HomeMy WebLinkAbout6.7-307 3101 N. SILLECT AVE. # 103 | BAKERSFIELD, CA 93308 | TELE: 661.859.1923 | FAX: 661.859.1376
Inlet Drainage Calcs For:
11901 Bolthouse Drive
(GP# 20-40000061)
Seven Oaks Business Park
Single Story Office Complex
Prepared by: John H. Hulson, Sr.
Report Date: 05/03/2021
Seven Oaks Business Park
11901 Bolthouse Drive – Proposed Commercial Site
Christy Concrete Drain Boxes
Christy Concrete U21 Drain Box- 2'x2' (576 sq in)
576 sq in - 140 sq in of grating= 436 sq in
Assumed grate 1in deep therefor 436 sq in * 1 in depth = 436 cu in
436 cu in x 3.118 gallons per cu in per minute= 1,359 gpm (per Christy Concrete)
1,359 gpm I 60 = 22.66 gallons per second
22.66 gallons per second I 7.48 gallons per cu ft= 3.03 cfs {100% clear)
Capacity If Grate 50% blocked = 1.51 cfs {50% blocked)
In conclusion the largest drainage contribution in a drop inlet for this site is 1.32 cfs for Sub-Area 1 and
Drop Inlet #1.
INLETSSN Element Inlet Manufacturer Inlet Number Catchbasin Max Max Ponded Grate Roadway Roadway Gutter Gutter Gutter Median Peak Peak Allowable Max Gutter Max Gutter Max Gutter Time ofID Manufacturer Part Location of Inlets Invert (Rim) (Rim) Area Clogging Cross Manning's Cross Width Depression Ditch Flow Lateral Spread Spread Water Elev. Water Depth MaximumNumber Elevation Elevation Offset Factor Slope Roughness Slope Manning's Inflow during during during DepthRoughness Peak Flow Peak Flow Peak Flow Occurrence(ft) (ft) (ft) (ft²) (%) (ft/ft) (ft/ft) (ft) (inches) (cfs) (cfs) (ft) (ft) (ft) (ft) (days hh:mm)1 DROPINLET‐#1 CHRISTY U‐23 On Sag 1 341.16 348.82 7.66 10.00 50.00 0.0200 0.0160 0.0620 2.00 2.0000 45.0000 1.32 1.32 7.00 8.65 349.24 0.42 0 00:112 DROPINLET‐#2 CHRISTY U‐23 On Sag 1 342.61 349.26 6.65 10.00 50.00 0.0200 0.0160 0.0620 2.00 2.0000 45.0000 1.03 1.03 7.00 7.23 349.66 0.40 0 00:10Page 1
PIPESSN Element From (Inlet) To (Outlet) Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Manning's Peak Time of Max Travel Design Max Flow / Max Total Max ReportedID Node Node Invert Invert Invert Invert Drop Slope Shape Diameter Roughness Flow Peak Flow Time Flow Design Flow Flow Depth / Time Flow ConditionElevation Offset Elevation Offset or Height Flow Velocity Capacity Ratio Total Depth Surcharged DepthOccurrence Ratio(ft) (ft) (ft) (ft) (ft) (ft) (%) (inches) (cfs) (days hh:mm) (ft/sec) (min) (cfs) (min) (ft)1SD‐01 DROPINLET‐#1 EX‐MH 78.00 341.16 0.00 341.02 0.00 0.14 0.1800 CIRCULAR 18.000 0.0110 2.16 0 00:11 2.58 0.50 5.26 0.41 0.48 0.00 0.72 Calculated2SD‐02 DROPINLET‐#2 DROPINLET‐#1 289.00 342.61 0.00 341.16 0.00 1.45 0.5000 CIRCULAR 18.000 0.0110 0.98 0 00:10 1.68 2.87 8.79 0.11 0.37 0.00 0.55 CalculatedPage 1
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