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<br />Ill. <br /> <br />FLOOD HISTORY <br /> <br />The West Vine Drain~gc Basin has a history of problems creat~d <br />by litorm runoff. Three aNaS which are known to have problems <br />includ~ the Irish Green Subdivision, the subdivision in the <br />northwest corner of the intersection of Taft Hill Road and <br />LaPorte Avenue and the Second Filing of the Hanna Subdivision, <br />Conversations with residents of the Irish Green Subdivision <br />indicated that nearly every year several homes have storm runoff <br />up to the level of the foundations. The majority of the homes <br />in the lower areaS of the subdivision have SUl'lP pumps and it <br />is not unusual to pump out 2000 gallons a day after an intense <br />or prolonged storm. Many furnaces have been ruined due to storm <br />runoff. After an intense or prolonged period of storm runoff, <br />the storm sewer, which consists of 12 inch diameter to 18 inch <br />diameter pipe, surch~rges consistently, after which it takes <br />12 to IB hours to dr~in the sump areas of the subdivision. <br />Storm runoff drains along lot lines between Webb Avenue and <br />IriSh Drive practically every ye~r, <br /> <br />! <br /> <br />the station in a 18 hour period, and photographs Were taken on <br />the 18th showing localized flooding in the West Vine Drainage <br />B",;in. A few of these phot("jgraphs are included on page" 11 <br />through 13 of this report. The remainder are included in the <br />'rechnical Addendum fot- this repotct on file with the' City, <br /> <br />'[he subdivision in the northeast corner of the intersection <br />of Taft lIill Road and LaPorte AVC:1ue is located in a sump <br />cre;:tcc! by +;hc Taft Hill R0",rl pmh"nkffit"nt. Durino :ninor storms, <br />the majority of the runoff is contributed from approximately <br />11 acres of the subdivision and 27 acres west of Taft Hill Road <br />and south of r,,-..porte Avenue and is forced to pond due to the <br />lack of facilities to carry it across or under Taft Hill Road. <br /> <br />A conversation with a resident of the Second Filing of the <br />Hanna Subdivision indicated that storm runoff t"\'as ponded w<="l of <br />Hanna Subdivision in an open field several tines du~ing intpnsf' <br />or prolonged stor~s, <br /> <br />Durinc M~Y of 1980, measur~bl~ pr~cipitation or a ~race occurred <br />eV0ry "<ly from the 4th through the 18th elt the Colorado Stilt.. <br />;]niversity we"t~,i'r ~tatio:-: lccated Cll the C,5,l:. mai.n campus. <br /> <br />From the 16Lh thro"Jgh the 16th, <br /> <br />1,43 inches was recOtcded at <br /> <br />-9- <br /> <br />-10- <br />