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<br />OJJ5J3 <br /> <br />, <br /> <br />PRCl <br />8lt8.ttcr ~/IIIA f) <br />September 28, 1995 RCL1s,6lr <br />Functional Requirements Document for PRSYM: <br />eRSS Modeling of Total Dissolved Solids <br /> <br />. <br /> <br />Dave King, Terry Fulp, Jayne Harkins, Srad Vickers 1 <br /> <br />1.0 Purpose <br /> <br />This document outlines the functional requirements for modeling of total dissolved <br />solids on a monthly time step in PRSYM. These requirements are based on the <br />current methodology used in the US Bureau of Reclamation (USSR) monthly policy <br />and planning modeling system for the Colorado River (the Colorado River Simulation. <br />System, or CRSS). This paper will also provide documentation of our current <br />understanding of that methodology. <br /> <br />2.0 CRSS modeling of Salinity <br />. 2.1 Introduction <br /> <br />The only water quality parameter modeled by CRSS is salinity, which is treated as a <br />conservative sl!.bstance. Temperature effects, precipit~tion and ion excha!Jge are <br />~ed, Therefore, the modeled parameter should be referred to as total dissolved <br />solids (TDS). In this document, we will use TDS and salinity interchangeably. <br /> <br />TDS concentration is computed at each inflow, diversion. .or returrLflow point in the <br />river system. Concentration is also computed in each reservoir based on the <br />assumption that the reservoirs are completelv mixed. Concentrations are reported in <br />units of milligrams per liter (mg/L) which is assumed equivalent to parts per million <br />(ppm). In CRSS, aqg,itional checls- ~d to minimum and maximum <br />COriCentrations and determining the effect of salinity control projects. <br /> <br />In CRSS, TDS conc;.eJJ!l:illinn is computed after the hydrologic mass balance in each <br />time step. In general, the method at most nodes is slm el hted mass <br />balancing. The exception is return ows which a I a I I sa 10 cup"). <br /> <br />. <br /> <br />J U. S. Bureau of Reclamation <br />