Plumbing Tools

Drainage Calculator

Calculate drain pipe size for stormwater, downspouts, and surface drainage. Based on rainfall intensity and drainage area.

Drainage Area Parameters

Drainage Area (sq ft)

Surface Type

Rainfall Intensity (in/hr)

Pipe Slope (%)

Pipe Material

Application

                                Min Pipe Size
                                -

Flow Rate 0 GPM

Adjusted Runoff Area 0 sq ft

Runoff Coefficient 0.95

Pipe Capacity 0 GPM

Velocity 0 FPS

Gravel/Catch Basins 0

Est. Material Cost $0

Q = CIA

C = Runoff coefficient

I = Rainfall intensity

A = Area (acres)

Q = Flow (cfs)

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