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STORM DRAIN COMPUTATION SHEET Click When Declare Datatype of Drain (ft/ft)Manhole Invert Follower Engineer Elev. Upper InDesign FlowVelocity (ft/s) Flowing FullCapacity Fill (CFS)Diameter Pipe (in.)
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How to fill out storm drain computation sheet

How to fill out storm drain computation sheet
01
Start by gathering all the necessary information for the storm drain computation sheet.
02
Begin by entering the project information such as project name, location, and date.
03
Determine the design rainfall intensity for the specific project location and enter it on the sheet.
04
Calculate the total drainage area for the project by measuring the area contributing to the storm drain system.
05
Determine the runoff coefficient for the project area based on the land use type and enter it on the sheet.
06
Calculate the rational method peak flow rate by using the formula Q = CiA, where Q is the peak flow rate, C is the runoff coefficient, and A is the drainage area.
07
Enter the calculated peak flow rate on the storm drain computation sheet.
08
Identify the design storm frequency, such as 10-year, 25-year, or 100-year storm, and enter it on the sheet.
09
Calculate the design storm flow rate by multiplying the peak flow rate with the appropriate storm frequency factor.
10
Verify the storm drain pipe size and slope requirements based on the calculated design storm flow rate, and enter them on the sheet.
11
Ensure that the sheet includes details about pipe materials, manhole spacing, invert elevations, pipe sizes, and any additional specifications.
12
Review the completed storm drain computation sheet for accuracy and make any necessary adjustments before finalizing it.
Who needs storm drain computation sheet?
01
Civil engineers and stormwater management professionals
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What is storm drain computation sheet?
The storm drain computation sheet is a document used to calculate the capacity and design requirements for storm drains.
Who is required to file storm drain computation sheet?
Civil engineers or developers responsible for designing storm drain systems are required to file the storm drain computation sheet.
How to fill out storm drain computation sheet?
The storm drain computation sheet is filled out by inputting calculations for storm drain capacity, design parameters, and hydraulic analysis.
What is the purpose of storm drain computation sheet?
The purpose of the storm drain computation sheet is to ensure that storm drain systems are designed correctly and can handle the anticipated flow of stormwater.
What information must be reported on storm drain computation sheet?
Information such as pipe sizes, slope calculations, design rainfall intensities, and drainage area characteristics must be reported on the storm drain computation sheet.
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