A section of sewer constructed lower than adjacent sections to pass beneath a valley, watercourse or other obstruction. It runs full or at pressure greater than atmospheric because its crown is depressed below the hydraulic grade line. In engineering reports, the tabulation and consideration of the physical data present requirements and probable future requirements pertaining to an engineering project. It should include the main features and principles of the design. The flow, usually in million gallons per day, that a treatment plant can effectively treat according to engineering criteria.
Uses can include coldwater fisheries, public water supply, agriculture, etc.
Owner requests bid proposals from consrtuctors and contracts with the selected bidder. The period of time that a water or wastewater flow is retained in a basin, tank or reservoir for storage or completion of physical, chemical or biological reaction. The solid residue remaining after removal of some or most of the water from a wet biosolids by evaporation, draining, or filtering. Dewatering is distinguished from thickening in that dewatered biosolids may be transported by solids handling procedures. Commonly made of carborundum, alundum, metal or plastic materials.