O-1985-1452 - Laserfiche WebLink

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e e -12- (3) Base flood elevation data shall be generated for subdivision proposals, and other proposed develop:nent which is greater than 50 lots or 5 acres, whichever is lesser, if not otherwise provided pursuant to Article 3, Section E, or Article 4, Section B (7) of this Ordinance. (4) All develop:nent proposals shall have adequate drainage provided to reduce exposure to flood hazard. (5) All develop:nent proposals shall have public utilities and facilities such as sew:!r, gas, electrical and water systems located and con- structed to minimize flood damage. SECTION D. STANDARI:S FOR AREAS OF SHALLOW FLOODING (AD/AH ZONES) Located within the areas of special flood hazard established in Article 3, Section B, are areas designated as shallow flooding. 'fuese areas have special flood hazards associated with base flood depths of 1 to 3 feet where a clearly defined channel does not exist and where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow; therefore, the following provisions apply: (1) All new construction and substantial improvemants of residential struc- tures have the lowest floor (including basemant) elevated above the highest adjacent grade at least as high as the depth number specified in feet on tb3 ccmnunity's FIRM (at least two feet if no depth number is specified). (2) All new construction and substantial improvemants of non-residential structures: ( i) Have the lo~st floor (including basemant) elevated above the highest adjacent grade at least as high as the depth number specified in feet on the canmunity's FIRM (at least two feet if no depth number is specified), or; (ii) Tbgether with attendant utility and sanitary facilities be designated so that below the base flood level the structure is watertight with walls substantially ~rmeable to the passage of water with structural canponents having the capability of resisting hydrostatic and hydrodynamic loads or effects of buoyancy. (3) A registered professional engineer or architect shall sutmit a certifi- cation to the Flood Plain Administrator that the standards of this Section, as proposed in Article 4, Section C (1) a., are satisfied. (4) Require within Zones AH and NJ, adequate drainage paths around struc- tures on slopes, to guide floodwaters around and away fran proposed structures. SECTION E. FLOOIMAYS Floodways-located within areas of special flood hazard established in Article 3, Section B, are areas designated as floodways. Since tb3 floodway is an extremaly hazardous area due to the velocity of flood waters which carry debris, potential projectiles and erosion potential, the following provisions shall apply: (1) Encroachments are prohibited, including fill, new construction, sub- stantial improvenents and other develop:nent unless certifications by a registered professional engineer or architect lS provided demonstrating