No structure (temporary or permanent), fill (including fill for roads and levees), deposit, obstruction, storage of materials or equipment, or other use shall be allowed as a special use which, acting alone or in combination with existing or future uses, unduly affects the capacity of the floodway or unduly increases flood heights. Consideration of the effects of a proposed use shall be based on a reasonable assumption that there will be an equal degree of encroachment extending for a significant reach on both sides of the stream. In addition, all special uses shall be subject to the requirements of Chapter 1163 and Section 1149.04.
(a) Fill.
(1) Any fill proposed to be deposited in the floodway must be shown to have some beneficial purpose and the amount thereof not greater than is necessary to achieve that purpose, as demonstrated by a plan submitted by the owner showing the uses to which the filled land will be put and the final dimensions of the proposed fill or other materials.
(2) Such fill or other materials shall be protected against erosion by rip-rap, vegetative cover or bulkheading.
(b) Structures (Temporary or Permanent) in the Floodway.
(1) Structures designed for human habitation shall not be permitted in the floodway.
(2) Structures shall have a low flood damage potential.
(3) The structure or structures, if permitted, shall be constructed and placed on the building site so as to offer the minimum obstructions to the flow of the floodwater.
A. Whenever possible, structures shall be constructed with the longitudinal axis parallel to the direction of floodflow, and
B. So far as practicable, structures shall be placed approximately on the same floodflow lines as those of adjoining structures.
(4) Structures shall be firmly anchored to prevent flotation which may result in damage to other structures, restriction of bridge openings and other narrow sections of the stream or river.
(5) Service facilities such as electrical and heating equipment shall be constructed at or above the regional flood protection elevation for the particular area or floodproofed.
(c) Storage of Materials and Equipment.
(1) The storage or processing of materials that are in time of flooding buoyant, flammable, explosive or could be injurious to human, animal, or plant life is prohibited.
(2) Storage of other material or equipment may be allowed if not subject to major damage by floods and firmly anchored to prevent flotation or readily removable from the area within the time available after a flood warning.