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I I I I I I I I I I I I I I I I I I I The average annual project costs are presented in Table IV-4 for the "00- Nothing" and the recommended scheme. The total annual cost is comprised of esti- mated average annual damages, annual operation and maintenance cost and the annual cost of construction. The annual damage was derived by computing the area under the damage curve to find the total damage for 100 years, and then divid- ing that figure by 100 to obtain the average annual damage. The "total" figure is the sum of annual damage costs, annual 0 & M costs, and the construction cost broken down to an annual cost. This sum is an estimate of the average annual cost to the community. A comparison of the annual costs for the "Do-Nothing" and "Recommended" altematives indicates a great savings in annual cost to the community by implementing the recommended scheme. Table IV-5 presents an allocation of total project costs based on the cost attributable to the following functions: Direct Drainage Costs - includes all costs associated with modifying the channel to adequately convey the design flows. Traffic Costs - includes costs associated with modifying culverts or bridges to pass design flows, and slope protection required to prevent damage to existing streets adjoining the channel. land Acquisition - includes cost of acquiring land for channel improve- ments and flood plain zoning. Utilities - includes cost of relocating utilities. Grass and Trails - includes cost of aesthetic treatment of the project, as well as footpaths, bike and horse trails, and any other recreation features incident to the project. In some instances, money spent on one function will benefit another; an example of this is the North Valley Shopping Center culvert improvement. This improvement is allocated as a direct drainage cost, because no modification is necessary to E. 84th IV-3