FLOOD06837 - Laserfiche WebLink

Home Browse Search

I I I. I I I I I I I I I I I I I I I I I A third pump is located at East Avenue and 12th Street, Basin V. We were not able to obtain data from the pump to determine capacity. It is inoperable because of electrical failure due to being struck by lightning. It is not recommended to repair the system or add pumps as the alternates include the installation of larger gravity pipes. B. BASIN I Basin I is in the northwestern portion of the study area and extends approximately 2.5 miles above West Avenue at Main Street. It is bounded on the southwest by U.S. Highway 160/285 and on the east by Alamosa Avenue. This basin has the most ponding areas of the eight basins studied. The total drainage area of Basin I is approximately one square mile. Land use in the basin is approximately one-third undeveloped, and the remainder is developed with commercial structures. The southern boundary of this basin (U.S. 160/285) is higher than the adjacent land, blocking the natural drainage and diverting stormwater to the southeast towards town, where the terrain flattens out and causes water to pond. Anticipated future development in Basin I includes residential expansion in the undeveloped areas of the northwest, with commercial development along the frontage of U.S. Highway 160/ 285. Currently the lower third of this basin has an existing storm sewer system which is overloaded. In the upper portion of the basin, irri- gation and diversion ditches convey runoff into the Rio Grande River (Basin II). These ditches should remain in place as a part of an im- proved system. Eventually the ditches may need to be improved such as lining them with concrete, grass or rock, or even enlarging them to increase the flow conveyance capacity. The general drainage flow in the basin is to the south and east. Ponding occurs at the lower end of the basin at 6th Street and West -17-