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mentioned for both Sites SW-N104 and SW-N105,~the water type determined for SW-N106 was <br />a calcium bicarbonate sulfate <br />At Site SW-N106, pH averaged 8.08 units, and ranged between 7.68 and 8.41 units. The mean <br />value determined for TDS was 179.7 mg/I, and TDS varied from 112.0 to 270.0 mg/1. TSS <br />averages 107.7 mg/L, ranging from 16.0 to 406 mg/I. FeT, Fep and MnT average 1.52 mg/1, .02 <br />mg/I and .05 mg/I, respectively. <br />From the previous discussions of water quality at Sites SW-N104, SW-N105 and SW-N106, the <br />irrigation water monitored in the West lateral showed little chemical variability as flow was <br />monitored in the downstream direction. Of the parameters mentioned, only total suspended solids <br />(TSS) and dissolved iron (Fep) showed trends of slight increases {mean values) as irrigation water <br />progresses down the ditch. <br />Relationships Among Flow. TSS and TDS. The interrelationships among certain physical and <br />chemical parameters in surface water often control the chemical quality. Generally, as the <br />discharge (flow) of a stream increases, so does the concentration of total suspended solids (TSS). <br />For streams that commonly experience elevated levels of TSS (10° to 105 in semi-arid <br />environments), total dissolved solids (TDS) commonly is inversely related to TSS, that is, as TSS <br />level increase, TDS concentration will decrease. This inverse relationship between TSS and TDS <br />will result in lower proportions of dissolved constituents while conserving the total chemical load <br />of the water. <br />In order to investigate the significance of relationships among flow, TSS and TDS in streams <br />monitored at the New Horizon 2 area, simple linear regression correlation analyses were performed <br />on flow, TSS and TDS values collected simultaneously at each surface water site. Using flow as <br />the independent variable, discharge was regressed against TSS and TDS. Also, using TSS as the <br />independent variable, TSS was regressed against TDS. <br />TSS showed little to no correlation with flow. The range of correlation coefficients (r~ values) <br />determined for flow versus TSS during the irrigation season were from .000 to .298. For periods <br />between the irrigation seasons, rz values ranged from .000 to .447. These calculated correlation <br />(Revised 25 Jul 2002) 2.04.7-34 <br />