Buffalo RainHarvesters
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Interactive planning tool

Find the tank that fits your property.

Model a full year of rainfall, roof capture, water use, and tank storage. Adjust the numbers to see where water is gained, used, and lost.

Texas rainfall presetsLive monthly balanceNo sign-up required
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Live results

Your water balance

Good fit
0%Demand met

Storage reliability

Calculating your system…

Annual harvest—gallons captured
Annual demand—gallons required
Overflow—gallons not stored
Dry months—months below demand

Month by month

Rain in. Water out. Storage carried forward.

CapturedDemandTank level

Recommended starting point

— gallon tank

Plan my system

How it works

A clearer way to size storage.

  1. 1

    Rain becomes yield

    Every inch on one square foot of roof can provide about 0.623 gallons before system losses.

  2. 2

    Demand draws it down

    Your daily use is applied across each month so seasonal dry periods become visible.

  3. 3

    Storage bridges the gap

    The model carries water forward and tests tank sizes to find a practical reliability target.