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DRAFT 927.07 STREETS UTILITIES AND PUBLIC SERVICES CODE 66N (h) The minimum storage volume for the stormwater retention system shall be calculated following the requirements of subsections (a) through (g) above. However, in no case shall the required storage volume be less than the total proposed hardsurface area of the site times two inches. Hard surface areas shall include roof areas, concrete areas, asphalt areas, brick areas, stone paver areas, and other similar areas as determined by the City Engineer. (i) The requirements shall be satisfied at each location where runoff leaves the development area. The runoff rates and volumes shall be considered for both the conditions before development and after development at each of these locations. (j) To ensure the continued functioning of stormwater control structures, the following information shall be identified to the satisfaction of the City Engineer. (1) The person or entity responsible for continued maintenance of the stormwater control structure and the mechanism establishing responsibility; (2)Maintenance requirements and Schedules; and (3)Permanent access and access easements required to perform inspection and maintenance of stormwater control structures and stormwater conveyance systems if easements are required by City. The minimum size of an easement shall be approved by the City Engineer. (k) Methods for controlling increases in stormwater runoff peaks and volumes shall be proposed that may include but are not limited to: (1) Retarding flow velocities by increasing friction; for example, grassed road ditches rather than paved street gutters where practical, low density development areas, access roads, etc.; or grass- and rock-lined drainage channels; (2) Grading and construction of terraces and diversions to slow runoff and use of grade control structures to provide a level of control in flow paths and stream gradients; (3) Induced infiltration of increased stormwater runoff into the soil where practical; for example, constructing special infiltration areas where soils are suitable; retaimng topsoil for all areas to be revegetated; or providing good infiltration areas with proper emergency overflow facilities; and (4) Provisions for detention and retention; for example, permanent ponds and lakes with stormwater basins provided with proper drainage, multiple use areas for stormwater detention and recreation, wildlife, transportation, fire protection, aesthetics or subsurface storage areas. Any and all such method or methods proposed for controlling increases in stormwater runoff peaks and volumes shall first be submitted to the City Engineer for his review and comment, and may be implemented by the property owner only if first determined by the City Engineer to be reasonable and appropriate, and approved by the City Engineer. (Ord. 2003-86. Passed 5-18-04.) 927.07 STORMWATER STORAGE STANDARDS. Stormwater storage facilities shall be either underground storage facilities, dry or wet ponds or a combination thereof as approved by the City Engineer. Wet ponds (ponds that are designed to retain stormwater to a certain depth) shall be enclosed by a fence in accordance with Chapter 1345.