First flush calculator

First Flush is the initial surface runoff from rainwater. Pollution will wash off impervious surfaces and is likely to be at a higher concentration for this initial period and is referred to as ‘Pollution Shock’. The purpose of the First Flush Calculator is to allow users to establish these pollution values for an initial disposal of water.

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HOW MUCH RAINWATER TO DIVERT?

Estimate based on the size of your collection surface easily using this tool.


Total Square Feet



Total Feet of Flush Pipe



Total Flush Weight

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First Flush Calculations


First Flush Summary

Description Information Quantity Measurements
Discount :
Total Flush Gallons :

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