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There were a number of instances where visual evidence indicated that phreatophyte <br />vegetation existed outside the alluvial extent shapefile provided by LRE that defines the <br />boundary of the study area for phreatophyte ET estimation (blue portions of Figure 5). <br />The excluded lands may include both incidental water use by native vegetation in areas <br />bordering irrigated lands, and phreatophyte ET in areas outside the alluvial boundary <br />(demonstrated in Figure 6). Fortunately, these areas were relatively limited in extent <br />compared to the areas captured within the alluvial boundary <br />Figure 5. <br />The polygon capturing the phreatophyte <br />riparian vegetation is shown highlighted <br />in red. The mapped irrigated lands are <br />portrayed in green and the line marking <br />the mapped boundary of the alluvium is <br />mapped as a blue line. The background is <br />the USGS DOQQ. <br />~~ <br />;~ , <br />~F ~ i <br />~ ~~~ .~~^ <br />5~ <br />~ ~ ~L <br />'.~ A i ... <br />c" ~, ~ ,yl,'~. _ <br />~~. <br />d ~ • ' emu"..: ~ i' "' ~". ems` l+r' _ <br />. ~' ~ ~ : , <br />.~~ i <br />--' ,-° <br />.~~.;~ <br />4..Y~ ry'i <br />~ ~~ <br />,, °:.~~ <br />Baekground: LandSat T~VI Faxse Color <br />Phreafiophyte Boundary <br />Aluvial Extent ~ <br />~~ Irrigated Lands o n5 <br />~~~ame~e« <br />Figure 6. <br />The boundary of the mapped alluvium is <br />indicated by the dark blue line (this is an <br />enlarged portion of Figure 5) displayed over <br />the TM7 data. Only that phreatophyte cover <br />(yellow boundary) inside the alluvial <br />boundary was considered for estimation of <br />ET. Hence, the springs visible above this <br />boundary were not counted in the ET <br />estimate. <br />10 <br />