(A) Design requirements. Water systems shall be designed, constructed and tested in accordance with the current editions of circular DEQ-1 - Montana Department of Environmental Quality Standards for Water Works and the Montana Public Works Standard Specifications and these specifications.
(B) Design report.
(1) All water main extensions will require the engineer of record to submit a written report to the Public Works Department (PWD) addressing the fire and domestic flow requirements.
(2) For residential or non-residential developments that will utilize an average daily flow of less than 25,000 gallons at build-out, the report shall include data on test results at the nearest hydrant which shows the static pressure at zero flow from the hydrant and the residual pressure with available flow from the hydrant.
(3) At the discretion of the PWD, the design engineer may be required to conduct hydraulic modeling to demonstrate compliance with the flow and pressure requirements set forth in this section.
(4) For residential or non-residential developments that will utilize an average daily flow of 25,000 gallons or more at build-out, or that require utilization of a pressure booster pump(s), the report will be required by the PWD to include hydraulic modeling results that show the adequacy to meet fire and domestic flow and pressure requirements of this section.
(5) The normal operating range of pressure allowed for water system design is 50-110 psi or as approved by the PWD without the use of booster or fire pumps.
(Prior Code, § 11.05.020.010) (Ord. 2019-9, passed 9-3-2019; Ord. 2021-15, passed 12-20-2021)