Comment:

This variable pertains to optional Conservation Practices provided by NTT. This variable is constant with respect to the Crop type for the specific application. Water and sediment control basins (WASCOBs), or ponds, consist of an embankment across the slope of a field or minor waterway to temporarily detain and release water through a piped outlet or through infiltration. They are constructed perpendicular to the flow direction and parallel to each other. WASCOBs are usually installed in areas where the land is relatively steep and undulating. They detain water from contributing areas, inducing sedimentation and controlling the release of water, thereby reducing the erosive power of the water downstream. Additional benefits are settling of sediment-bound pollutants and some infiltration. Only one input is required for ponds: fraction of area controlled by ponds. This is the fraction (a value between 0 and 1) of the field runoff that flows through (is controlled by) the pond/WASCOB. As modeled, ponds only treat runoff that originates in this field. Inflow from other fields is not routed through the ponds. Ponds/WASCOBs are assumed to be within field.