Determination of Pipe Drain Spacing

This specialist calculator helps to provide a quick answer to Hooghoudt's drain spacing Equation

Depth of Topsoil/Rootzone (mm)
Hydraulic Conductivity of Topsoil/Rootzone (mm/hr)
Design Drainage Rate for removal of water (mm/hr)

Maximum Drain Spacing metres

N.B. If the result is less than 4 metres then it will probably be more cost-effective to use a different design scheme such as a sand-gravel slit scheme.

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