Buffalo RainHarvesters
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Water quality planning tool

Size the dirty water out.

Calculate how much roof runoff to divert, then make sure the chamber actually fits your downspouts, pipe, and available space.

Texas-ready unitsLive chamber sizingProduct guidance
02

Live recommendation

Your first-flush plan

Practical fit

Recommended diversion

0gallons per rain event

Calculating your first-flush plan.

Low pollution0.25 mm of roof wash diverted
Per diverter0 gal4 equal chambers
Pipe required0 ftper 4 in chamber
Capacity available0 galper 12 ft chamber
Chamber runs1per diverter location

Recommended configuration

First Flush Plus 4 in

The calculated chamber fits the selected installation.

WDDP111Qty 4Just add chamber pipe
Plan this system
Use this loss in the tank calculator

What the result means

The chamber fits without additional runs.

  • 01

    The roof profile is currently assessed as low pollution.

  • 02

    The total volume is divided evenly across four downspouts.

  • 03

    The required chamber length fits within the available straight-pipe height.

Simple math, practical result

From roof wash to a buildable chamber.

  1. 1

    Assess the roof

    Nearby trees, animals, dust, traffic and maintenance change how much initial runoff should be discarded.

  2. 2

    Calculate the wash

    One millimetre of rain over one square metre produces one litre, so roof area and diversion depth establish the target volume.

  3. 3

    Test the hardware

    The calculator converts gallons into chamber length and checks the result against the number of downspouts and available space.