Drain outlet rear

Precise elevation drops are important for proper water flow while maintaining maximum pipe coverage. Here, the outlet at the curb was already set at no more than half an inch above the outflow lip. It establishes where all upstream pipes must connect. Minimal intrusion into future landscaping was the objective, so the long straight run was kept at 1 percent slope. The shorter leg coming down to it is at 10 percent, which should provide plenty of flow momentum.

See inlet trench drain for more information.