(A) General requirements. The subdivider shall install a water supply system capable of providing domestic water use and fire protection. The subdivider shall connect to the municipal water supply system except in cases of hardship, as determined by the MPC. Where the developer does not connect to the municipal water system, the developer shall provide an adequate potable water source to serve all of the lots.
(B) Specifications. The construction of and the materials used in the construction of all water supply systems shall be in accordance with the city specifications and standard plans, the Oklahoma Department of Health standards and applicable American Water Works Association standards. As a general standard, water lines shall be constructed of cement lined class 50 ductile iron pipe or polyvinyl chloride pipe meeting AWWA standard C-900 DR 14. Other pipe materials or grades may be used when approved by the City Engineer.
(C) Design of water lines.
(1) The water distribution system shall consist of grid lines (supply mains and arteries), distribution lines (feeders) and service lines.
(2) Grid lines shall be sized and located in conformance with the master supply plan.
(3) In general, distribution lines shall be located in accordance with city policies and within all street rights-of-way and easements so as to provide service to all lots. Distribution lines shall be a minimum of six-inch nominal internal diameter size except on short cul-de-sacs and in high value commercial areas. Distribution lines shall be a minimum of four inch nominal internal diameter on short cul-de-sacs and a minimum of eight inch nominal internal diameter in high value commercial areas. Distribution lines should generally be cross connected at intervals not exceeding 600 feet. Dead end lines should be avoided. Where provided, dead end lines shall be designed with a flushing device at the end.
(4) Gate valves should be located so that individual distribution lines can be isolated and so that a single break in the line will require no more than 500 feet of pipe to be disconnected from service in high value areas, no more than 1,000 feet in other areas. All distribution lines should be valved at the connection to the grid lines. The locations of valves should preferably be at street intersections with valuing provided to isolate individual fire hydrant taps.
(5) In areas not included in the master water plan, the distribution system shall be designed so that negative pressure will not occur under any conditions of draft on the system. The distribution lines shall be designed to maintain a minimum pressure of 40 pounds per square inch and a maximum pressure of 120 pounds per square inch static pressure. The “Hardy Cross” method shall be used to calculate the pressure.
(6) The water distribution system should be designed to avoid areas of conflict with utilities, storm sewers and sanitary sewers. Locations of all water lines and appurtenances shall be accurately dimensioned on the construction plans.
(7) The construction plans shall have the construction of any utilities going under streets noted to be constructed previous to the final surfacing of the street.
(D) Fire hydrants. The location of fire hydrants shall be in accordance with the city policy; generally fire hydrants shall be located at street intersections accessible from four directions. The fire hydrant must be set to match the final grade before acceptance by the city. Acceptable manufacturers: Mueller-Centurion, U.S. Pipe Metropolitan, Kennedy-K81A or city approved equivalent.
(1) For single-family and two-family residential areas not exceeding two and one-half stories in height, spacing shall be 500 feet to 600 feet.
(2) For all types of development, required fire flow shall first be estimated by the formula:
F = 18C(A)0.5 where:
A = The estimated total floor area in square feet;
F = The required fire flow in gpm; and
C = Coefficient related to type of construction as tabulated below:
Type Of Construction | C Value | Maximum Fire Flow (gpm)
|
Fire resistant | 0.6 | 6,000 |
Heavy timber | 0.9 | 8,000 |
Noncombustible | 0.8 | 6,000 |
Ordinary | 1.0 | 8,000 |
Wood frame | 1.5 | 8,000 |
For combinations of the above types of construction, C values may be interpolated; coefficients shall be between the limits of 1.5 and 0.6 | ||
(3) Greater fire hydrant spacing may be permitted if the applicant submits technical evidence that required fire flows can be maintained. The Planning Commission may require closer fire hydrant spacing if conditions exist which would necessitate more fire hydrants.
(E) Chlorination. After the line has been constructed and pressure tested, it shall be chlorinated in accordance with the OSDH requirements. The subdivider shall provide access to the line, taps, blow offs, and assist the city, as necessary, to chlorinate the line. The city will perform the work of chlorinating the line including the disinfectant and submitting the samples to the OSDH for testing.
(F) Service line crossings. The subdivider shall be responsible for excavating and backfill of the trenches required for the service lines crossing the roadway. The subdivider shall coordinate with the city the schedule for installing the service lines after the line has been successfully chlorinated.
(G) Street divider or planter type areas. The subdivider shall install water lines to each section of street divider or planter type area. Lines shall be a minimum of two inch nominal internal diameter.
(Prior Code, § 11-7-3) (Ord. 594, passed 8-5-1997)