.0 5.0 � PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) �I .53 7. E7 6957