Explore tools
See how water moves around a property.
Fourteen interactive tools from FAS. Some do simple arithmetic with numbers you enter, like gallons off a roof. Others are drawings you can change to see a principle, like which way the ground should slope.
These tools explain general ideas. They don't look at your property, diagnose a problem or certify a design, and they are separate from the Water MRI property assessment.
How much water comes off my roof?
Calculators for storm volume and flow from your own measurements.
- CalculatorStart here
Roof rain in a storm
Roof area, rainfall rate and storm length give total gallons and average gallons per minute.Explore - Calculator
Roof runoff volume
How many gallons a roof sheds for a given depth of rain.Explore - Calculator
Runoff from roof, paving and lawn
Adds separate surfaces, each with its stated coefficient, into one runoff-rate estimate.Explore
How does rain get inside?
Example paths only. It can't tell which path, if any, affects your building.
What do foundation changes look like?
Observation only. No diagnosis, severity score or repair estimate.
Where does water go across my yard?
Drawings you can change to see direction, cover and interception.
- Interactive illustrationStart here
The first ten feet
Set how far the ground falls away from the wall and see which way water heads.Explore - Interactive illustration
Slope and cover
Compare bare soil, mulch and grass on a slope you adjust.Explore - Interactive illustration
Channel drain across a driveway
Switch a channel drain on or off in rain or a downpour and watch where sheet flow goes.Explore
How do drain pipes keep flowing?
A worked pipe example, a sediment story and a stone-volume calculator.
- Worked example
Pipe slope
Change the grade and pipe roughness on a 4-inch example pipe to see fall and velocity change.Explore - Story illustration
Five Florida summers
A year-by-year story of sediment collecting inside a drain pipe, with play, pause and reset.Explore - Calculator
Aggregate volume
Length, width and depth give cubic feet and cubic yards for a rectangular trench or bed.Explore
What happens below ground?
Illustrations of groundwater and pumping, plus a pit-volume calculator. None of them sizes a pump.
- Interactive illustration
Wellpoints and the water table
Compare no drainage, gravity drainage and wellpoints as the water table changes depth.Explore - Interactive illustration
Sump pump cycle
Watch fill and pump-out cycles in light, steady or storm rain, with power on or off.Explore - Calculator
Sump pit volume
Diameter and depth give the gallons a round pit holds, before any equipment inside it.Explore
Tools explain. A visit looks at your property.
Every tool here shows a general principle or does arithmetic with the numbers you type. If you want FAS to look at what is actually happening on your property, start with what you are noticing.