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I I I I I I I I I I I I I I I I , I I I I I Avenue, since there is no outlet to the Rio Grande River. A pipe in Main Street and West Avenue does allow the water to eventually drain from the basin to the east to the Rio Grande River. c. BASIN II Basin II is also in the northwestern portion of the study area, ex- tending to the northwest about two miles above the low point near La Veta Avenue and Lincoln Street. The basin is bounded on the north- east by the Rio Grande River. The total drainage area is approximately 0.5 square miles, generally draining to the east and southeast. One-fourth of Basin II is unde- veloped with the remaining three-quarters developed with residential land uses. Small areas of local ponding exist as a result of the flat terrain and an undersized storm sewer system. A major ponding area in Basin II is near Oliver Avenue and Wolf Street. Stormwaters accumulate regularly making the area undevelopable. A levee adjacent to the Rio Grande River also prevents local drainage into the river, causing some ponding. The outfall point for the basin is at La Veta Avenue along the levee. D. BASIN III Basin III is located in the north-central portion of the study area. It is bounded,on the north and east by the river, on the south by the railroad tracks, and on the west by La Veta Avenue. The total drain- age area of this basin is approximately 0.4 square miles. This basin is totally developed with both residential and commercial uses, in- cluding the downtown area of Alamosa. Most of the streets in the area have small storm sewer~8 to 21 inches in size, that frequently are overloaded. However, the flooding that has occurred in this basin has resulted in few complaints in the past 10 or 15 years. Based on the l' = 100" scale mapping, some areas are flat but the general drainage trend is towards the east where existing pipes -18-