Laserfiche WebLink
<br />OGuZOo <br /> <br />confluence object will not be capable of storing water. <br /> <br />Water Quality <br /> <br />As previously mentioned, the model will have the capability to track salinity as a conservative <br />substance, As is done in CRSS, the model will assume reservoirs are of uniform salinity and <br />completely mixed at all times, mg/L is equivalent to ppm, and a conversion factor of 735 acre- <br />ft-mg/L = 1,000 tons of salt. In this part of the discussion, flow (Q) will be assumed to be <br />represented by a constant volume in each time step. <br /> <br />For a diversion object, the concentration of water diverted will be assumed to be at the <br />concentration at the point of diversion (either river reach or reservoir). The concentration of the <br />return flow will be user-specified (to account for salt pickup or water quality improvement <br />projects). The resulting concentration in a river reach will be a flow-weighted average given by <br /> <br />COul = <br /> <br />C",Q", + C,f2if <br />Q", + Qif <br /> <br />(16) <br /> <br />where Cm is the concentration of salt in the river prior to the return, Qm is the flow in the river <br />prior to the return, C"is the concentration of salt in the return flow, and Q" is the return flow, <br /> <br />For a reservoir, the concentration of the water lost to bank storage is assumed to have the same <br />concentration as that of the reservoir. Water in bank storage is assumed to be held in a <br />completely mixed tank, so the concentration of water in bank storage is given by <br /> <br />Cbsl = <br /> <br />CruJ3SI + Cbsl_, V bsl-' <br />BSI + V brl-' <br /> <br />(17) <br /> <br />where Cre" is the concentration in the reservoir, B,., is the volume of water lost to bank storage, <br />C"'.l" is the initial concentration in bank storage, and V "'.t-l is the initial volume of water in bank <br />storage, Water gained to a reservoir from bank storage is assumed to be at the current <br />concentration of the water held in bank storage, <br /> <br />For a reservoir, the concentration is computed using a weighting factor given by <br /> <br />Qin,t + Q""'I <br />VUSJ-1 + Vres.r ... 2 V drJ <br /> <br />W; = 1 + 0.6 <br /> <br />(18) <br /> <br />where Q;n.l is the inflow into the reservoir, Qoou is the outflow from the reservoir, and V W.l is the <br />volume of the dead storage in the reservoir. The reservoir concentration is then given by <br /> <br />The concentration of the release from a reservoir is given as <br /> <br />8 <br /> <br />DRAFf: February 17, 1994 <br />