2020/06/10 Council Agenda Packet

a) Appurtenant structures used solely for parking of vehicles or limited storage may be constructed such that the floor is below the BFE,provided the structure is designed and constructed in accordance with the following requirements: i. Use of the appurtenant structure must be limited to parking of vehicles or limited storage; ii. The portions of the appurtenant structure located below the BFE must be built using flood resistant materials; iii. The appurtenant structure must be adequately anchored to prevent flotation,collapse,and lateral movement; iv. Any machinery or equipment servicing the appurtenant structure must be elevated or floodproofed to or above the BFE; v. The appurtenant structure must comply with floodway encroachment provisions in Section 19.30.090.D.1(no rise standard); vi. The appurtenant structure must be designed to allow for the automatic entry and exit of flood waters in accordance with Section 19.30.090.B.1.e. vii. The structure shall have low damage potential, viii. If the structure is converted to another use,it must be brought into full compliance with the standards governing such use,and ix. The structure shall not be used for human habitation. 7. Detached garages,storage structures,and other appurtenant structures not meeting the above standards must be constructed in accordance with all applicable standards in Section 19.30.090.B.1. 8. Upon completion of the structure,certification that the requirements of this section have been satisfied shall be provided to the Floodplain Administrator for verification. C. AE and A1-30 Zones with Base Flood Elevations but No Floodways. In areas with BFEs(but a regulatory floodway has not been designated),no new construction,substantial improvements,or other development(including fill)shall be permitted within zones A1-30 and AE on the community's FIRM,unless it is demonstrated that the cumulative effect of the proposed development,when combined with all other existing and anticipated development,will not increase the water surface elevation of the base flood more than one foot at any point within the community. D. Floodways. Located within areas of special flood hazard established in Section 19.30.030 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters that can carry debris,and increase erosion potential,the following provisions apply: 1. No Rise Standard. Prohibit encroachments,including fill,new construction,substantial improvements, and other development,unless certification by a registered professional engineer is provided demonstrating through hydrologic and hydraulic analyses performed in accordance with standard engineering practice-that the proposed encroachment would not result in any increase in flood levels during the occurrence of the base flood discharge. 2. Residential Construction in Floodways.Construction or reconstruction of residential structures is prohibited within designated floodways,except for repairs, reconstruction,or improvements to a structure that do not increase the ground floor area;and repairs,reconstruction,or improvements to a structure,the cost of which does not exceed 50 percent of the market value of the structure either, before the repair or reconstruction is started,or if the structure has been damaged,and is being restored, before the damage occurred.Any project for improvement of a structure to correct existing violations of state or local health,sanitary,or safety code specifications that have been identified by the local code enforcement official and that are the minimum necessary to assure safe living conditions,or to structures identified as historic places, may be excluded in the 50 percent. 3. Substantially Damaged Residences in Floodway. 15 121