WSP00241

• File Number: 8430.500
• Description: Platte River-Platte River-Water User Groups and Conservancy Districts-Denver Water
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 6/1/1957
• Title: Denver Board of Water Comm Reports 1957-Report on Comprehensive Studies of the Denver Raw Water System-Part 1
• Water Supply Pro - Doc Type: Report/Study

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RESULTS OF STUDIES

27

On each of the two figures there is depicted from the top
to the bottom a number of graphs indicating respectively: undi-
verted Moffat System supplies, Gross Reservoir content, exchange
potential to South Platte reservoirs, Dillon Reservoir content, and
South Platte reservoirs content,

Referring to Figure 4 it may be noted that the amount of
undiverted Moffat Tunnel system supplies would be nominal
occurring in only six years of the entire period, Such supplies
would be undivertible because of Gross Reservoir's being full.

The graph indicating the exchange potential to the South
Platte reservoirs represents the amount of Blue River water that
could be stored in South Platte reservoirs by exchange should
capacity be available and should there be that much Blue River
water available to bring to the South Platte,

The graph indicating the Dillon Reservoir content shows the
content of the reservoir after the reservoir had been completed
and the Harold D, Roberts Tunnel had gone into operation, it
being assumed that the Dillon Reservoir would have a live
capacity of only 18,200 acre-feet, Over-riding the 18,200 acre-
foot cantents of the reservoir are a number of bars which depict
the total undiverted Blue River supplies, or water which under
this operation would spill from Dillon Reservoir, A portion of these
bars is hatched and a portion is solid black, The black portion of
the bars represents the amount of undiverted Blue River suppl ies
which could be brought to the South Platte and in some cases
used directly in the system or exchanged to South Platte reservoirs
if unfilled storage capacity was available at that time, It may
be noted, by comparing the undivertible Blue River supplies
represented by the black bars with the contents of South Platte
reservoirs shown on the lower graph, that at times portions of
such undiverted supplies could have been stored by exchange to
South Platte reservoirs, To do so, however, would only result in
spilling of South Platte reservoirs a few months later, The opera-
tion depicted on Figures 4 and 5 assumes the exercising of short-
time forecasting to minimize spill of South Platte reservoirs.

The hatched portion of undiverted Blue River supplies on
the graph showing the Dillon Reservoir operation represents