(A) Criteria.
(1) The criteria in this section are for extending the water system in a uniform, adequate and reliable manner.
(2) Standards and specifications for materials and construction methods to be used for water distribution installations are on file with the village.
(B) Overall plan. The village’s long range water distribution system plan shall be followed.
(C) Computations.
(1) All water supply demands on the village system shall be indicated.
(2) Calculations of pressure drops within the proposed distribution system during average hourly, peak hourly and fire flow demands shall be provided to substantiate the selection of water main sizing.
(D) Design approval. The Village Engineer shall approve all designs and shall alter the following design requirements as necessary to meet the village’s water system plan.
(E) Water main coefficient of roughness. The design basis for water system designs in the village shall be from the Hazen and Williams method for computation. A coefficient of roughness (C) shall equal 120 for new installations.
(F) Fire protection supplies. In order to design proper water supply for fire protection purposes and for domestic consumption, the following are considered by the village as methods for arriving at flows necessary.
(1) Public fire flow requirements (Fire Department pumper supply) and domestic consumption demands are cumulative.
(2) Fire flow requirements used will be approved by the village. However, the following guidelines are suggested.
(a) Manufacturing and storage: 3,000 to 5,000 gpm;
(b) Institutional: 3,000 to 4,000 gpm;
(c) Commercial and mercantile buildings: 3,000 to 4,500 gpm;
(d) Business and office uses: 2,500 to 3,500 gpm;
(e) Single-family detached residential homes: 1,000 to 1,500 gpm;
(f) Town or row house construction: 1,500 to 2,000 gpm; and
(g) Apartment buildings: 3,000 to 4,000 gpm.
(3) The minimum residual pressure in the proposed system shall be 20 psi during a fire flow event. The Village Engineer will furnish the expected static pressure at the point of connection(s).
(G) Minimum size of water mains. Minimum size of water mains shall be as follows:
(1) Detached single-family residential area: six inch diameter with interconnecting loops of eight inches in diameter or larger.
(2) Other than detached single-family residential developments, including town/row houses and apartment buildings: minimum eight inches in diameter water mains with interconnecting mains of eight inches or larger diameter.
(3) Other uses, excepting for small isolated developments: minimum size water mains shall be ten inches in diameter.
(H) Valves. Valves shall be located so as to effectively isolate system with minimum disruption. The following guides shall be considered.
(1) Valves shall be installed so that not over 500 to 700 feet of main will be shut off at any given time.
(2) Where a “tee” is installed, at least two valves will be utilized. Their location will be based upon location of other valves in the system.
(3) Where a “cross” is installed, at lease three valves will be utilized. The valves shall be located with relation to other valves in the system.
(I) Gridiron or looping. Gridiron or looping shall be as follows:
(1) Each six-inch diameter water main shall be looped at a distance not to exceed 600 feet.
(2) Eight-inch diameter water mains shall be looped at distances not to exceed 1,000 feet.
(3) Ten-inch and larger water mains shall be looped at distances not to exceed 2,000 feet by ten-inch or larger mains.
(4) No dead ended water mains are allowed.
(J) Fire hydrant location. Fire hydrant installation for all areas, including buildings set back from public water supplies, shall be as follows:
(1) Fire hydrants shall be installed along public streets or easements so that no portion of a building will be over 300 feet from a public fire hydrant. In general, linear hydrant spacing will not exceed 350 feet in single-family areas, nor 300 feet elsewhere.
(2) Hydrant location will be so that:
(a) No portion of the building will be over 300 feet from a fire hydrant;
(b) In addition to other requirements, the fire flow divided by 750 equals the number of hydrants necessary within 500 feet of a building; and
(c) A flow of 1,000 gpm from each fire hydrant will be provided.
(3) Hydrants shall be located so that:
(a) Hydrants shall be located approximately ten feet from an all-weather roadway;
(b) Hydrants shall be located approximately 50 feet from the buildings, if practical; and
(c) Access to hydrants shall be by all-weather routes adequate in width, clearance and strength for all units. The routes shall be maintained during all seasons of the year.
(1981 Code, § 22.311) (Ord. 88-15, passed 11-7-1988)