(1) Drains.
- (a) A means shall be provided for the draining of drinking water storage tanks.
- (b) Where possible, the drain shall be separate from the outlet pipeline. If a tank drain line is provided, it shall be sloped for complete drainage.
- (c) The drain shall not discharge to a sanitary sewer.
- (d) If local authority allows discharge to a storm drain, the drain discharge shall have a physical clearance of at least 12 inches between the discharge end of the pipe and the overflow rim of the receiving basin.
(2) Internal Catwalks.
Internal catwalks, if provided and located over the drinking water, shall have a solid floor with raised edges. The edges and floor shall be designed so that shoe scrapings or dirt will not fall into the drinking water.
(3) Inlet and Outlet.
- (a) To minimize potential sediment in the flow from the tank, the outlet pipes from all tanks shall be located in a manner to provide a silt trap prior to discharge into the distribution system.
- (b) Inlet and outlet pipes shall be configured to provide mixing and circulation.
(4) Tank Floor.
The floor of the storage tank shall be sloped to permit complete drainage of the structure.
The following shall apply to internal features of drinking water storage tanks:
KEY: drinking water, storage tanks, access, overflow and drains
Date of Last Change: November 10, 2014
Notice of Continuation: February 10, 2025
Authorizing, and Implemented or Interpreted Law: 19-4-104