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HomeMy WebLinkAboutDOC-1996-Storm Drainage Calculation - K I ENGINEERING.. Planning, Civil & Structural Engineering J.N. 0109-01 February 2, 1996 STORM DRAINAGE CALCULATION FOR SECURITY INVESTORS, INC: ANACORTES SENIOR HOUSING Located in lots 1-10, block 55 and lots 9-18, block 56, 'O'Ave., Anacortes Skagit County, Washington i 1y KALE oFWAsy�^`9�. r h:' o 1 ` 10 � 27104 IF Content: tixPln¢s9/19//6��17 —� Sheet Runoff Estimate: Existing Conditions 2 - 4 Developed Conditions 5 - 7 Detention Storage Sizing 8, 9 Maps: Existing Conditions 10 Developed Conditions- 11 Detention Storage Selection 12 4020 PETERS. L,ANE., ANACORTES, WA 98221 9 TEL.: (360) :293-4.82.5, MOBILE: (360). 929-2842 J.N. 0109-01 Page 2 of 12 Runoff Estimate A) EXISTING CONDITIONS Areas: Acres CN Total 2.05 Impervious dirt road 0 07 87 Pervious brush and lawn 1.37 83 woods 0.19 81 lawn 0.65 86 Pervious total 1.98 83.8 i Time of concentration: Sheet Flow Ns=0.25(brush & lawn), So=0.05 L=3001f, P2=1.45"/24hr Tc=0.42(Ns L)A0.8/[(P2)A1/2 SOA0.4] Tc=36.2 min. To = 36.2 min. Rain intensity Pz = 1.45"/24hr P25 = 2.55"/24hr Pla = 2.20"/24hr P100 = 3.25"/24hr Runoff: Q2 = 0.07 cfs Q25 = 0.34 cfs Qia = 0.24 cfs Q100 = 0.54 cfs J.N. 0109-01 Page 3 of 12 2YR/24HR ------------------------------------------------------------------------------------------------------------------- S.C.S. TYPE-1A DISTRIBUTION 2-YEAR 24-HOUR STORM **** 1.45"TOTAL PRECIP. ********* ------------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 1.98,83.8,0.07,87,36.2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 2.0 83.8 0.1 87.0 36.2 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 0.07 8.00 2826 ENTER [d:][Path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: e2yr 10YR(24HR ----------------------------------------------------------------------------------------------------------------------- �� �*�*"' S.C.S. TYPE-1A DISTRIBUTION **� 10-YEAR 24-HOUR STORM **** 2.20" TOTAL PRECIP. ********* --------- ------ ------ ------------- ---- ----------- ------ ---------- ------------ -------- ----- - — — ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 1.98,83.8,0.07,87,36.2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 2.0 83.8 .1 67.0 36.2 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-F f) 0.24 8.00 6535 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: e10yr I I J.N. 0109-01 Page 4 of 12 26YRl24HR ----—---------------—----------------------------------------------------------------------------------------------- S.C.S. TYPE-1A DISTRIBUTION ***� ********* 25-YEAR 24-HOUR STORM **** 2.55' TOTAL PRECIP. *"******* ---------------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 1.98,83.8,0.07,87,36.2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 2.0 83.8 .1 87.0 36.2 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 0.34 8.00 8502 ENTER [d:][path]filename[.e,d) FOR STORAGE OF COMPUTED HYDROGRAPH: e25yr 100YR/24HR ----------------------------------------------------------------------------------------------------------------------- S.C.S. TYPE-1A DISTRIBUTION ******************** ********* 100-YEAR 24-HOUR STORM **** 3.25"TOTAL PRECIP. ********" ----------------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 1.98,83.8,0.07,87,36.2 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A, CN A, GN 2.0 2.0 83.8 0.1 87.0 36.2 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 0.54 7.83 12687 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: el 00yr J.N. 0109-01 Page 5 of 12 A) DEVELOPED CONDITIONS Areas: Acres CN Total 2.05 Impervious paving 0.64 98 bldgs. 0.78 98 sidewalk, patio 0.08 98 Impervioue total 1.50 98 Pervious landscaping (grass) 0.55 86 Time of concentration: Sheet Flow Ns=0.15, So=0.04 L=551f, P2=1.45"/24hr Tc=0.42(Ns L)A0.8/[(P2)AI12 SOA0.41 Tc=6.77 min. Pipe flow k=42, So=0.027, L=3001f T=L/k[(SO)A1/2]/60 = 0.72 min To = 7.49 min. Rain intensity P2 = 1.45"/24hr P25 = 2.55/24hr P10 = 2.20"/24hr P100 = 3.25"/24hr Runoff: 02 = 0.54 cfs Q25 = 1.08 cfs Q10 = 0.91 cfs Q100 = 1.43 cfs J.N. 0109-01 Page 6 of 12 2YR/24HR ----------------------------------------------------------------------------------------------------------------------- ********`******* ***S.C.S. TYPE-1A DISTRIBUTION 2-YEAR 24-HOUR STORM **** 1.45"TOTAL PRECIP. ********* -------------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO, 1 0.55,86,1.50,98,7.49 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 0.6 86.0 1.5 98.0 7.5 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 0.54 7.83 7618 ENTER [d:][path]fiIoname[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: d2yr 10YR/24HR ------------------------------------------------------------------------------------------------------------------- ***"********'****** S.C.S. TYPE-1A DISTRIBUTION —****************** 10-YEAR 24-HOUR STORM **** 2.20"TOTAL PRECIP. *** ***** --------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 0.55,86,1.50,98,7.49 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 .6 86.0 1.5 98.0 7.5 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 0.91 7.83 12742 ENTER [d][path]filename[ext] FOR STORAGE OF COMPUTED HYDROGRAPH: d10yr J.N. 0109-01 25YR/24HR Page 7 of 12 ------------------------------------------------------------------------------------------------------------------------ "`�S.C.S. TYPE-1A DISTRIBUTION * *"****"*"********* ********* 25-YEAR 24-HOUR STORM *"** 2.55" TOTAL PRECIP. ********* -- --------------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 0.55,86,1.50,98,7.49 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 .6 86.0 1.5 98.0 7.5 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 1.08 7.83 15197 ENTER [d:][pathjnIename[.exq FOR STORAGE OF COMPUTED HYDROGRAPH: d25yr 100YR/24HR --------------------------------------------------------------------------------------------------------------------- * *�S.C.S. TYPE-1A DISTRIBUTION 100-YEAR 24-HOUR STORM **** 3.25" TOTAL PRECIP. ---------------------------------------------------------------------------------------------------------------------- ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 0.55,86,1.50,98,7.49 DATA PRINT-OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) A CN A CN 2.0 0.6 86.0 1.5 98.0 7.5 PEAK-Q(CFS) T-PEAK(HRS) VOL(CU-FT) 1.43 7.83 20177 ENTER [d:][path]filename[.ext] FOR STORAGE OF COMPUTED HYDROGRAPH: d100yr J.N. 0109-01 Page 8 of 12 Storage Sizing SUMMARY OF INPUT ITEMS 1) TYPE OF F(CILITY: TANK 2) TANK DIAMETER(ft), STORAGE DEPTH(ft): 4.25, 4.25 3) VERTICAL PERMEASILITY(min/in): .00 4) PRIMARY DESIGN HYDROGRAPH FILENAME: d2Syr 5) PRIMARY RELEASE RATE(cfs): .34 6) NUMBER OF TEST HYDROGRAPHS: 2 TEST HYD I FILENAME: d2yr TARGET RELEASE(cfs): .07 TEST HYD 2 FILENAME: d10yr TARGET RELEASE(cfs): .24 7) NUMBER-OF-ORIFICES, RISER-HEAD(ft), RISER-DIAM(in): 2, 4,25, 12 8) ITERATION DISPLAY: NO ENTER ITEM NUMBER TO BE REVISED (ENTER ZERO IF NO REVISIONS ARE REQUIRED): 0 INITIAL STORAGE VALUE FOR ITERATION PURPOSES: 5682 CU-FT BOTTOM ORIFICE: ENTER Q-MAX(Cfs) 0.07 DIA.= 1.12 INCHES TOP ORIFICE: ENTER HEIGHT(ft) 3.05 DIA.= 3.01 INCHES PERFORMANCE: INFLOW TARGET-OUTFLOW ACTUAL-OUTFLOW PK-STAGE STORAGE DESIGN HYD: 1.08 .34 .34 4.24 4742 TEST HYD 1: .54 .07 .07 3.09 3680 TEST HYD 2: .91 .24 .23 S.50 4170 SPECIFY: 0 - DOCUMENT, R - REVISE, A - ADJUST ORIF, E - ENLARGE, S - STOP J.N. 0109-01 Page 9 of 12 STRUCTURE DATA: R/D TANK (FLAT GRADE) STRUCTURE DATA: R/D TANK (FLAT GRADE) RISER-HEAD TANK-DIAM STOR-DEPTH TAW-LENGTH STORAGE-VOLUME 4.25 FT 4.25 FT 4.25 FT 334.6 FT 4742 CU-FT DOUBLE ORIFICE RESTRICTOR: DIA(INCHES) HT(FEET) Q-MAX(CFS) BOTTOM ORIFICE: 1.12 .00 .070 TOP ORIFICE: 3.01 3.05 .270 ROUTING DATA: STAGE(FT) DISCHARGE(CFS) STORACE(CU-FT) PERM-AREA(SQ-FT) .00 .00 .0 .43 .02 247.0 .ss .03 675.8 .0 1.28 .04 1197.6 .0 1.70 .04 1772.9 .0 2.13 .05 2373.2 .0 2.SS .05 2973.4 .0 2.98 .06 3548.8 .0 3.05 .06 3645.7 .0 3.40 .21 4070.5 .0 3.83 .28 4499.3 .0 4.25 .34 4746.3 .0 4.35 .66 4746.3 .0 4.45 1.23 4746.3 .0 4.55 1.97 4746.3 .0 4.65 2.78 4746.3 .0 4.75 3.07 4746.3 .0 AVERAGE VERTICAL PERMEABILITY: .0 MINUTES/INCH SPECIFY* F - FILE, N - NEWJOB, F, - PRINT IF/OF, R - REVISE, 5 - STOP F TANKSlin.FIN • • � �.,-X I ST 1.11.E GO►.l ID t'� .ONS ��,- �� `� � J '' I + i �: �i'i r' 3• '� i I I � � I + 1 lu l`1 ! f� i "i 11 1. �{ ('-a:.:�....`z.-_.'�''1 I �}� �'I I "✓�Yr_+G'4� �'v�� �� � ! .� I F -Tyy3iii �T } r i r S • I I r �r f I f I• ,t 11 f + .•�� _ �i.` 1� 4 ath A\ 1,7 IT ------------- _ J 1. -Jt_" _T_-T-__rt__ 1__+__ _ram i___� _�_ ••� 4 -- I . p