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<br />!I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />TABLE 1 <br />PHYSICAL FEATURES CONTRIBUTING TO DRAINAGE PROBLEMS <br /> <br />Natura 1 <br /> <br />Man-Made <br /> <br />Rio Grande River <br /> <br />Railroad embankments <br /> <br />Natural sumps <br /> <br />State Highway 17, U.S. Highway 285 <br /> <br />Flat Terrain <br /> <br />Hickory-Jackson irrigation ditch <br />Housing developments - grading <br /> <br />Since the drainage patterns are complicated by many natural and man- <br />made barriers, the study area was divided into eight basins (Figure <br />2), reflecting the natural and man-made barriers. The basins are <br />described in detail in Section IV of this report. <br /> <br />D. <br /> <br />DRAINAGE PROBLEMS <br /> <br />The A1amosa area is flat with many natural sumps and an average basin <br />slope of 0.1 to 0.2 percent, falling from the northwest to the south- <br />east, generally parallel and tributary to the Rio Grande River. The <br />development of the city west of the Rio Grande has resulted in the <br />additional blockage of the natural drainage. Existing buildings and <br />roads were constructed on existing grades without changing or improv- <br />ing the drainage patterns. <br /> <br />The drainage problems which confront the City of A1amosa and surround- <br /> <br />ing areas are generally defined to include: <br /> <br />1) No means of draining storm water from improved or developed <br />a rea s ; <br /> <br />2) The lack of adequately-sized stormwater conveyance systems; <br /> <br />-5- <br />