# Changes

## Check dams

, 1 year ago
m
Sizing and spacing of check dams
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<div style="float: right">{{#widget:WolframAlpha|id=a04d99bf6eaf9309e13e0b359f7368e2}}{{#widget:WolframAlpha|id=edc4fd3f7f54774d9ab0471f34d6041c}}</div>
To estimate the depth of water that can be infiltrated into a surface within a given time::
$y=f\times t$
After surveying the longitudinal profile of the swale, the number of check dams for the swale can be calculated by using the following equation:
:$Number\ of\ dams= \frac{L\left ( S_{i}-S_{e} \right )}{h}$
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