Make a rough flood risk estimate from rainfall amount, storm duration, surface runoff, drainage condition, ground saturation, slope, nearby water, and local elevation. This calculator is for basic planning and awareness only.
Rainfall and duration:
The calculator estimates rainfall intensity from the total rain amount and storm duration.
Runoff potential:
Surface type and runoff coefficient estimate how much rain may flow over the ground instead of soaking in.
Site conditions:
Drainage, ground saturation, slope, nearby water, and elevation are added to the risk score.
Risk score:
The result gives a rough score from 0 to 100 and a general risk level.
A flood risk estimate calculator is useful for basic storm planning, yard drainage awareness, basement risk checks, driveway runoff planning, low-spot evaluation, and understanding how rainfall and site conditions affect flood potential.
This is only a rough educational estimate. Real flood risk depends on official flood maps, rainfall forecasts, stream gauges, storm drains, elevation data, soil, land use, and local emergency conditions.
Your result estimates flood risk using a scoring method. Higher scores mean more conditions are present that can contribute to flooding, such as intense rainfall, high runoff, poor drainage, saturated ground, flat terrain, nearby water, or low elevation.
This calculator estimates flood risk by scoring rainfall intensity, runoff potential, drainage, ground saturation, slope, nearby water, and elevation.
Heavy rainfall in a short time, poor drainage, saturated soil, low elevation, and nearby rivers or coastal water can raise flood risk.
No. This is a rough planning calculator. Use official flood maps, local emergency management, and weather alerts for actual flood decisions.
Yes. Local drainage problems, blocked culverts, flash flooding, extreme rainfall, and changes in terrain can cause flooding outside mapped flood zones.