Equal in importance to flush volume is the rate at which the flush tank or valve discharges the flush water into the flush gutter. Adequate flush volume will not provide cleaning if that volume is not discharged fast enough. Flush tanks and valves should be designed to discharge the required flush volume in about 10 seconds. Gutters longer than 150 feet may require a longer discharge time to maintain an adequate flush wave in the gutter. This allows facilities to be built on the desired slope for flushing with a minimum of earth moving.
Buildings can have a roof-line on the same slope as the foundation.
Adequate slope from the flushed facilities to the lagoon eliminates any need for pumping waste to the lagoon. The site must be suitable for construction of a lagoon according to the state regulator's requirements, and it must have sufficient clay in the soil to provide a watertight seal for the lagoon. References MWPS-7, Dairy Housing and Equipment Handbook . Midwest Plan Service, Iowa State University, Ames, Iowa 50011. Midwest Plan Service, Iowa State University, Ames, Iowa 50011.