Financing Options

Click here for the Northland Capital Application

Click here for the Stearns Bank Application

Drainage Calculations and Formulas

Drainage Coefficient

A drainage coefficient is a design parameter that specifies the capacity of a drainage system. It’s typically expressed as a fraction of an acre-inch of water that the system can remove from the soil in a 24 hour period.

EX: If you have a 1/2" drainage coefficient, the drainage system is designed to remove 1/2" of water from the soil in a 24 hour period.

Figuring Grade and Slope

Figuring Grade & Slope

Grade = Rise over Run x 100%

Slope = Rise over Run

Using Decimal Ft.
1.0' / 1000' = 0.001 X 100 = 0.1% Grade

1.0' / 4.0' = 25% Slope or 1:4 Slope

Ft/Ac of Tile Patterns

Spacing - Ft/Ac

10' - 4,356'

20' - 2,178'

30' - 1,452'

40' - 1,089'

50' - 871'

60' - 726'

70' - 622'

80' - 544'

100' - 435’

Installation Cost Calculator

Ft/Ac x $/ft Pipe & Fittings + $/ft Labor/Equipment

871' x $.50 + $.25 = $653.25/Ac

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