Q: How do you calculate rainwater runoff to determine culvert size?

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Runoff causes sheet erosion which means removing a thin sheet of topsoil.

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strip cropping reduces soil erosion due to rainwater runoff and wind.

Ponds form where rainwater and runoff meet in a depression in the landscape.

All rivers are fresh-water - because they're formed from rainwater runoff, which fell as rain.

You find the speed.

Excess rainwater will runoff when the ground is either saturated and cannot soak up any more rain the surface is impervious and cannot hold any water

You take the footprint of the rainfall (length feet multiplied by the width feet) and multiply by the rainfall feet ( inches divided by 12). This is your volume. Take this number and multiply it by 7.48 to determine the gallons of water! You forgot to add in the volumetric runoff coefficient. this is measured by: VRC= 0.05 +0.009(% imperviousness)

New construction allowed runoff from hillsides which flooded basements in nearby homes.Runoff naturally seeks a path of least resistance.Continual runoff can undermine hills, leading to mudslides and ground failures.