Part 5 — Requirements of Service, Design and Construction[Added by Ord. 75-13]

In applying the minimum requirements found in this Ordinance for design and construction of a water system, consideration shall be given to the quantity of water pumped and stored, the adequacy and dependability of all water works facilities, the physical conditions known to exist at the time and place of installation and the probable operating requirements.

As used in this chapter the letters "p.s.i.g." mean pounds per square inch gauge.

All facilities of the water system shall be designed and constructed to withstand, with ample safety factors, the physical stresses to which they will be subjected and shall be free from structural and sanitary hazards. All equipment shall be of adequate size and capacity and shall be correlated with available supply from the source facilities and storage to meet the requirements of Section 7451.1 (Flow Requirements).

The required total water flow for any given service area under consideration or unit water system shall be the sum of the minimum fire flow plus the maximum daily water flow requirements. The maximum daily water flow requirement shall be either 2 times or 4 times the average daily water flow requirement depending on whether the water system is to be metered or unmetered.

Qt. equals Qf plus 2Qd for metered service.

Qt equals Qf plus 4Qd for unmetered service.

Qt equals the required total water flow in gallons per minute

Qf equals the minimum fire flow water requirement in gallons per minute.

Qd equals the average daily water flow requirement in gallons per minute, which is the sum of residential or domestic water flow requirements plus the commercial, industrial, irrigation or other uses.

The average daily water flow requirement in gallons per minute in the water system described in the application for water utility authorization shall be obtained by multiplying the estimated daily water consumption in gallons per capita, times the total estimated population to be served and dividing by 1440. In no case shall the average daily design flow consumption per capital be less than 100 gallons per day at a normal operating pressure of not less than 35 p.s.i.g. Supporting data shall be submitted with the application for water utility authorization.

The average daily flow requirement in gallons per minute in the water system described in the application for water utility authorization shall be determined and supporting data thereon shall be submitted with the application.

The minimum fire flow water requirement shall be determined by the Fire Chief. The computation shall be based upon a minimum of 20 p.s.i.g. residual operating pressure in the street mains from which the flow is measured at the time of measurement. The Fire Chief shall be guided by but may adjust quantities set forth in the following table on the basis of location conditions, exposure, congestion and construction of buildings.

Text read from an image; its layout may differ:
Fire Flow Duration
Building Classification Requirements Requirements Fire Hydrant Spacing
A. SINGLE FAMILY DWELLINGS:
One story 1000 gpm 2-4 hrs. 660 ft.
Two stories 1250 gpm 3-4 hrs. 660
B. MULTIPLE RESIDENTIAL TWO STORIES OR LESS
Building size in square feet on first floor
Less than 5000 sq. ft. 1500 gpm 6 hrs. 300 ft.
10,000 or more sq. ft. 2000 gpm 8 hrs. 300
15,000 or more sq. ft. 3000 gpm 10 hrs. 300
20,000 or more sq. ft. 3500 gpm 10 hrs. 300
C. MULTIPLE RESIDENTIAL THREE STORY AND HIGHER
Building size in square feet on first floor
Less than 10,000 sq. ft. 2000 gpm 8 hrs. 300 ft.
10,000 or more sq. ft. 2500 gpm 10 hrs. 300
15,000 or more sq. ft. 3000 gpm 10 hrs. 300
20,000 or more sq. ft. 3500 gpm 10 hrs. 300
25,000 or more sq. ft. 4000 gpm 10 hrs. 300
30,000 or more sq. ft. 4500 gpm 10 hrs. 300
35,000 or more sq. ft. 5000 gpm 10 hrs. 300
D. COMMERCIAL OR INDUSTRIAL
Building Size in square feet on first floor
Less than 10,000 sq. ft. 2000 gpm 8 hrs. 300 ft.
10,000 or more sq. ft. 2500 gpm 10 hrs. 300
15,000 or more sq. ft. 3000 gpm 10 hrs. 300
20,000 or more sq. ft. 3500 gpm 10 hrs. 300
25,000 or more sq. ft. 4000 gpm 10 hrs. 300
30,000 or more sq. ft. 4500 gpm 10 hrs. 300
35,000 or more sq. ft. 5000 gpm 10 hrs. 300

Text read from an image; its layout may differ:
Fire Flow Duration
Building Classification Requirements Requirements Fire Hydrant Spacing
E. MOBILE HOME PARKS
Recreation Bldg. 1500 gpm+ 6 hrs. 330 ft.
Trailer Space Area 500-1000 gpm 4 hrs 660-1000 ft.
F. SCHOOLS
Elementary 2000 gpm 8 hrs. 330 ft.
Junior High 2500 gpm 10 hrs. 330
Senior High 3000 gpm 10 hrs. 330
G. SPECIAL PROVISIONS APPLICABLE TO THE FOREGOING:
1. In classifications (a), (b), (c) and (d) required fire flow should be based on the highest land use allowed
under the Zoning Ordinance.
2. In classification (b) 500 gallons per minute should be added for each additional floor level, in addition to
the first floor, to a total required fire flow not to exceed 3500 gpm.
3. In classifications (c) and (d) 500 gpm should be added for each additional floor level, in addition to the
first floor, to a total required fire flow not to exceed 500 gpm.
4. In classification (d) 5000 gpm should be required for industrial and/or commercial subdivisions where
zoning allows the construction of buildings and justifies such a flow.
5. In classifications (b), (c), and (d) where buildings are constructed of fire resisting material, such as concrete
and brick, or are provided with automatic fire sprinkler systems, required fire flow may be reduced. All such
reduction should be predicated on recognized standards and recommendations of the Public Fire Protection
Grading and Rating Agencies providing that service.
6. In all classifications all required fire flows are to be available at 20 pounds per square inch residual
pressure.

The distribution system shall be of adequate size and so designed in conjunction with related facilities to maintain normal operating pressures of not less than 35 p.s.i.g. nor more than 125 p.s.i.g., at the water main in streets or highways in use, except that during periods of hourly maximum demand the pressure shall not be less than 30 p.s.i.g. and that during periods of hourly minimum demand the pressure may not be more than 150 p.s.i.g. The pressure may be greater if the customer is so notified.

All water systems shall be designed to permit circulating water flows except where impractical because of cul-de-sac and like conditions or the incomplete development of the grid system.

All water pipe and fittings used in distribution mains shall be designed to withstand the maximum internal and external forces to which it may be subjected under normal operating conditions with an ample safety factor.

The minimum size for use in the distribution system shall be nominal six (6) inch diameter on which fire hydrants are located except where a smaller size will deliver the flow requirements of Section 7451.1 and except where total flow requirements on cul-de-sacs and similar cases are satisfied.

In no case shall the diameter of the water service connection be less than the service pipe required by the Plumbing Code for the building to be served thereby. The service pipe shall be equipped with a valve at the inlet to the meter or at the property line if unmetered.

All main line valves on distribution mains shall be installed at not less than a 3 valve pattern at street intersections having single intersecting mains.

The size and type of fire hydrants shall be designated by the Fire Chief and the location shall be approved by the Fire Chief and by the Superintendent of Streets.

The waterway from street main to hydrant riser shall be not smaller than the street main up to a nominal size inch diameter and shall be gated.

The transmission pipelines from sources of supply shall be designed to deliver in combination with related storage facilities and to the limits of the capacity of those sources of supply the maximum requirements of that portion of the system which is dependent upon such transmission pipelines. These lines may be gravity lines from source facility to terminal storage, in which case they cannot be used to deliver water to customers. Otherwise the lines shall be designed under the same qualifications as any line in the distribution system.

Pumping equipment delivering water to the distribution system shall, in conjunction with the storage facilities, be so designed as to meet the requirements of Section 7451.1. Each pumping unit shall be driven by a separate power unit of adequate size. A master meter or other suitable measuring device shall be provided for each source facility to register accurately the quantity of water delivered to the distribution system.

All property containing source or storage facilities shall be adequately fenced, or otherwise protected, to prevent unauthorized entry.

All electrical control equipment shall be so designed that there will be adequate protection of all motors and other electrical equipment.

Storage capacity shall be so designed in conjunction with source facilities as to meet the flow requirements of Section 7451.1 and 7451.4.

The construction of the water utility shall conform to standard acceptable engineering practices.

If the engineer finds that, in order to comply with the provisions of this Division, it is necessary to conform to certain standards of materials and construction, or both, he shall promulgate such standards and publish the same in a Utility Manual. The Engineer shall file this Utility Manual and all amendments thereto with the City Clerk. All construction and materials shall conform to the Utility Manual described in this Section.

All materials, pipes, valves, fittings, and other appliances shall be of such strength and durability as to be free of structural hazards.

Metallic and non-metallic materials may be used separately and in combination to construct component parts of a water system including but not limited to, conduits, pipes, couplings, caulking materials, protective linings and coatings, services, valves, hydrants, pumps, tanks and reservoirs.

The material shall have a reasonable useful service life and be capable of withstanding with ample safety factors the internal and external forces to which it may be subjected in service. The materials and equipment shall be so selected as to mitigate corrosion, electrolysis, and deterioration.

This Division does not prohibit the use of newly developed materials or equipment if such materials and equipment meet the requirements of this Ordinance and the Utility Manual described in this part.

All work shall be performed by competent workmen experienced in the trade involved. Such work shall be done in a manner to avoid imperfections which might impair the stability of the physical structure. All work and equipment shall comply with applicable codes. Installation shall be made by or under the direction of qualified personnel.

All water mains located in the public right-of-way shall be located as specified by the City at time of obtaining the excavation permit.

Adequate foundation considering soil conditions shall be provided to prevent vibration of any rotating equipment.

All piping shall be installed to provide free flow of water and prevent turbulence.

Pump installations shall be such as to provide cutting the unit out of service for overhaul and maintenance and piping shall have flexible couplings to prevent strain on pump cases in case of settlement of foundation or piping.

Housing for all equipment appurtenances, and other facilities shall provide adequate ventilation and protection against unauthorized entry, ample space for the performance of all operating, maintenance and repair functions.

Construction shall be such as to prevent sanitary hazard or structural defects whether the pumping unit is handling raw or treated water.

Adequate foundation considering soil conditions shall be provided.

All steel tanks shall be provided with adequate protective coatings.

Adequate ventilation shall be provided in all storage reservoirs or tanks.