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<br /> <br />~ <br />~ <br />011 <br />'UlI <br /> <br />Average single-storm TDS concentrations ranged from 181 mg/l in Coal Creek to <br />7,680 mg/1 in Wattis Branch. Surface runoff during summer convectional storms <br />produced an average of .07 t/ha (.031 tons/acre) of salt during the summer and <br />fall of 1981. Parti cu1 ar1y hi gh concentrati ons of TS and TDS occurred in <br />runoff on all three watersheds during the first monitored storm following a <br />long, dry period, suggesting a flushing of accumulated sediments and salts. <br />TDS/TS ratios in the discharge were generally representative of those found in <br />watershed soils (2-3%). The exception was early on the rising limb of the <br />hydrograph, where a distinct peak in the ratio of TDS to TS occurred. This <br />suggests an initial flushing of concentrated sources of in-channel salts, <br />followed by a predominantly sediment controlled salinity transport mechanism. <br />The average discharge of salts on an annual per hectare basis was .07 t (.031 <br />tons/acre). <br /> <br />Conclusions <br /> <br />The results suggest that salts (possibly occurring as efflorescence) accumu- <br />late and concentrate over time on the channel surface. This resulted in high <br />salt to sediment ratios early on the rising limb of the hydrograph. Subse- <br />quent sa1 t to sediment rati os were simi 1 ar to those found in watershed soi 15, <br />implying that erosion and sediment transport are important salinity transport <br />mechanisms. <br /> <br />8 <br />