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2-,P PACIFIC sOUTHWEST' INTER-AGENCY cQM.I1"l'l.'EE PRECIP1'.l!ATION YEAR--A 12-month period chosen to divide precipitation data into a series of events for cOnvenience in study and canparison. The beginning date for the precipitation year should be given when this tem is used. PRIMARY BENEFITS--The value of goods and services direct~ resulting , fran the project, less associated costs incurred in realization of the benefits and any induced costs not included in project costs. TYPes of primary benefits may include danestic, municipal, and industriaJ. water supply, irrigation, fiood prevention, la.nd stabilization, drainage, recreation, and fish and wildlife. PRIMARY TREATMENT--In sewage treatment, the removal fran sewage and , disposaJ. of larger solids by screening and more fine~ divided solids by sedimentation. PRJME POOER--Hydroelectric power avai;Lable fran a plant on a continuous basis under the most adverse hydraulic conditions contemplated. PROBABLE MAXIMUM PRECIPITATION--Ml.ximum precipitation of a given amount and duration that can reasonably be expected to occur in a drainage basin. PROJECT BENEFITS--See BENEFITS. PROJECT ECONOMIC COSTS--The value of all goods and services (land, labor, and materials) used in constructing, operating, and maintaining a project or program, interest during construction, and all other identifiable expenses, losses, liabilities, and induced adverse effects connected therewith, whether in goods or services, whether tangible or intangible, and whether or not canpensation ia involved. Project econanic coats are the SUlll of installation costs; operation; maintenance; and replacement costs; and induced costs. See INIllJCED COSTS. PROJECT YIELD--The yield which is attributed to all features of a project including integration. Usually it will be the same as fim yield, but is not necesaari~ so in all instances. POM:P5IID S!OO1lAG!I;'-Storage of water used for developnent of hydrOelectric power in a reservoir by pumping it into the reservoir during the off-peak. period of operation of the plant, utilizing for such pumping, surplus power generated in excess of load requirements. Such water ia later used to develQp power during the period of peak demand. The reservoir is us1,laJ.J;y at a considerable elevatiCll above the power plant, providing" thereby, 'a large head, which requires a relative~ small ammnt of water and storage space. This method of supplying peak power often results in a considerable improvement in the load factor of the main plant and a consequent saving in equipment. Cyclic filling of a reservoir by pumping off-peak periods and subsequent release of stored water to generate hydropower during periods of peak power demand.