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8 <br /> with 75% occurring in the May to October period. (See Tech. <br /> Paper 37, U.S. Dept. Cc mâ–ºerce, 1959.) <br /> ELEVATION AND TOPOGRAPHY <br /> The NUCLA Mine Lease lies on a gently to strongly rolling plateau <br /> or bench above the San Miguel River Valley about 15 miles north <br /> of Nucla in Montrose, County, Colorado. Elevations range from <br /> about 5600 to 5800 feet above sea level. Slopes are steep <br /> (30-40%) adjacent to some of the drainageways but gentle slopes <br /> of 2-7% occur on the divides. Some southward flowing intermittent <br /> drainageways cross the area. The 116-acre tract is gently sloping <br /> (2-10%) except for a few small ridges and streamside slopes of <br /> 10-20%. This tract lies at 5672' to 5767' elevation, sloping <br /> generally southwestward in the southeast forty and southeastward <br /> in the southwest forty toward a small drainageway. <br /> DRAINAGE AND PREVIOUS IRRIGATION <br /> Three small waterways cross the tract, one paralleling the stripped <br /> area in SW4 SE4 leaving the tract (Map 1) at the extreme south- <br /> west corner of this forty. The next drainageway passes to the <br /> southwest corner of SE4 SW4 just east of the ridge which lies <br /> across this forty and the forty to the west. The third drain <br /> lies just west of this ridge and flows across the southeast part <br /> of SW4 SW4. None are deeply entrenched, all are crossable by <br /> machines and there are no mappable alluvial depositions. <br /> These drains serve as a part of an abandoned and partially dis- <br /> rupted irrigation system, one branch of which enters by a canal <br /> flowing southeasterly across the NE4 SW4 of Section 25. This feeds <br /> three small holding tanks (.06-.15 acres) which lie in a row in <br /> west part of SE4 SW4 and one which lies just south of the farm <br /> house in north center of SW4 SW4. The canal is tree-lined from <br /> the farm house northeastward for about 1200 feet. A ditch flows <br /> westward along the north forty line of SW4 SW4 and several small <br />