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OJ-,Q,'l'i .1. l) ;;.. . mass of salt, and the resulting concentrations. Honthly values and descriptive statistics as shown. CRT plots are presented for graph- ical visualization. Flows for the upstream boundary stations are typical of natural west- ern streams with little regulation. 5tanda1'd deviations exceed the mean monthly flows. Progressing dOlmstl'eam, the effects of regulation a1'e apparent with the standard deviation tending toward a smaller proportio~ of thc mean. Two tabulations for Colorado River flows at Lees Ferry are included. One corresponds to the previously described unregulated present mod- ified flows (denoted by the caption INCLUDES EVAPORATION in paren- theses) while the other has the averar.e monthly evaporation amounts added to the flows. The average evaporation amounts are as fol- lows: [3] ',Ionth Evaporation (1,000 acrc-feet) ~lonth Evaporation (1,000 acre-feet) January February Harch April Ilay June 22 20 26 29 39 45 .July August September October November December 51 52 45 40 34 29 Total 432 Before describing the computation of ungaged tributary inflows, the reservoir parameters and evaporation rates required in the computa- tations are discussed. Reservoir Parameters Basic reservoir parameters used for all runs include: (1) Definition of contents and outlet capacities - Figure 3 sho\.s the four zones into "hich each reservoir is divided. These zoneS are defined by input of t.he levels. defining the top of dead storage (Le., inactive or conservation pool), the ------------------- . The program uses the surface content volumes corresponding to given levels or elevations. In this report. the term "level" should be taken to mean surface content volume or simply reservoir volume. All volumes include dead storage but not bank storage. 7