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l' 19 Flooding within the Town 1s typically shallow, w1th depths ranging bet- ween one. and three-feet. Velocities along the major flOt<1 paths areslOt1, typically ranging from one- to three-feet per second, which attests to the mild grades throughout Haxtun. SeveralloVl intersect;c,lns prompt IOO-yed" flooding of first floors and basements adjacent to the 1011a.11n9 intersec- tions: An assessment of past flooding damages was conducted as part of this master plan. Along the major flooded areas, businesses and residences were revie>oedfordata such as value of contents, type of business, and number of employees, whether or not a basement was or had been inVOlved in past flood events. Tables 6 and 7 present the results of this assessment, which will lHer be used in the calculation of flood damage losses. Various business owners conveyed that on several occasions, property had been dalllagedbecause of shallow floodi ng caused by insufficient street drainage. ~o loss of 1 He or injury has been noted. a. Logan Avenue and Bryan Street b. North Golorado Avenue and Strohm Street c. North Colorado Avenue and Fletcher Street d. Logan Avenue and Fletcher Street F100dDarMges As discussed above, the flooding within the Town is limited to those damages associatedlo'ith shal10l0' f1ooding. Individual houses in the vicinity of Logan Avenue and Bryan Street have experienced basement flooding, and busi- ness along the alley between Washington and Colorado Avenues have had recurrent flooding problems, not necessarily associated lo'ith the IDO-year flood. This type of damage generally causes recurring cleanup by the Town, to clear mud and dehris whlch remain after the storm waters haverece ded. Ithas been estimated that the yearly maintenance costs to clear these areas of debris is approximately $10,000. The standing water also causes deterioration to the asphaltic paving, such as potholing. In the wi nter, the 1ac~ of posl- tivedrainage causes ice build UP. which can remain for long period softime. Sanding and ice removal has been included in the above cost, however, street replacement made necessary by inadequate drainage have not been included. The nlOSt serious flood damage resulting from a IOO-year storm in the areas tributary to the Town is the inund,ltion of Town's wastewater lagoons. The loss of this facility would create a potentially severe water qual1ty problem to the downstream areas, and silt and debris could be expected to enter the lagoons. No estimate of costs dssocidtedwith the loss of this facility has been made, however, the impact on water quality to downstream areas and eventually Frenchman Creek could he considerable. Durlng the coordinatio!l of the floodplain area information with t he Town and State repres<?ntative5, the threat of flooding from offsite areas WdS discussed at len~th. Flood history which points to recurrent flooding caused e. Washington Avenue and Fletcher Street f. Uncoln Avenue and Fletcher Street g. lIashington Avenue and Strohrn Street Local flooding also occurs at Joe Avenue and the railroadcrossfng, and along the channel runl'ling from Joe Avenue to Utah Avenue, adjacent to the railroad. Because of the concentration of flows on Fletcher Street, the lOO-y<?ar flow is estimated to overtop the curb, from Washington Avenue to Cooper Avenue. Several ponding areas have been identified during the course of the hydraulic analysis. These ponding areas, whiCh have no means of outlet, trap sediment, trash,andpromoteheavyweedgrowthdndinsectinfestation. These areas Include South Falrvlew Avenu-e and the rai1road. South Burlington Street and the railroad, and at Utdh Avenue and the railroad. These areas usually trap flow in even the most frequ<?nt storm events. The lOO-year floodplain on the channel draining the Town Is characterized 1:1y t1:1ree to four fnot (\<>pt1:1~, ~od low v~lociti"5. 01'11'- to thre...f,,~t r~r secol'ld. It is estimated that the lOO-year f100d would inundate the Town's scwagelagoons, because of the small Channel section, rni1eslopeandculverts which force the flow over the County Road east of the lagoons. AHEC-2water surface backwater profile has been conducted and is Included in the TeChnical Addendum to this report.