90 days total runoff from paved areas. 90 days total runoff from earthen areas. For longer storage periods, the runoff amount should be increased by factors shown in Table 2. Holding ponds are usually emptied with irrigation equipment. Construction of Runoff Controls Proper construction of the runoff control system is essential.
Most contractors are familiar with methods of constructing holding ponds.
However, settling basins and infiltration channels are relatively new, and care should be taken to insure that certain guidelines are followed. One wall of the basin should be reinforced so that it can be used as a bucking wall. Depth of the basin should be limited to 2 feet. If long term storage of the settled solids is needed, surface area of the basin should be enlarged. If the settled solids will be handled with liquid manure equipment, the basin can be deeper than 2 feet.