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Table 2. Irrigated Acreage and Historic Consumptive Use -Home Ditch+ <br />Field Years Pasture and Hay Historic Consumptive <br /> Grass (acres) Use (acre-feet per <br /> year) <br />1. Small field south of pond 1928-2003 1.8 2.6 <br />2. Field north of old driveway° 1928-2003 13.0 18.5 <br />3. Field south of old driveway 1928-2001 39.9 56.7 <br />3a. Field north of new driveway 2001-present 10.7 15.2 <br />3b . Field south of new driveway 2001-present 22.3 31.7 <br />3c. Field south of Line Camp Pit 2001-present 6.9 9.8 <br />TOTAL 1928-2001 54.7 77.8 <br />TOTAL 2001-2002 48.2 68.6 <br />TOTAL 2002-2003 42.2 60.0 <br />TOTAL 2003-2004 32.4 46.1 <br />.Based on 1928 through 2003 average. <br />The recorded diversions averaged 191.8 acre-feet per year and ranged from 0 acre-feet in ten <br />years to 563.2 acre-feet in 1985. The average first day of recorded diversion was 26 May and <br />ranged from 1 May (2001) to 24 June (1981). The average last day of recorded diversion (other <br />than 0.25 CFS for stock and domestic water) was 4 September and ranged from 9 July (1974 and <br />1991) to 31 October (2001). The additions to Table 2 (above) show the water made available by <br />the dry-up agreement (based on the 76-yeaz average): 9.2 acre-feet in 2001, 17.8 acre-feet in <br />2002, and 31.7 acre-feet in 2003. <br />Climatic Conditions <br />For calculation of crop irrigation requirements and historic consumptive use since 1984, monthly <br />and daily mean, high, and low temperatures were estimated from NOAA records for Rico <br />(elevation 2682 meters) Mancos5 (elevation 2094 meters), and Dolores (elevation 2115 meters) <br />weather stations, adjusted linearly for elevation by the factor of 3.6 degrees F per 1000 feet (1 <br />degree F per 84.67 meters) of elevation. Monthly precipitation values were estimated from <br />NOAA records for Dolores adjusted geographically using the NOAA-approved USDA-NRCS <br />Colorado Average Annual Precipitation Map. This information is provided at Attachment 4 to <br />the SWSP. This data was used to estimate the growing season for Line Camp for each yeaz. <br />Crop Irrigation Requirements <br />Using the modified USDA-NRCS Blaney-Criddle methodololry and the data described above, <br />The crop irrigation requirements for the hay and pasture grass irrigated by the Home Ditch were <br />calculated for the period 1985-2003. The requirements increased slightly, to 107.5 acre-feet <br />average (1.97 acre-feet per acre) for the period 1971-2003, due mostly to warmer and drier <br />° The original driveway was replaced by a new driveway approximately SDO feet further south, in comp]iance with <br />requirements of the Colorado Department of Transportation. The old driveway was blocked from connecting to <br />S.H, 145 but is still used for access to barns, sheds, and fields, from the Line Camp headquarters. <br />s Rico records for temperature are not available for 2001-2004, and so Mancos temperatures were used for that <br />period. Dolores records cover precipitation, but no temperatures until 20(13. <br />6 <br />