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HomeMy WebLinkAboutStorm Drainage Calculations Summer 2014 Connections Credit Union Ten Mile Road Branch - Meridian, Idaho Storm Drainage Calculations < S\ON ,eN, • U 3 ' 7/31/14 Pos S K ER' Summer 2014 erickson civil r _i Connections Credit Union Ten Mile Road Branch Meridian, Idaho Dsesign Criteria: Storage Design Storm: 100-yr Conveyance Design Storm: 100-yr(conveyance system; pipes, etc.) Pre Development Discharge: None Water Quality Design Storm: 2-yr Storm Peak flow rates were calculated for each sub-basin using the rational method (equation 1- 1). Storm rainfall intensities were derived from the 2-year, 10-year, 25-year and 100-year intensity duration frequency curves for Zone A using calculated times of concentration. The time of concentration was calculated for each sub-basin based on the runoff coefficient "C" as defined in the rational method peak flow rate equation, and the individual sub-basin slope and length (see equation 1-2). Q=CiA (equation 1-1) where; Q= Peak Flow Rate (cfs) C= Runoff Coefficient(dimensionless) i= Rainfall Intensity(inches/hour) A = Drainage Area (acres) 1.8x(1.1—C}N/D = (equation 1-2) where; t,= Time of Concentration (minutes) C= Runoff Coefficient (dimensionless) D = Distance from Remotest Contributing Point(feet) S= Slope Along D The rational method for peak flow calculation assumes: 1)the rainfall occurs uniformly over the drainage area; 2) the peak rate of runoff can be reflected by the rainfall intensity averaged over a time period equal to the time of concentration of the drainage area; and 3) the frequency of runoff is the same as the frequency of rainfall used in the equation. t ? Basin-1 Pretreatment: Bio Filtration&Filter Sand Storage: Infiltration Swale #1 C-Value Roof 913 Sq. Ft. 0.95 " Concrete&Asphalt 5861 Sq. Ft. 0.95<---- Landscape .95 -Landscape 4032 Sq. Ft. 0.15 .4"-- Not Not Used Sq. Ft. 0 Total Area 10,806 Sq. Ft. Run Off Coefficient 0.65 Basin Length: 100 feet Delta Z: 2 ft Average Basin Slope: 2.00 % Time of Concentration: 10.00 min Intensity(2-year): 1.0 in/hr Qp(2-year): 0.16 cfs Intensity(25-year): 2.5 in/hr Qp(25-year): 0.40 cfs Intensity(50-year): 2.8 in/hr Qp(50-year): 0.45 cfs Intensity(100-year): 3.2 in/hr Qp (100-yr): 0.51 cfs (-09?J (c n c )1,_ c,t ) k. (.o( c y,, s--K)) -t ( . IC y, -(03 -,) ) I\ --a_ -(7- .E-.) e-) c-rC,I . 3 c k I 11 � I ado , d �73 "a-- -.1 t 1' 7 � Basin-2 Pretreatment: Bio Filtration&Filter Sand Storage: Infiltration Swale #2 C-Value Roof 0 Sq. Ft. 0.95 Concrete&Asphalt 846 Sq. Ft. 0.95 Landscape 4574 Sq. Ft. 0.15 Not Used Sq. Ft. 0 Total Area 5,420 Sq. Ft. Run Off Coefficient 0.27 Basin Length: 100 feet Delta Z: 0.85 ft Average Basin Slope: 0.85 % Time of Concentration: 15.68 min Intensity(2-year): 0.8 in/hr Qp(2-year): 0.03 cfs Intensity(25-year): 1.9 in/hr Qp(25-year): 0.06 cfs Intensity(50-year): 2.1 in/hr Qp(50-year): 0.07 cfs Intensity(100-year): 2.4 in/hr Qp (100-yr): 0.08 cfs Basin-3 Pretreatment: Bio Filtration &Filter Sand Storage: Infiltration Swale #3 C-Value Roof 0 Sq. Ft. 0.95 Concrete&Asphalt 2574 Sq. Ft. 0.95 Landscape 2734 Sq. Ft. 0.15 Not Used Sq. Ft. 0 Total Area 5,308 Sq. Ft. Run Off Coefficient 0.54 Basin Length: 120 feet Delta Z: 0.72 ft Average Basin Slope: 0.60 % Time of Concentration: 13.14 min Intensity(2-year): 0.9 in/hr Qp(2-year): 0.06 cfs Intensity(25-year): 2.1 in/hr Qp(25-year): 0.14 cfs Intensity(50-year): 2.3 in/hr Qp(50-year): 0.15 cfs Intensity(100-year): 2.7 in/hr Qp (100-yr): 0.18 cfs Basin-4 Pretreatment: Bio Filtration&Filter Sand Storage: Infiltration Swale #4 C-Value Roof 3042 Sq. Ft. 0.95 Concrete&Asphalt 7564 Sq. Ft. 0.95 Landscape 7645 Sq. Ft. 0.15 Not Used Sq. Ft. 0 Total Area 18,251 Sq. Ft. Run Off Coefficient 0.61 Basin Length: 255 feet Delta Z: 1 ft Average Basin Slope: 0.39 % Time of Concentration: 19.05 min Intensity(WQ Storm) 0.34 in/hr Qp(wq): 0.09 cfs Intensity(2-year): 0.7 in/hr Qp(2-year): 0.19 cfs Intensity(25-year): 1.7 in/hr Qp(25-year): 0.43 cfs Intensity(50-year): 1.9 in/hr Qp(50-year): 0.48 cfs Intensity(100-year): 2.2 in/hr Qp (100-yr): 0.56 cfs Basin-5 Pretreatment: 1000 gallon sand and grease trap Storage: Infiltration Gallery #1 C-Value Roof 0 Sq. Ft. 0.95 Concrete&Asphalt 0 Sq. Ft. 0.95 Landscape 0 Sq. Ft. 0.15 Not Used Sq. Ft. 0 Total Area 0 Sq. Ft. Run Off Coefficient #DIV/0! Basin Length: 133 feet Delta Z: 1.65 ft Average Basin Slope: 1.24 % Time of Concentration: #DIV/0! min Intensity(WQ Event) 0.34 in/hr Qp(WQ): ##### cfs Intensity(2-year): #DIV/0! in/hr Qp(2-year): ##### cfs Intensity(25-year): #DIV/0! in/hr Qp(25-year): ##### cfs Intensity(50-year): #DIV/0! in/hr Qp(50-year): ##### cfs Intensity(100-year): #DIV/0! in/hr Qp (100-yr): ##### cfs I i Sand & Grease Trap Throat Velocity The target throat velocity design value is 0.5 ft/sec through the baffles of the S&G trap for the 2-year water quality design storm. 1000 GAL AREA= 8 SF Baffle/Box Width = 48 inches Throat Width = 24 inches 1500 GAL AREA= 10.42 SF DB-350 Baffle/Box Width = 62.5 inches 41 inches Baffle Spacing = 24 inches 5 inches 2-Year WQ EVENT(0.34") 100-Year Throat Qp Throat Vel Qp Throat Vel Throat Vel SIZE Structure Area SF CFS ft/sec CFS ft/sec Qp ft/sec 1000 SG-1 8.00 #DIV/0! #DIV/0! #DIV/0! ##### #DIV/0! 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I. ,Ii;$IF o 1,;;;;1, - PI 14 [ 7- ,._:.g.','?2';1 11 g• ;.',,, , 0 ,Tri;•,1M I I I -7-- ' -!'f ‘ TIZ', 0/ ,'.”; -3£/.;.'ir !,/41/i °Z .•''1'0 . ii Beti L.:Ai Min i T jg 11:!:-i Ifin Infiltration Swale No. 1 CONNECTIONS CREDIT UNION-TEN MILE&PINE Storm Drain Infiltration Trench Sizing 100-Year Recurrance Interval Using ITD Zone A Chart Interpolated For A 100 Year Storm C-Value Roof 913 Sq. Ft. 0.95 Concrete&Asphalt 5861 Sq. Ft. 0.95 Landscape 4032 Sq. Ft. 0.15 NOT USED 0 Sq. Ft. 0 Total Area 10806 Sq. Ft. Run Off Coefficient 0.65 Bottom Area 242 SF Percolation Rate 4 In./Hr. Include Percolation Credit for Desig Y (Y/N) Predevelopment Discharge Rate 0 CFS(for 1-hour storm) Storm Storm Run Off Run Off Percolation Storage Duration Intensity Rate Volume Volume Required (in/hr) (cfs) (ft3) (ft3) (ft3) 5 Min. 4.38 0.70789 212 7 206 30 Min. 1.73 0.27960 503 40 463 60 Min. 1.06 0.17132 617 81 536 120 Min. 0.61 0.09859 710 161 548 360 Min. 0.26 0.04202 908 484 424 720 Min. 0.150 0.02424 1047 968 79 1440 Min. 0.081 0.01309 1131 0 1,131 Stormwater Volume 536 Cu. Ft. Required Seepage Bed Volume 536 Cu. Ft. Swale Storage Volume 670 Cu. Ft. Pre-Development Discharge Volume 0 Cu. Ft. Total Storage Available 670 Cu. Ft. Perc Volume Per Hour 80.7 cuft/hr Time to infiltrate 90%of the design storm= 6.6 hours * Rational Formula Q=CiA ** Percolation Area=Pond Bottom INFILTRATION SWALE-BASIN 1.xls 7/31/2014 . Infiltration Swale No. 2 CONNECTIONS CREDIT UNION-TEN MILE&PINE Storm Drain Infiltration Trench Sizing 100-Year Recurrance Interval Using ITD Zone A Chart Interpolated For A 100 Year Storm C-Value Roof 0 Sq. Ft. 0.95 Concrete&Asphalt 846 Sq. Ft. 0.95 Landscape 4574 Sq. Ft. 0.15 NOT USED 0 Sq. Ft. 0 Total Area 5420 Sq. Ft. Run Off Coefficient 0.27 Bottom Area 30 SF Percolation Rate 4 In./Hr. Include Percolation Credit for Desig Y (Y/N) Predevelopment Discharge Rate 0 CFS(for 1-hour storm) Storm Storm Run Off Run Off Percolation Storage Duration Intensity Rate Volume Volume Required (in/hr) (cfs) (ft3) (ft3) (ft3) 5 Min. 4.38 0.14980 45 1 44 30 Min. 1.73 0.05917 107 5 102 60 Min. 1.06 0.03625 131 10 121 120 Min. 0.61 0.02086 150 20 130 360 Min. 0.26 0.00889 192 60 132 720 Min. 0.150 0.00513 222 120 102 1440 Min. 0.081 0.00277 239 0 239 Stormwater Volume /21 Cu. Ft. Required Seepage Bed Volume 121 Cu. Ft. Swale Storage Volume ( 200 Cu. Ft. Pre-Development Discharge Volume 0 Cu. Ft. Total Storage Available 200 Cu. Ft. Perc Volume Per Hour 10.0 cuft/hr Time to infiltrate 90%of the design storm= _ 112.1 hours * Rational Formula Q=CiA Y ** Percolation Area=Pond Bottom INFILTRATION SWALE-BASIN 2.xls 7/31/2014 Infiltration Swale No. 3 CONNECTIONS CREDIT UNION-TEN MILE&PINE Storm Drain Infiltration Trench Sizing 100-Year Recurrance Interval Using ITD Zone A Chart Interpolated For A 100 Year Storm C-Value Roof 0 Sq. Ft. 0.95 Concrete&Asphalt 2574 Sq. Ft. 0.95 Landscape 2734 Sq. Ft. 0.15 NOT USED 0 Sq. Ft. 0 Total Area 5308 Sq. Ft. Run Off Coefficient 0.54 Bottom Area 185 SF Percolation Rate 4 In./Hr. Include Percolation Credit for Desig Y (Y/N) Predevelopment Discharge Rate 0 CFS(for 1-hour storm) * ** Storm Storm Run Off Run Off Percolation Storage Duration Intensity Rate Volume Volume Required (in/hr) (cfs) (ft3) (ft3) (ft3) 5 Min. 4.38 0.28711 86 5 81 30 Min. 1.73 0.11340 204 31 173 60 Min. 1.06 0.06948 250 62 188 120 Min. 0.61 0.03999 288 123 165 360 Min. 0.26 0.01704 368 370 (2) 720 Min. 0.150 0.00983 425 740 (315) 1440 Min. 0.081 0.00531 459 0 459 X Stormwater Volume 188 Cu. Ft. Required Seepage Bed Volume 188 Cu. Ft. Swale Storage Volume X300 Cu. Ft. Pre-Development Discharge Volume 0 Cu. Ft. Total Storage Available 300 Cu. Ft. Perc Volume Per Hour 61.7 cuft/hr Time to infiltrate 90%of the design storm= 3.1 hours * Rational Formula Q=CiA ** Percolation Area= Pond Bottom INFILTRATION SWALE-BASIN 3.xls 7/31/2014 Infiltration Swale No. 4 CONNECTIONS CREDIT UNION-TEN MILE&PINE Storm Drain Infiltration Trench Sizing 100-Year Recurrance Interval Using ITD Zone A Chart Interpolated For A 100 Year Storm C-Value Roof 3042 Sq. Ft. 0.95 Concrete&Asphalt 7564 Sq. Ft. 0.95 Landscape 7645 Sq. Ft. 0.15 NOT USED 0 Sq. Ft. 0 Total Area 18251 Sq. Ft. Run Off Coefficient 0.61 Bottom Area 299 SF Percolation Rate 4 In./Hr. Include Percolation Credit for Desig Y (Y/N) Predevelopment Discharge Rate 0 CFS(for 1-hour storm) Storm Storm Run Off Run Off Percolation Storage Duration Intensity Rate Volume Volume Required (in/hr) (cfs) (ft3) (ft3) (ft3) 5 Min. 4.38 1.12843 339 8 330 30 Min. 1.73 0.44570 802 50 752 60 Min. 1.06 0.27309 983 100 883 120 Min. 0.61 0.15716 1132 199 932 360 Min. 0.26 0.06698 1447 598 849 720 Min. 0.150 0.03864 1669 1,196 473 1440 Min. 0.081 0.02087 1803 0 1,803 Stormwater Volume 883 Cu. Ft. Required Seepage Bed Volume 883 Cu.Ft. Swale Storage Volume 1,300 Cu. Ft. Pre-Development Discharge Volume 0 Cu. Ft. Total Storage Available 1,300 Cu. Ft. Perc Volume Per Hour 99.7 cuft/hr Time to infiltrate 90%of the design storm= 8.9 hours * Rational Formula Q=CiA ** Percolation Area=Pond Bottom INFILTRATION SWALE-BASIN 4.xls 7/31/2014 (Basin#5) Infiltration Gallery No. 1 CONNECTIONS CREDIT UNION TEN MILE ROAD BRANCH Storm Drain Infiltration Trench Sizing 100-Year Recurrance Interval Using ITD Zone A Chart Interpolated For A 100 Year Storm C-Value Roof 2115 Sq.Ft. 0.95 Concrete&Asphalt 13007 Sq.Ft. 0.95 Landscape 1169 Sq.Ft. 0.2 NOT USED 0 Sq.Ft. 0 Total Area 16291 Sq.Ft. Run Off Coefficient 0.90 Bed Length*** 62 Ft. Bed Width 14 Ft. Bed Depth 3 Ft. Percolation Rate 8 In./Hr. Include Percolation Credit for Desig y (Y/N) Predevelopment Discharge Rate 0 CFS(for 1-hour storm) * ** Storm Storm Run Off Run Off Percolation Storage Duration Intensity Rate Volume Volume Required (in/hr) (cfs) (ft3) (ft) (ft3) 5 Min. 4.38 1.46801 440 17 424 30 Min. 1.73 0.57983 1,044 101 942 1 Hr. 1.06 0.35527 1,279 203 1,076 2 Hr. 0.61 0.20445 1,472 405 1,067 6 Hr. 0.26 0.08714 1,882 1,216 666 12 Hr. 0.150 0.05027 2,172 2,432 (260) 24 Hr. 0.081 0.02715 2,346 4,864 (2,518) Drain Bed Voids 40 °A) 18"Pipe Volume 1.77 Cu.Ft./Ft. Bed Storage Volume 17.86 Cu.Ft./Ft. Stormwater Volume 1,076 Cu.Ft. Required Seepage Bed Volume 1,076 Cu.Ft. Increase 0% 0 Cu.Ft. Total 1,076 Seepage Bed Storage Volume 1,107 Cu.Ft. Swale Storage Volume 0 Cu.Ft. Pre-Development Discharge Volume 0 Cu.Ft. Total Storage Available 1,107 Cu.Ft. Perc Volume Per Hour 202.7 cuft/hr Time to infiltrate 90%of the design storm= 5.3 hours * Rational Formula Q=CiA ** Percolation Area.- 3 of trench wall height along bed perimeter(excluding freeboard) INFILTRATION GALLERY-1.xls L4 OL/6 ,-,4 -)R � k)\� C)Q 7/31/2014 ` Jl