biochemical oxygen demand, groundwater, aquifer, gallonage, wastewater, reservoirs, exceedance, sedimentation, water, turbidity, hydrograph, percolation, forebay, sewer, evapotranspiration, alkalinity, potability, interfacial tension, discharges, effluent, orthophosphate, drainage, sumps, irrigation, hydrological, salinity, diking, snowpack, leachate, pollutant, clarifiers, watersheds, floodplain, drainage basin, reservior, upflow, basin, nitrate, underdrain, meterage, hydrologic cycle, river basin, freshet, berming, calcium oxide, rainfall, inspiratory, nitrification, flowage, gallons, seepage, osmotic pressure, ensiling, sewage, backflow, psia, channelization, sediment, subgrade, salination, soakaway, precipitation, cusec, depuration, cubic meter, decantation, volatilization, ingression, wells, frost heaving, compaction, chlorides, hydrogeology, floc, underflow, sorption, contaminants, impaction, coliform, effluence, fumigants, outfall, reus, tonnage, soils, aeration, rfd, freshwater, flocculation, riparian forest, unappropriated, digestor, eluent, ad valorem tax, sodic, phosphorus, carbon tetrachloride, siphonage, influent, sinkage, leaching, soil erosion, expenditure, output, consumption, earning, earnings, production, rental, rentals, wages, capitalization, consumptions, expenditures, inflow, payrolls, utilisation, amounting, billings, costs, demand, disbursement