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D.C. Goodrich et al. /Agricultural and Forest Meteorology 105 (2000) 281 -309 <br />2000). At the stand level, MacNish et al. (2000) car- <br />ried out a water balance on a 122 m portion of the <br />Lewis Springs stream reach during the March (no <br />transpiration), April and June synoptic measurement <br />periods. In this stream reach there were few mesquite. <br />These measurement periods did not have any precip- <br />itation, surface runoff, or large changes in residual <br />soil moisture over the short period of the synoptic <br />measurement periods insuring the C/W were almost <br />exclusively using groundwater and/or soil moisture. <br />Also, by limiting the stand level water balance to these <br />synoptic measurement periods we were able to assess <br />0.5 <br />N <br />0.4 <br />m <br />1'tN 0.3 <br />0 <br />n 0.2 <br />0.1 <br />4 <br />0 <br />-.04 <br />c <br />A-0 <br />5 -.03 <br />0 E <br />S <br />g -.02 <br />c <br />Q m -.01 <br />3 <br />30 <br />25 <br />E 20 <br />m 15 <br />o_ <br />_ 10 <br />291 <br />the validity of the scaled C/W transpiration estimates <br />directly without the use of the calibrated P -M model. <br />For the water balance at the larger riparian corridor <br />level, a 10 km river reach starting from cross - section <br />three at the Lewis Springs study site to the USGS <br />stream gage near Charleston, AZ was selected. An <br />illustration of the classified land cover as well as the <br />pre- and post- entrenchment alluvial areas for the ripar- <br />ian corridor for this river reach are illustrated in Fig. 3. <br />The discharge records at the upstream (Lewis Springs) <br />and downstream (Charleston) end of the reach (top of <br />Fig. 4) were examined to select a time interval over <br />Estimated <br />100 150 200 250 300 350 <br />QOY 1997 <br />35 <br />30 <? <br />25 <br />LO <br />20 <br />15 H <br />log <br />5 m <br />0 <br />4 <br />-5 <br />Fig. 4. (Top) streamflow at Lewis Springs cross - section 3 and Charleston USGS gage; (middle) average daily gradient, BLM Well No. 5 <br />to 4 at Lewis Springs; (bottom) rainfall depth and average daily temperature recorded at the Lewis Springs mesquite tower. <br />