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Table 5. ETg calculated for the South Platte System based upon average weather and the
<br />2001 TM imagery. This is ETg and excludes precipitation.
<br /> Vegetation Open Water Combined
<br /> Avg Avg ETg Total Avg
<br />Reach Acres Acre Ft AF/Acre Acres Acre Ft AF/Acre Acres Acre Ft AF/Acre
<br />S.Platte 1 4,679 6,005 1.3 131 336 2.6 4,810 6,341 1.3
<br />S.Platte 2 1,310 1,203 0.9 150 401 2.7 1,460 1,604 1.1
<br />S.Platte 3 2,240 2,448 1.1 122 341 2.8 2,362 2,789 1.2
<br />S.Platte 4 4,391 5,535 1.3 225 645 2.9 4,616 6,180 1.3
<br />S.Platte 5 4,621 5,130 1.1 82 229 2.8 4,703 5,359 1.1
<br />S.Platte 6 2,577 2,921 1.1 96 266 2.8 2,673 3,187 1.2
<br />S.PIatte7 19,350 22,949 1.2 536 1,496 2.8 19,887 24,445 1.2
<br />S.Platte8 11,496 12,028 1.0 301 837 2.8 11,798 12,865 1.1
<br />S.Platte 9 4,383 6,564 1.5 131 364 2.8 4,515 6,929 1.5
<br />S.Platte 10 7,985 11,832 1.5 231 641 2.8 8,216 12,473 1.5
<br />S.Platte 11 11,400 14,051 1.2 454 1,277 2.8 11,853 15,328 1.3
<br />S.Platte 12 21,384 24,870 1.2 756 2,118 2.8 22,141 26,988 1.2
<br />S.Platte 13 5,664 8,150 1.4 262 728 2.8 5,926 8,878 1.5
<br />Poudre A 649 816 1.3 52 119 2.3 701 935 1.3
<br />Poudre B 829 1,040 1.3 18 44 2.4 848 1,084 1.3
<br />Poudre C 2,359 2,806 1.2 15 40 2.7 2,375 2,847 1.2
<br />Trib 1 19,830 27,140 1.4 7 20 3.0 19,836 27,160 1.4
<br />Trib 2 47,813 59,291 1.2 1 4 2.9 47,814 59,295 1.2
<br />Trib 3 15,762 17,128 1.1 9 27 3.1 15,770 17,155 1.1
<br />Trib 4 9,408 10,461 1.1 2 6 2.8 9,410 10,467 1.1
<br />Trib5 1,112 1,031 0.9 11 31 2.9 1,122 1,063 0.9
<br />Trib6 3,104 2,027 0.7 5 16 3.0 3,109 2,043 0.7
<br />Summary 202,346 245,427 1.2 3,599 9,985 2.8 205,945 255,413 1.2
<br />Table 7 provides a comparison of the precipitation and ETo for 2001, for the longer-term
<br />averages (30-year precipitation record, 11 yr ETo record). The values vary through the
<br />study area from the farthest upstream, represented by Fort Collins and for the farthest
<br />downstream, represented by Holyoke. All of these calculations were raster-based using
<br />the interpolated precipitation.
<br />The degree of localized recharge is somewhat variable on the South Platte system but is
<br />dependent upon regional irrigation patterns. High cover of phreatophyte vegetation
<br />occurs in locations where flows in irrigation canals and drainages create localized
<br />recharge. The heavily recharged areas often contain small water bodies where surface
<br />depressions intersect the local water table. At the other extreme, phreatophyte vegetation
<br />in the tributaries south of the river (Figure 7) tends to be sparse and discontinuous, and
<br />irrigation-induced recharge sparse but localized. As a generality along tributaries, the
<br />water table lies deeper and small water bodies are rare (Tables 5 and 6).
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