Article I. General Provisions
11.120.010 Introduction.
The purpose of this guideline is to provide the basic requirements and design features for low-flow wastewater pumping stations using pump-motor units of the submersible nonclog type or of the submersible grinder type. It has been compiled as an aid to consulting engineers in the engineering and design of such stations. It is recommended that the WSSC and the consultant review the applicability of these requirements and design features and the need for any modifications before the design of any pumping station of this type is started.
Wastewater pumping stations using submersible nonclog or submersible grinder pumps may be used under the following conditions:
(a) Station peak flow is less than 1,000,000 gallons per day (694 gpm) for submersible, nonclog pumps.
(b) Station peak flow is less than 72,000 gallons per day (50 gpm) for submersible grinder pumps.
(c) Station total dynamic head does not require two pumps in series.
(d) Station depth from grade to wetwell bottom is no more than 25 feet.
(e) Weight of pump unit does not exceed 1,500 pounds. (Design Guideline DG-08 § 1.0, dated August 2006)