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" " ,. periods. Crop damages .~re estimated at SO percent of the crop value which includes costs for cleanup. The esti....ted flood &.m"9"8 by category and basin are given in Table 8. Average annual fLood damages are estimated by plotting the flood &....g88 ver- BUS return period. The damages for the <-ycar return period ~re assumed to be 7.Cro. figure 21 shows the damage versus frequency curves for the Eastern FlowPath,liest:ernflcwPath,<U'ldLolaParkTributary. Theaverageannl1al flood damages are $13,280 for the Eastern Flow path, $38,000 for Lob. P"rk Tributary,and$:.l,500fortheWeeternFlowPath. The damage estimate f<>:e th.. Ea8ternFIO'o'Path"B9ume..theunion~"if1"Railro"dembankn\entremain8 FLOOD DAMAGES D~gee due to flooding w@rc estimated to establish.. bassline condition for econ~ic analysis. Damages were estimated for the LOla park Tributary, the Eastern Flow path, and the Western Flow Path for existing basin condiUons. Damages .....re assessed for the 5-, 10-, 100-, and SOO-yoar return periods. Property values for each structure in the flood plain ~re obtained from the Weld County Assessor's Office. ~e Assessor's records show property values in 1973 dollars at 30 percent of market value. To estimate current market value, an annual inflation factor of seven percent was used. Average IIlObi1ehomevaluewaSaSSUlll"dtobe$17,500basedond"aleresUmates. Flood depths for each structure were calculated for each return period. Flood damage to structures and contents was estimated by applying the appropriate damage CUrve developed by the Federal Insurance Administration (reference 10). These CUrves give a percentage of total property Or content value damages versus flood depths above first floor elevations. Residential huildings were assumed to have first floor elevations one foot ahove the ground surface. Mohile homes ~re assumed to have the first floor two feet above the qroundsurface. C"""""rcialstructures""reatlsumedtohave tirst floor elevations one-half foot above the ground surface. One half of the residencos were assumed to have basements. Content value was estimated at 50 percent of total property value based on practices of the ineurance industry, Indirect da:rr.agell that ""'y result !romfloodin9 include lostbuainells and services, Loat time for enployees, clean up of debris and sediment, loss of ta~es, police and health department involvement, and inconveniences due to repair or relocation. Indirect damages were calculated by estimatinq the tlme required for cleanup based nn $10 per hour. This calculation also covers time lost from work. intact. Should the embankment fail, as in the SUmmer of 1982, an additional estimated $116,500 in damage would occur. Based on the 100-year flood event, averege annual damage on the Eastern I"low Path would increa.se $14,000 if embankment failure is considered. A detailed analysiS of flood damages ill given in the Tschnical ~ddendum. Other direct damages include repair of utilities, roads, parks. and railroad9. Theso damages were estimated individually On " time and material bash. The inundation in the eastern part of Milliken includes sOme agriCultural areas. A truck farm covers ahout two acres of the flooded area. The average annu"lcr"pvdlue was ""timatedat $1,350 per acre. Crop damages ar" varial>le dependinq upon the time of year, depth of flooding, and duration of inun~ dation. In this area, th.. flood ,lapth ie approxtmat"ly <>qual for dl return