Fix Your Drainage Problem — No Engineering Degree Required
Free calculators and guides to help you figure out what you need, whether you're DIYing or hiring a contractor. Tell us your problem and we'll point you to the right tool.
What's Your Problem?
Pick the issue closest to yours and we'll show you the right tools.
My yard is always soggy
Standing water, puddles that won't go away, or grass that stays wet for days.
Water in my basement
Seepage, dampness, or flooding in the basement after rain.
Driveway or patio floods
Water pools on paved areas and takes a long time to drain.
Gutters overflow
Gutters can't keep up during heavy rain, or downspouts are too small.
Recommended Calculators for Homeowners
These tools are designed to be easy to use with clear explanations at every step.
French Drain Calculator
Enter trench, aggregate, pipe, and soil parameters to calculate French drain storage, infiltration, and pipe capacity using Darcy's law and Manning's equation.
Open CalculatorRain Garden Calculator
Calculate rain garden sizing for stormwater management.
Open CalculatorDownspout Sizing Calculator
Enter roof area and rainfall intensity to select round or rectangular downspout sizes from IPC sizing tables.
Open CalculatorCatch Basin Calculator
Enter design inflow and inlet geometry to estimate HEC-22 weir/orifice inlet capacity, then screen outlet-pipe capacity with Manning's equation and preliminary basin and sump dimensions.
Open CalculatorDry Well Calculator
Calculate dry well sizing for stormwater infiltration.
Open CalculatorGutter Flow Calculator
Enter gutter shape, dimensions, slope, and roughness to calculate flow capacity, velocity, hydraulic radius, and Froude number with Manning's equation.
Open CalculatorRoof Drain Sizing Calculator
Enter roof area and rainfall intensity to select primary drains, overflow drains, and scuppers from IPC sizing tables.
Open CalculatorSump Pump Calculator
Calculate sump pump capacity and pit sizing for basement drainage.
Open CalculatorFoundation Drain Calculator
Calculate foundation drain sizing for basement and crawlspace waterproofing.
Open CalculatorTrench Drain Calculator
Calculate trench drain capacity using Manning's equation.
Open CalculatorLearn How Drainage Works
Short articles that explain drainage concepts in plain English.
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