The following uses shall be permitted in a combining FW district only upon issuance of a conditional use permit and a determination that the provisions of Section 17.30.040 can be met:

    A.    Any structure (temporary or permanent) except those specified in Section 17.30.030A;

    B.    Storage of materials or equipment;

    C.    Obstruction; or

    D.    Any other use which adversely affects the capacity of the channels or floodways of the main stream or tributary thereof; drainage ditch; or any other drainage facility or system. (Prior gen. code § 8-44.5)