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In order to ensure the provision of adequate utilities as determined by the public works director or designee in a timely manner consistent with the city’s comprehensive plan, and protect the health, safety, and welfare of the city and its residents, all activities regulated under this title shall comply with the following requirements:

A. Drainage Facilities. In order to appropriately manage increased storm water runoff resulting from division and subsequent development of a tract in such a manner as to minimize erosion, reduce potential for on-site and off-site flooding, and control public costs for the provision of storm water management facilities, all storm water management facilities shall be designed and constructed to reflect the general principles and design criteria set forth in this section.

General principles of storm water management design to be reflected in any subdivision layout include: retention; incorporation and use of any natural drainage features or infiltration; and provision of storm water detention/retention facilities to control peak flows during a storm event.

The proposed storm water management system shall conform to the general design criteria set forth in the Stormwater Manual and the Public Works Standards.

1. No subdivision shall be approved which does not make adequate provision for storm or flood water runoff;

2. All storm water systems shall be separate and independent from sanitary sewer systems;

3. Preference for storm water systems is given to infiltration, retention and use of natural drainage systems whenever possible;

4. Storm water systems shall be designed to maintain historical flows necessary for the preservation of wetlands, ponds, streams or other critical areas. Separate infrastructure may be approved for use in collecting and discharging roof runoff and spring/seep water to critical areas to assist in maintaining historical flows. Road or yard runoff discharged to critical areas shall apply appropriate pretreatment per Chapter 13.46;

5. Adequate biofiltration facilities designed per Chapter 13.46 shall be provided to reduce siltation and water quality impacts;

6. All storm water facilities shall be located either in a public road right-of-way, or in a separate dedicated tract of appropriate width and improved to the standards set forth in Chapter 13.46 and the Public Works Standards;

7. Retention and use of natural drainage systems is encouraged whenever possible. Said drainage ways shall be established and delineated by easement of adequate width which conforms substantially to the lines of the watercourse, and shall be maintained in an open vegetated channel; and

8. Subdivision of any portion of any tract located within an area subject to flooding as delineated on the most recent edition of the Federal Emergency Management Agency’s flood insurance rate maps shall comply with associated floodproof development standards.

B. Domestic Water Facilities. In order to assure the establishment of a water supply system capable of providing a safe and adequate supply of water for domestic use and fire protection at all times, a public water system shall be extended, sized, designed and constructed in such a manner as to provide adequate domestic water service to every lot and provide minimum required fire flows.

General principles of domestic water system design to be reflected in any subdivision layout include: establishment of a system which provides adequate pressure and flow to meet domestic water, fire flow and irrigation demand; and design and construction of a system which ensures a safe and sanitary source of domestic water.

The proposed domestic water system shall conform to the general design criteria set forth below and specific development standards referenced in the Public Works Standards:

1. The water mains shall be designed and constructed in a “looped” system wherever possible in order to reduce potential for stagnation and stabilized system pressure;

2. Fire hydrants shall be located, sized and installed in accordance with the standards and specifications set forth in the Public Works Standards and approved by the fire chief or designee of the Valley Regional Fire Authority; and

3. Water mains and fire hydrants shall be located within a public street right-of-way, or within a perpetual easement of appropriate width and improved to the standards set forth in the most recent Public Works Standards. Placement within a public street right-of-way is preferred.

C. Sanitary Sewer Facilities. In order to assure protection of the local groundwater aquifer, sources of supply for the city’s domestic water system, and surface water systems, and reduce the potential for sewage-related health hazards, a sanitary sewer system shall be extended, sized, designed and constructed in such a manner so as to provide sanitary sewer service to every lot in the development.

The proposed sanitary sewer system shall conform to the general design criteria set forth below and specific development standards referenced in the Public Works Standards:

1. The system shall be designed to be a gravity flow system whenever possible, to reduce ongoing operation and maintenance associated with a mechanically pumped system;

2. Sanitary sewer facilities shall be located within a public street right-of-way, or within a perpetual easement of appropriate width and improved to the standards set forth in the Public Works Standards. Placement of sewer mains within a street right-of-way is preferred, with any associated pumping facilities to be located outside of public street right-of-way and within a tract dedicated to the city; and

3. When sanitary sewer service is not available and the city public works supervisor or city planner has authorized the use of an on-site septic system, the on-site septic system shall be reviewed and approved by Seattle-King County Health.

4. Undergrounding of Utilities. The city of Algona requires underground installation of all new, or replacement of existing, overhead utilities such as telephone, single-phase power, cable TV, etc., designed to serve the subdivision and located within the boundaries of the tract. (Ord. 1111-15 § 2; Ord. 1016-08 § 2).