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<br />. <br />0665 <br /> <br />. <br /> <br />. <br /> <br />and industrial income; loss of revenue to utilities; loss of gainful <br /> <br /> <br />employment; cost of relief and care of flood victims; cost of rerouting <br /> <br /> <br />traffic; and the losses due to general disruption of normal activities <br /> <br /> <br />within and adjacent to the flooded area. <br /> <br /> <br />53. Method of estimating average annual damages. - Average annual <br /> <br /> <br />damages were computed by means of damage-frequency curves which were con- <br /> <br /> <br />structed by correlating a discharge-frequency curve with discharge- <br /> <br /> <br />damage curves. The discharge-frequency curves were developed by methods <br /> <br /> <br />described in appendix B. The discharge-damage curves used in the deter- <br /> <br /> <br />mination of average annual damages are a composite of direct plus in- <br /> <br /> <br />direct damage to crops, other agricultural property, transportation <br /> <br /> <br />facilities, utilities, and urban property. Crop damages resulting from <br /> <br /> <br />inundation were computed by use of a discharge-cropland overflowed curve <br /> <br /> <br />. for the reach under consideration. These curves were constructed by <br /> <br /> <br />means of backwater profiles of the 1904, 1942, and standard project <br /> <br /> <br />floods. The cultivated area flooded by each of these discharges formed <br /> <br /> <br />the basis of a curve from which the number of acres of cultivated land <br /> <br /> <br />that would be inundated at any discharge could be determined.. Knowing <br /> <br /> <br />the number of cultivated acres that would be flooded at any discharge, <br /> <br /> <br />the amount of crop damage was computed using the crop damage curves <br /> <br /> <br />previously described. The percentage of land on vJhich a complete crop <br /> <br /> <br />loss would occur was estimated using data from damage surveys. Because <br /> <br /> <br />the time of year in which a flood occurs has an important bearing on the <br /> <br /> <br />amount of crop damage suffered, it Has necessary to compute a unit crop <br /> <br /> <br />damage that could be applied to any flood regardless of the time of year <br /> <br /> <br />in which it occurred. This was done by .,reighting the unit damage that <br /> <br /> <br />would be caused by floods occurring at any time of year against their <br /> <br /> <br />probability of occurril'g at that time. The discharge-damage curves for <br /> <br /> <br />property other than crops vrere developed from field surveys during which <br /> <br />20 <br /> <br />-d <br /> <br /> <br />. <br />