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riprap or other protection from erosio~, so the ~lood protec~ion structures themselves survive any floo~. 2.4 Flood Damages A preliminary count indicates between 80% and 90% o~ the town's structures woulCl be flooded to varying degrees. At present the problem would beein with water breaking out just east of Dolores, crossing over Highway 145 and spreading out through town. About 75% of the 100-year floodplain in town would experience flooding depths of 0 to 2 feet. Approximately 20% would experience flooding de6.ths between 2 to 4 feet. - , About 5% would experience flooding depths over 4 feet. Plate 3 shows the relatio~sh~p between depth of :~looding and the percent damage ~o a structure. Th~ cha~t :,hows that slight damage due t.o seepage can be expect.ed even :~n those buildings with their lowest floor sornew~ere between o and 1 foot above the 100-year flood elevations. These percentages of damage for each building can be combined wi t.h an assumed (or more accurately determined) dollar value for each building to calculate damages during a 100-year flood. By determining which buildings a:~e in the 50-yea:, floodplain, the 25-year floodplain, and the 10-year floodplain, and by using tte same technique as for the 100-year floodplain, a curve showing estimated dollar damace \'ersus the probability of flooding in a~y given :!ea~ can be c:onstructed. The area unde~ ~hat curve represen':s 2ve~age cmnual damages. Over S 1 00,000 in avera'?e annual 6amages .'a,s €~stimated for Dolores. Additional damages of ma:\o~ s;i~nificance could be expec~ed a~ ~he Water ~~eatme~t F'acility. ~he ?on6s on the site wo~:5 be 6es~~o~7e~ anc t~~ tluildings would experience substantial damage. Other carnages, such as trans~)ortat:i.on cisrup':ions, closure of businesses, landscaping damage, Clean\lp costs infiltration into utilities, etc., were not aCCOllnte6 for ~~ 6etail. Given the wide extent of the floodplain, those types of damages can be expected to be significant. -6-