Laserfiche WebLink
<br />MODSIM <br /> <br />then computes. -"cost" Cas' <br />is . <br /> <br />CiS = -[1000 - (OPRPi'10)] <br /> <br />(S) <br /> <br />Notice that ciS is a negative number, which represents a benefit associ- <br /> <br />ated with carryover storage. The cost associated with flow in the final <br /> <br />atorage link is always set at zero. The oosts on the spill links are <br /> <br />siven the highest positive numbers of any link: 10,000 times' the pre- <br /> <br />ferential order of spillage. <br /> <br />Evallorat ion <br /> <br />Evaporation loss from reservoirs is accounted for as follows: <br /> <br />Compute for each reservoir 1: <br /> <br />Ei~ax:. ei [Ai(Si) + Ai(Simax)]/2 <br /> <br />(6) <br /> <br />Eimin . ei [Ai(Si) + Ai(Simin)]/2 <br /> <br />(7) <br /> <br />Eitarget - ei [Ai(Si) + Ai(Ti)]/2 <br /> <br />( 8) <br /> <br />where 'ei is evaporation rate for reservoir i (e.s.. feet per month) <br /> <br />the current period: Ai is the (interpolated) area-capacity table for <br /> <br />for <br /> <br />reservoir i, S. is storage at the besinnins of the cnrrent period. Sim <br />1 ax <br /> <br />is maximum capacity, S. i is dead storage, and T. is the user supplied <br />1lII n 1 <br /> <br />tarset level. <br /> <br />'The storage link parameters are then adjusted as follows: <br /> <br />for desired storage links: <br /> <br />((S. . + E. . ), (T. + E't t) ,c'S] <br />1lII1n . 1lII1n 1 1 arse 1 <br />for final storage links: <br /> <br />[0, (Sima: - Ti) + (Eima: - Eitarget) ,0] <br /> <br /> <br />This means that the link upper bounds are adjusted to carry enough <br /> <br />now to accoUllt for '6vaporation loss, and the lower bound on the desired <br /> <br />storage link is increased so that when evaporation is removed, it will <br /> <br />16a <br /> <br />, <br />