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425-4 . After determining depth of pond required to contain manure, waste water, the normal 25-year frequency runoff, and solids accumulation, a minimum of 2.0 feet additional depth shall be provided to contain the normal and 25-year, . .:. 24-hour precipitation falling directly on the pond surface after allowing for (7 . evaporation and freeboard. This allows for 1.0' of freeboard for a 1-year ;• design period. - , Table 6 is a guide to determine the normal runoff for the storage pond. • Additional storage may be provided to meet management•- g goals or regulations. Separation of precipitation. Precipitation which collects on solid waste - storage ponds must be drained or pumped away when conventional manure handling ;equipment is used for removal of the wastes. _ This polluted runoff must be _ collected and disposed of in a safe manner. Picket dams may be used to separ- . gate the water resulting from precipitation when the manure contains bedding. - . The pickets should be placed vertically and designed to withstand a horizontal • loading at least equal to 45 pounds per cubic foot. The picket dam should extend up the ramp to a point where the wastes are first removed. The dis . - charge through picket dams shall be collected and stored until disposal . ` Settling Basin Capacity. The capacity of the settling basin or channel shall - - be sufficient to pass the peak runoff for a 25-year frequency, 24-hour storm to the holding pond in addition to providing capacity for solids removed from _ • the runoff. Where solids are stored separately or the solids are removed regularly from the lot, a settling basin may be used. When the settling basin is cleaned after each significant storm a capacity equal to 0.5-inch L runoff from the lot area should be provided. When the settling basin is not ' cleaned regularly, the capacity may be calculated using 0.2 to 0.5 cubic feet - per day for each_animal Unit. - V - .V Channels or terraces used as settling basins should have side slopes 2:1 or ' flatter. The channel shall be designed to provide a design velocity of 1 foot _ per second or less for runoff for a 10-year frequency, 24-hour storm. Settling basins should have paved bottoms to facilitate cleanout. Inlet and outlet. Inlets to storage ponds may be of any permanent type designed to resist erosion, plugging, and damage by ice. If slurry and solid waste is stored, the inlet must be designed so that waste will be deposited near the center of the pond. _ There shall be no outlet that can automatically release- storage storage from the design volume. An emergency spillway, combination of spillways, or additional storage shall be provided to protect the facility from overtopping during a 25-year, 24-hour storm occurring when the design volume is filled. Spillway requirements, however, do not apply to waste storage ponds without drainage areas. USDA-SCS-Wisconsin Section IV • Technical Guide 10/83