There is hereby adopted the following Exhibit A, Design Standards for water line construction, reconstruction or replacement which must be followed by all persons seeking to connect to the Municipal water systems: (Ord. 1987-15, 8-4-1987; amd. 2000 Code)
EXHIBIT A, Water Facilities Construction Standards prepared for the City by Molzen-Corbin & Associates.
SECTION 110
WATER SYSTEM DESIGN CRITERIA
This Section presents the criteria, standards, and regulations related to the design of water distribution systems for general development service. It does not cover the criteria necessary for design of major transmission lines, wells, pumping facilities or reservoirs. The material is directed to the competent design professional and is not intended to be a detailed design handbook. Criteria and standards presented are those determined to be the minimum acceptable values necessary to result in system designs having satisfactory functional characteristics, durability, and operational suitability. It is expected that the designer will strive for the best design to suit the circumstances involved, and that designs will reflect sound professional judgment at all times.
110.1 Governing Regulations
Ordinances and policies related to the design and operation of domestic water systems include the following:
1. Subdivision Ordinance
2. Water and Sewer Rates
110.2 Water System Design Criteria
110.2.1 General Requirements
110.2.1.1 In calculating line sizes for main loop lines, the future development of the surrounding area will be considered and addressed in the report.
110.2.1.2 Domestic water design shall conform in size, location, and arrangement to adopted plans. Governing plans may include, but are not limited to, the approved area plan and City master plans. The City should be consulted for information regarding applicable plans for areas under design consideration.
110.2.1.3 Pressure zone boundaries must be considered in the design of all systems.
110.2.1.4 Location of lines must be according to Primary Utility locations in Exhibit 110-1. Deviations will require approval of the City.
110.2.2 Sizing requirements in single-family and duplex developments are as follows:
a. 6 inches minimum.
b. An 8-inch line is required if loop lines are not provided at a maximum interval of 1,200 feet.
c. Minimum 6-inch line to any fire hydrant.
d. Fire protection may require larger sizing.
e. Design flow rates for subdivision line sizing are as follows:
Average Maximum | ||
Daily | Hourly | |
(1) Single-family dwellings | 425 gpd | 1.8 gpm 1/2 acre and less |
Greater than 1/2 acre | 425 gpd | 3.3 gpm |
(2) Fire flow - See Section 110.6.1.6
(3) Commercial - Commercial water flow rates are highly variable. They will be considered on an individual basis by the designer in his report.
110.2.3 Sizing requirements for industrial/commercial and multi-family developments are as follows:
a. Typical 8 inches minimum.
b. Fire protection may require larger sizing. Determination is made by the City.
110.3 Alignment/Proximity To Other Utilities
110.3.1 The main lines are to be located within public right of way except as noted below, and aligned in accordance with the Primary Utility locations of Exhibit 110-1. Water lines must be located so they can be maintained without disturbing any sidewalk, curb, gutter or any other utility. For lines within streets, the construction trench is required to be contained totally within the paved roadway.
110.3.2 If circumstances require location of water lines in other than the location established by the Primary Utility locations, written approval of the City and the utilities normally expected to occupy the revised location must be obtained. Main lines may be located outside public right of way only with prior written approval of the City and only within appropriate easements.
110.3.3 If not in public right of way, the distribution line must be located as follows:
a. In a paved, permanent access easement, including an easement for the water line, or
b. In a planned green space with access suitable for maintenance equipment and within an appropriate easement.
c. If 1 or 2 above is impossible because of prior platting, the location will be handled as a special case.
d. A permanent easement must be granted for the exclusive use of water and sanitary sewer. A minimum width easement of 20 feet is required for a single utility and 25 feet for water and sewer, both within the same easement.
e. In private streets, Primary Utility locations apply where possible.
110.4 Valvinq (See Standard Detail S200-110.41W)
110.4.1 Valve Placement.
110.4.1.1 Spacing shall be 1,200 feet maximum between in-line valves for lines 14 inches or smaller.
110.4.1.2 At the intersection of water lines, all but one line must be valved.
110.4.1.3 Fire hydrant legs must be valved on lines 10 inches in diameter and larger.
110.4.1.4 The system valving must be arranged so that lines may be shut down with a minimum number of valves and affecting the minimum service area. Valving of the ultimate system looping must be such that no break will disrupt service beyond the next valve location. System valving design should assure that only the immediate area where the break occurs will suffer disruption of water supply.
110.4.1.5 Valve Location. Valves shall be located as shown on the improvement plans. Valves for pressure connections of branches to existing water lines will necessarily be adjacent to the existing line.
110.4.1.6 Valve Types. Valves shall be AWWA C500 NRS gate valves.
110.4.1.7 Valve Sizing. Valving must be line sized. Special tapping valves shall be used with tapping sleeves.
110.4.1.8 Air Relief Valves (Standard Detail S200-110.418W). Air relief valves will be provided as determined by the designer and approved by the City.
110.4.1.9 Pressure Reducing Stations. The City determines the need for pressure reducing stations, their location, and the need for reduction of valve sizing. Station design will generally be in conformance with Standard Details S200-110.419W-A & B. The developer must provide any pressure reducing stations required for his subdivision.
Service Lines and Meters
The metered service line is public through the tailpiece installed on the private side of the meter. Normally, the tailpiece extends to the right-of-way line in accordance with Standard Detail S200-110.51W.
110.5.2 Sizing of the service line and meter is the responsibility of the requesting party. The City will, upon request, provide information relative to the flow characteristics of the various available metered sizes. However, single-family dwelling units will generally utilize a 5/8" x 3/4" meter.
110.5.3 The public portion of the service line including the setter and box may be installed by either of two methods:
110.5.3.1 The City will make the installations subsequent to formal application and payment of all appropriate charges. If so desired, and appropriate, the City will also install the meter at this time.
110.5.3.2 An approved contractor may install the service line and/or meter box as part of the subdivision development. This method requires an approved set of construction plans showing service line and/or meter box installation. The water mains and service lines must be completed, including flushing and disinfection, and accepted formally in writing before the City will install meters. In addition, unless special agreements for phasing have been made, the entire subdivision has to be formally accepted in writing by the City before the City will install a meter. Upon completion and acceptance of the project, the City will install the meter subsequent to formal application and payment of all appropriate charges.
110.5.4 Typically meters 2 inches and smaller are located within the public right of way behind the street curb.
110.5.5 Meters 3 inches and larger require a permanent easement on the landowner's property.
110.5.6 Meters for any installation may only be installed by the City subsequent to formal application and payment of all appropriate charges.
110.5.7 All dwelling units must be individually metered.
110.6 Fire Hydrant Protection
110.6.1 General Information
110.6.1.1 Sunland Park Fire Department experience, National Fire Codes, Fire Insurance regulations and Water Works practices provide the hydrant criteria which is used to determine required protection.
110.6.1.2 Sunland Park's fire prevention policies are required to:
a. Attain adequate fire protection of life and property.
b. Achieve orderly development of the fire hydrant protection system.
c. Set forth guidelines and rules for development of a fire hydrant system.
110.6.1.3 Fire hydrants are generally installed on mains when water lines are extended according to spacing criteria that varies according to proposed land use adjacent to the water line. These hydrants may have to be supplemented with additional hydrants when actual development takes place. Cases also exist where water lines have been extended through undeveloped areas or unplatted land, and hydrants were not installed at the time of water line extension. Necessary hydrants must be installed at the time of adjacent development.
110.6.1.4 Fire hydrants are located within public right of way where possible. The type, layout, and size of development may dictate location of fire hydrants on private property.
110.6.1.5 Each development must be analyzed for fire hydrant needs. Fire hydrant requirements vary with the size and layout of the buildings, building design and construction materials, and access from the proximity to the public right of way.
110.6.1.6 All required fire hydrants in residential development shall provide proper fire flow (minimum of 750 gpm at minimum 20 psi residual pressure from the 4-inch outlet). Water system design shall provide minimum fire flow in residential areas of 750 gpm with minimum 20 psi residual each from any two adjacent fire hydrants in the development (total fire flow of 1,500 gpm with minimum 20 psi residual). High density residential developments (8 units per acre or more), commercial developments, apartment developments, and industrial developments will require special studies to determine fire flow requirements.
110.6.1.7 Hydrants shall be installed in accordance with the City's standards and policies and Standard Detail S200-110.617W and shall be available for use prior to the beginning of development building construction.
110.6.2 General Fire Hydrant Location Requirements for Fire Protection.
110.6.2.1 Definitions:
RESIDENTIAL: Single-family and two-family dwellings, duplexes, triplexes, and mobile homes.
LIGHT USE COMMERCIAL: Light industrial and shopping centers under 18,000 square feet, and apartments over 4 units (includes townhouses).
HEAVY USE COMMERCIAL: Large industrial complexes, major shopping centers, and apartment complexes over 18,000 square feet.
110.6.2.2 Hydrant Spacing Requirements.
a. Development Areas (Street Measurement, Bonnet to Bonnet
Residential 500 feet maximum between hydrants
Light Commercial 500 feet maximum between hydrants Heavy Commercial 300 feet maximum between hydrants
In residential areas and mobile home parks, there shall be one hydrant at each street intersection with intermediate hydrants so that no one home is more than 275 feet from a hydrant.
b. New and Existing Individual Buildings in Sparsely Developed Areas
Distance is measured as the fire equipment travels from the fire hydrant to the structure. All distances given are maximum.
Residential 275 feet
Light Commercial 300 feet to the farthest portion of the building
Heavy Commercial 300 feet to the farthest portion of the building
110.6.3 Hydrants shall be installed at the developer's expense including:
a. Extension of City-owned water lines in accordance with City policies.
b. Addition of fire hydrants to existing water lines.
c. Private fire lines.
d. All costs of incidental items (e.g., removal and replacement of existing improvements).
110.7 Materials
110.7.1 All construction shall conform to the Standard Details and the
110.7.2 Subdivision Regulations unless otherwise approved by the City
All construction shall conform to the New Mexico Standard Specifications for Public Works Construction, as modified herein, unless otherwise approved by the City.
110.7.3 Pipe (push on type only).
a. Polyvinylchloride (PVC) per AWWA C-900.
b. Ductile Iron Pipe (DIP).
c. Cast Iron Pipe (CIP).
110.7.4 Valves and Valve Boxes and Fire Hydrant.
a. Valves shall be installed as per Standard Detail S200-110.41W.
b. Gate Valve - per AWWA C500 for buried service, nonrising stem double disc, bronze trim.
c. Valve Box - traffic type, cast iron, per Standard Details.
d. Fire Hydrants - per AWWA C502 traffic type, 51/4-inch main valve size, 2 - 21/2-inch and 1 - 41/2-inch nozzles with National Standard fire hose threads and nozzle caps. Chrome yellow. Mueller Centurion fire hydrants shall be used exclusively in the City of Sunland Park.
110.7.5 Miscellaneous Appurtenances.
a. Water Line Fittings - cast or ductile iron.
Concrete Blocking - See Standard Detail S200-110.75W.
b. Control Valves - pressure reducing, pressure sustaining, air and vacuum release, etc. Shall be Clayton, Golden Anderson Industries or Engineer approved equivalent.
110.8 Installation Methods
1. Trenching and backfilling per standard specifications or pipe manufacturer's recommendation or Standard Details S200-109.323SS.
2. Compaction Testing - one test every 500 feet minimum. Backfill in road will require compaction tests every 200 feet.
110.9 Testing and Disinfection of Water Lines
1. Testing - Pressure test and leakage test per AWWA C600.
2. Disinfection per AWWA C601.
110.10 In the case of conflict or discrepancy between these regulations, Standard Details, and NMSSPWC, these documents will govern in the following order of priority:
1. Subdivision Regulations
2. Standard Details
3. NMSSPWC
4. Other reference specifications
(Ord. 1987-15, 8-4-1987)