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I I I I I I I I I I I I I I I I I I I Streets, and Plan I I I flood proofing together with structural modifica- tions of crossings between 17th and 55th Streets. Specifically, the master plan was to consider the following: e. Flood plain regulations would be administered to prevent an increase in flood damage potential by prohibiting development in a regulatory floodway and flood proofing all other new development to the level of the 500-year flood, as identified by the COE. (1) The primary component of COE Plan II is to excavate a floodway and to provide other structural improvements as needed to reduce flood damages to the existing development by containing the 100-year flood within the excavated floodway reaches. Other components of this plan, as recommended by the COE, include floodplain regula- tion, flood proofing to the level of the 500-year flood, flood insurance, and an early warning and emergency evacuation plan. (3) In addition to the components identified by the COE for Plan I I I, an examination was to be made of the feasibil ity of I imited struc- tural improvements at all streets, highways, railroad crossings, water diversion structures, and other locations where such improve- ments would require little or no channel ization in the reach out- side the immediate vicinity of the structures. (2) The COE Plan I I I contains the following five components: a. Relocate flood prone structures if the cost to relocate would be less than the present worth of flood damages. The COE made a prel iminary identification of such structures. Additional structures would be removed in the future if damaged excessively by flood, fire, or other natural causes. Identification was to be made in the Phase B Master Plan Report of all structures preliminarily selected by the COE for relocation and/or flood proofing along with the cost estimates developed by the COE to accomplish this work. b. Buildings that would be left in the flood plain would be flood proofed if practicable and if the cost of the flood proofing would be less than the present worth of the expected damages. The CDE has made preliminary identification of these, too. (4) Early warning planning, although not a part of this agreement, was to be incorporated into the master plan report by reference, giving a brief description of when and by whom it was developed and recommend it as a part of the total master plan for Boulder Creek. c. An early warning and evacuation plan would be establ ished. As thE.' work progressed, it became increasingly apparent t:lat a detailed analysis of debris and sedimentation was needed to adequately assess the impacts of the 100-year flood on proposed improvements. d. Flood insurance will be available to all residents. 3