underline-strikeout version of the final draft ordinance - Pima County ...

For May 4, 2010 BOS HearingTHIS THE CLERK OF THE BOARD FORMAT!!!equitably to all property in proportion to flood waters generated by urban use of the property.The fees will also be restricted to providing flood control improvements necessary for theallowed use of the properties owned by the person or entity from which the fee is collected, andthe fees shall be reasonably related to the actual cost of providing flood control improvementsbeneficial to the site or surrounding area. The fees will be reviewed by the Flood Control DistrictAdvisory Committee, prior to action by the Board. (Ord. 2005 FC-2 § 2 (part), 2005; Ord. 1999FC-1 § 1 (part), 1999; Ord. 1988 FC-2 Art. 11 (H), 1988)16.36.120Drainage Channels.Channel design standards for constructed drainage channels and other flood control structuresshall be established by the Chief Engineer. The requirements as specified in this title areminimum standards and address general floodplain management requirements. Specific projectsmay warrant additional requirements that may be imposed by the Chief Engineer. In unusualconditions and on a case-by-case basis, permitting and construction of perimeter channels, floodwalls, levees or unlined constructed channels may be allowed with approval of the engineeringand construction specifications by the Chief Engineer.A. Drainage channels shall be designed to provide containment of the regulatory flood and tominimize erosion, but shall not be fully lined so that the improved channel bottoms shall remainnatural.B. Perimeter channels that route flow around the outer edge of the development should beareprohibited in all areas where there is an established natural channel. Where used, perimeterchannels shall be adequately armored against erosion from flow intercepted by the channel, aswell as from flow within the channel.C. Flood walls or levees for flood proofing shall only be allowed under special circumstanceswith approval of the Chief Engineer within a FEMA designated floodplain, and shall be designedto meet FEMA's levee design requirements when located within a regulatory floodplain. Whereapproved for use, the levee or flood wall shall be constructed withincluding a minimum of 3 feetof freeboard above the base flood elevation. Adjacent finished floor elevations shall be 1 footabove the base flood elevation until the levee construction has been approved by the District, anda LOMR has been issued by FEMA, if necessary.D. For regulatory flows greater than 500 cfs, the construction of earthen, unlined channels shallrequire written approval by the Chief Engineer as well as an engineering analysis prepared andsealed by an Arizona registered civil engineer. (Ord. 2010 FC-1; Ord. 2005 FC-2 § 2 (part),2005; Ord. 1999 FC-1 § 1 (part), 1999; Ord. 1998 FC-1 Section 5, 1998)16.36.130Maintenance access to drainage improvements.Any and all drainage improvements shall be designed with adequate access to the drainageimprovements to allow for maintenance of the intended design conveyance and/or storagecapacity, maintenance of erosion control, and maintenance of flood control function. Suchdrainage improvements may include, but are not limited to, channels, culverts, storm waterdetention/retention basins, storm drains, streets, or other permanent conveyances or storagefacilities designed to meet the requirements of this title. (Ord. 2005 FC-2 § 2 (part), 2005)16.36.14062