Photo: Dave Jenkins, CPESC The sample on the left is just under 1 NTU , the middle is 25 NTUs, and the one on the right is 250 NTUs. In Washington state, the Construction Storm Water General NPDES Permit lists benchmarks that construction discharges must meet. These are: 0-25 NTUs everything...
Check dams are used in ditches to slow the velocity of flowing water, reducing erosive potential. An additional benefit of check dams is to allow some sedimentation in the ponded water behind the dam. Sand and some larger silt can be removed using check dams; colloidal particles ...
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