Designing selecting and operating a storm drainage pumping system

Author(s): J. Chowdhury
ESE Magazine, March 1, 2013

Abstract

In a typical storm drainage pumping system, the run-off from a drainage area is collected in a convergence manhole (MH) before entering the pump station’s wet well. It is then pumped directly to a discharge MH through a force main header and flows to a natural stream through a short length gravity sewer and headwall.

The drainage system should be designed for a 100 year storm or regional flood, with 100% redundancy in pumping capacity. It is recommended that at least two pumps run simultaneously during 100 year storm flow conditions, with one pump operating during normal conditions.