Sediment load 



irrigation water, p. 171 



watershed management, p. 177 

 Sediments 



adverse effects, p. 47 



aquatic life, p. 47 



estuaries, p. 76 



European Inland Fisheries Advisory Commission, p. 47 



fresh water, p. 34 



fresh water fish, p. 47 



lakes, p. 47 



marine and estuarine organisms, p. 36 



sea water, p. 76 



streams, p. 47 



suspended solids and fresh water fisheries, p. 47 



turbidity, p. 47 



waterfowl, p. 38 



water quality, p. 168 



yield of fish relationship, p. 47 

 Selenium 



phytotoxicity, p. 154 



plants concentration, p. 163 

 Semiarid climates, p. 167 

 Separation techniques 



boiler feed water, p. 193 



cooling water, p. 193 



water analysis, p. 178 

 Settleable solids see Sediments 

 Sewage bacteria 



irrigation water, p. 162 

 Sewage effluents 



prohibition against untreated, p. 37 

 Shellfish 



bacteriological criteria, p. 37 



conforms, p. 37 



microorganisms, p. 89 



pathogenic bacteria, p. 89 

 Sheep 



saline water tolerance, p. 134 

 Shrimp 



relative toxicity of pesticides, p. 37 

 Silts 



Back Bay, Va., p. 96 



Currituck Sound, N.C., p. 96 



turbidity, p. 47 

 Silver 



toxicity — sea water, p. 85-86 

 Silvex 



irrigation water, p. 159 

 Snails 



intermediate hosts, p. 141, 142 

 Society of Soft Drink Technologists, p. 212 

 Sodium 



irrigation water, p. 115, 164 

 Sodium adsorption ratio 



acidic soils, p. 173 



humid areas, p. 173 



irrigation water, p. 115, 155 



soil contamination, p. 164, 166 

 Sodium arsenite, p. 138 



Soft drink industry see Carbonated beverage industry 

 Soil chemical properties 



adsorption, p. 173 



arid regions, p. 173 



humid areas, p. 173 



plant growth, p. 147, 151 



salinity, p. 173 



trace elements, p. 151, 152 

 Soil chemistry, p. 44 

 Soil classifications, p. 167 



Soil contamination 



sodium adsorption ratio, p. 164, 166 

 Soil environment, p. 144 

 Soils 



humid climates, p. 172 



permeability, p. 170 

 Soil temperature 



plant growth, p. 157 

 Soil types 



irrigated lands, p. 152 

 Soil water movement 



evapotranspiration, p. 145, 148 



plant growth, p. 147 



water table, p. 145 

 Soil-water-plant relationships, p. 131 



irrigated lands, p. 144, 145 



nutrient requirements, p. 151, 155 



plant morphology, p. 147 



salinity and plant growth, p. 147 



salt tolerance, p. 148 

 Solar radiation 



ORSANCO committee stream findings, p. 48 



see also Ultraviolet radiation 

 Solute suction 



plant growth, p. 147 

 Southwest U.S. 



water quality, p. 168 

 Spawning 



floating materials, p. 48 



water temperature, p. 69 



zones of passage, p. 31 

 Spectroradiometer 



color, p. 76 

 Sphaerotilus 



biochemical oxygen demand, p. 51 



growth fostered by floating materials, p. 48 

 Spirogyra 



chemical composition, p. 55 

 Sprinkler irrigation 



chlorides adsorption, p. 156 



humid climates, p. 172 



pathogens transmission, p. 161 



sediment load — irrigation water, p. 175 

 SS see Solute suction 

 Standard Methods for the Examination of Water and 



Wastewater, p. 21 

 Steady state leaching requirement formula 



U.S. Salinity Laboratory, p. 169 

 Steam, p. 191 

 Steel industry 



water properties, p. 206 



water quality requirements, p. 207 



water reuse, p. 205 



water treatment, p. 206 



water utilization, p. 205, 205 

 Steel plants see Industrial plants 

 Stock water, p. 112, 113 



algae, p. 137 



algal poisoning, p. 137 



antimony, p. 135 



arsenic, p. 135, 135 



bacteria, p. 138 



beryllium, p. 135 



bioindicators, p. 115, 131, 131 



boron, p. 135 



cadmium, p. 135 



chlorides, p. 135 



chromium, p. 135 



cobalt, p. 135 



copier, p. 135 



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