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<br />) <br /> <br />J <br /> <br />) <br /> <br />protection facilities, parks, recreational facilities, etc. Specific <br />inspection and appraisal of damage potentials is required in each case. <br />Physical damages to public property can be readily evaluated by the <br />restoration method of appraisal. Estimates of such damages and the costs <br /> <br />of related emergency and normal services should be prepared in cooperation <br /> <br /> <br />with the governmental or other agency involved. The highly variable <br /> <br /> <br />nature of other public facilities makes use of a standard form generally <br /> <br /> <br />impracticable, and notes thereon and appraisal computations should be <br /> <br />adapted to each case. It may be found that many public facilities or <br /> <br />services overlap several flood reaches or zones and that damages cannot <br /> <br />readily be assigned to specific locations. <br /> <br />Thus, breaks at anyone or several points in water supply or sewerage <br /> <br />systems may produce equivalent associated losses to customers or taxpayers <br /> <br /> <br />in other reaches or on high ground. Damage to pUbli: property such as <br /> <br /> <br />streets, sidewalks, lighting, water and sewer connections, etc., may <br /> <br /> <br />duplicate part of the appraisal of specific properties served. <br /> <br />DEPTH-DAMAGE FUNCTION CALCUlATION <br />Depth damage functions can be calculated to various degrees of <br /> <br />precision. The simplest method is merely to take the mean value of <br /> <br /> <br />percent damage for each water height. The problems with this procedure <br /> <br /> <br />include: the limitation of variation in percent damage to one variable: <br /> <br /> <br />water height; there is limited information provided on the effect of <br />outliers or extreme values of percent damage on the sample mean; there is <br /> <br /> <br />no level of dispersion determined for the data; and, there is no parameter <br /> <br /> <br />to show the strength of the independent variable, water height, in <br /> <br />V-45 <br />