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C6. This feature (Figure 7.) is a continuation of C5, and directs surface tailwater runoff <br /> through the primary alluvial terrace to a terminus at the South Platte River. As with feature <br /> C5, this feature is not a defined drainage channel, but a flow path following topographic <br /> lows to the South Platte River. <br /> D1. This feature is a constructed irrigation water pond, located south of the West Farm <br /> South Parcel on an adjacent farm. This feature is one source of irrigation water for locations <br /> within West Farm. Water from this pond is conveyed through the irrigation ditch D2. <br /> D2. This is a man-made irrigation water ditch to convey water from the irrigation water <br /> pond D 1 to features B 1 and C 1,and ultimately to the irrigated agricultural fields at the West <br /> Farm South Parcel. <br /> Fl. This feature is the Hogson Ditch, a constructed irrigation supply ditch conveying <br /> irrigation water from off-site, south of West Farm to irrigate fields in the West Farm South <br /> Parcel. Portions of this ditch are concrete lined. <br /> F2. This excavated feature is a man-made irrigation sump that contains Hogson Ditch <br /> irrigation water,prior to release to West Farm South Parcel agricultural fields. <br /> F3. This feature is a groundwater irrigation pivot pump, supplying irrigation water to West <br /> Farm agricultural fields through a system of earthen and concrete lined ditches. <br /> G1. G1 is a man-made irrigation tailwater ditch (Figure 8.) originating below the pivot <br /> irrigated field in the southwest quadrant of the West Farm. <br /> G2. This tailwater drainage feature is distinguished from feature G1 as it appears on the <br /> USGS 1978 topographic map as a designated blue line drainage. As with feature B3, the <br /> current alignment of G2 appears to have been modified from the original noted USGS <br /> feature to better accommodate agricultural operations. The source of water in the ditch <br /> appears to originate solely from irrigation to the agricultural operations. <br /> G3. Feature G3 (Figure 9.)conveys agricultural water through the West Farm South Parcel <br /> from south to north. Segments of the feature follow the identified blue line of the 1978 <br /> USGS topographic map closely while in reaches to the north,the drainage channel has been <br /> significantly straightened and realigned. <br /> H. This feature is a relict of the railroad grade construction to the east along the South Platte <br /> River. This feature is a swale running north-south along the elevated rail corridor, and is <br /> presumed to be the source of fill for the railroad grade. It does not connect to any of the <br /> other features of West Farm, and though it exhibits some features of wetlands, its <br /> discontinuous nature, anthropogenic origins, and lack of hydrologic connectivity to the <br /> regional groundwater aquifer system led us to conclude it was likely non jurisdictional. <br /> L.G.Everist West Farm Jurisdictional Determination Request Page 7 of 14 <br />