§ 21.10. Preventing Increased Damages

No development in the SFHA shall create a damaging or potentially damaging increase in flood heights or velocity or threat to public health and safety.

(a)

Within the floodway identified on the flood boundary and floodway map or the flood insurance rate map, the following standards shall apply:

(1)

No structures intended for occupancy shall be constructed within the 100-year floodway limits.

(2)

No development shall be allowed which acting alone or in combination with other development, shall cause any increase in the elevation of the regulatory flood; and

(3)

For all projects involving channel modifications or fill, including levees, the county or city shall submit a request to the FEMA to revise the regulatory flood data.

(b)

Within all SFHAs identified as A zones, where no 100-year flood elevation and/or floodway/floodway fringe delineation has been provided, the total cumulative effect of the proposed development activity, when combined with all other existing and anticipated development, shall not increase the regulatory flood elevation and will not increase flood damages or potential flood damages.

(c)

All effects on the backwater surface profile shall be modeled ad submitted for review for any construction and/or grading activity. Backwater effects shall be minimized and shall not exceed current State and Federal standards. In for case shall backwater effects exceed 0.10 foot of water surface profile increase.

(d)

Any fill deposited in the floodplain or floodway as part of the development project shall be compensated for with creation of additional floodwater storage, at a volumetric ratio of 1:1. See 21.11 (k).

(e)

Public health standards in all SFHAs.

(1)

The location or storage of chemicals, explosives, buoyant materials, flammable liquids, pollutants, or other hazardous or toxic materials below the flood protection grade (FPG) shall not be permitted.

(2)

New and replacement sanitary sewer lines may be permitted providing all manholes or other aboveground openings are elevated above the FPG.