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03138 - 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. A level spreader located at the downhill edge of the property will dispense flows onto the adjacent property in an unconcentrated manner, thus mimicking the existing conditions and preventing flow concentrations that might otherwise cause erosion. 1 `k- --- — — --— — --- __ _. -- —�-- -- --� _.._ �__ _. �.. _. — -- � __ ...._ __ ..... ._ --- ..._. .._ .�_.._...... _.. _._____— _ ._.._ ——----—--—�— —- � � � �� ^ `� � _ 0 3 o A \ � � � ,� �` I ���� � 2 �-"` � � � � �� , !2 J � � ��.,:�� _ ; �, ti % � I" , �—' � � 0 � � � i, fx���:�� l � Y � � � ,: , �„x�. � � 11 v �� � � � � W 6 � � I `� � i f� ;� r�/i � � , 4� �/j, Ex e��c � °4�7 '^ I,� , '' -i " � � _X �Li)G �i i t' L l•'K GJN�.�-�F �''• �� � pt �'� � �`n � � � Yww�� �s s-,a-z-�=• � f� „,� , � , , � i � �a� , � , . -•�_. '� ��\ 1r ��' i �� ` t r r 9 � 4 ����'i� 1... � .� �i�::��tu��% �. 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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