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<br />001282 <br /> <br />RESBAL <br /> <br />RESQAL <br /> <br />RETURN <br /> <br />ROOT <br /> <br />ROUTE <br /> <br />RSALT <br /> <br />RULES <br /> <br />RULMEAD <br /> <br />Subroutine RESBAL operates reservoirs. This <br />involves storing inflows, computing releases, <br />bringing contents to target levels, meeting <br />maximum and minimum contents and release con- <br />straints, computing evaporation, bank storage, <br />water surface elevation, and surface area, and <br />checking the mass balance of a reservoir. This <br />subroutine may be called several times during any <br />given month. <br /> <br />Subroutine RESQAL computes the end-of-month con- <br />centrations of salt in reservoirs and releases. <br />The concentration in a reservoir is based on salt <br />inflow and salt in the reservoir at the beginning <br />of the month. The concentration of a release is <br />a weighting of the beginning and ending reservoir <br />concentrations. <br /> <br />Subroutine RETURN computes the quantity and qual- <br />ity of return flows and sends them to their des- <br />tinations. The subroutine also computes the per- <br />cent a demand was shorted during hydrologic <br />balancing (HYDRBAL) and writes shortage messages <br />to a temporary file if a shortage exists. <br /> <br />Function ROOT computes the real root of a polyno- <br />mial equation from the second to the ninth de- <br />gree. If no root is found after 20 iterations, <br />none is considered to exist and a value of zero <br />is returned. <br /> <br />Subroutine ROUTE routes water from a reservoir to <br />a downstream demand that is in short supply. The <br />subroutine routes water through any reservoirs <br />that are on the routing path. <br /> <br />Subroutine RSALT routes salt down through the <br />system, after the system has been balanced by <br />subroutine HYDRBAL. <br /> <br />Subroutine RULES sets the target contents rule <br />curves for the upper basin reservoirs, except <br />Lake powell, based on the elevation of Lake <br />Powell, power generation criteria, flood control <br />criteria, and the ratio of system contents to <br />system capacity. The subroutine also resets the <br />rule curve for Lake Mead. <br /> <br />Subroutine RULMEAD sets the target contents rule <br />curve for Lake Mead based on the creditable and <br />available space in the upper basin reservoirs and <br />required flood control space in Lake Mead. The <br />subroutine is called in months August through De- <br />cember. ' <br /> <br />8 <br />