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<br />21 <br /> <br />This allocation formula is not particularly unique, but the <br />calculation of the Base ODF (BODF) is. In the past the BODF was <br />computed by dividing the total flood control project costs (TC) of <br />each subbasin and basin by the sum of the projected acreage for each <br />of the various land uses (LU) times its respective development factor. <br /> <br />That is: <br /> <br />n <br />BODF = TC I L (LU.) x F. <br />i=l 1 1 <br /> <br />where n = number of land use categories. <br /> <br />In keeping with the suggested dual liability concept, the writers <br /> <br />(2) <br /> <br />feel that the Base ODF should not be figured on the total project cost. <br />Rather the Base ODF should be based on the costs of the project that <br />can reasonably be assigned to new developments. The writers split the <br />total project cost into a Special Cost and a General Cost, the former <br />being used to compute Base ODF. <br />This division of costs is part of the Initial Drainage Study. One <br />should recall that during that study a viable plan is developed. One <br />of the measures of viability is the benefit cost ratio. Thus two <br />items are estimated during the Initial Drainage Study: the cost of <br />the project, and the economic benefit of the project. Cost is estimated <br /> <br />using standard construction estimating methods and does not concern use <br /> <br />here. <br /> <br />The benefit of a drainage and flood control facility is estimated <br />as the reduction in average annual damages provided by that facility. <br />These damages include direct damages such as structural and content <br /> <br />, <br /> <br />losses, and indirect damages such as maintenance and cleanup costs, and <br /> <br />loss of sales. Grigg (40) has detailed the procedure for constructing <br />