WSP05931

• File Number: 8200.766
• Description: Gunnison River General Publications-Correspondence-Reports
• State: CO
• Basin: Gunnison
• Water Division: 4
• Date: 4/21/1994
• Author: Unknown
• Title: Gunnison Basin Planning Model Inflow Review - Discussions - Recommendations - Unresolved Issues
• Water Supply Pro - Doc Type: Report/Study

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Draft: April 21, 1994

Crystal Creek Inflow Representation:

ENFL7 flow estimates were derived as part of the
expanded network flow development effort. This inflow
represents virgin inflows at the Crystal Creek nr. Maher
gage (09127500) -- supplies available to Cattleman,
Fruitland, Dyer Fork, and Meek Divide ditch diversions

Review indicated that this inflow should be included
in INFL5 (flow gains between Morrow Point and Crystal
Dam); as such, this inflow is also a component of the
natural flow at the Gunnison River at Crystal Dam site;

For proper representation, ENFL7 should be derived as
part of INFL5

Inspection of INFL5 and ENFL7 flow values show long
term WY 52-90 yields of 13,000 and 24,800 acre feet,
respectively (ENFL7 yield estimate greater than INFL5 -
see Attachment ~)

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Further review indicated that adjustments for
diversions out of the Crystal Ck. basin to the Smith
Fk./Iron Ck. basin by Cattleman's, Fruitland, Dyer Fork,
and Meek Divide ditches had not been considered in the
derivation of Gunnison River at Crystal Dam (and
consequently, INFL5) natural flow estimates.

'- The average annual diversions from these four ditches
for the WY 52-90 period is estimated to be approximately
20,000 acre feet (tabulation in Attachment ~)

Estimated ditch diversions were added to initial
INFL5 values to obtain revised estimates for this inflow,
with an average WY52-90 yield of 32,900 acre feet
(tabulation in Attachment ~) ,

ENFL7 inflows (Crystal Ck. nr Maher) were replaced by
INFL5A, derived as a proportion of revised INFL5 (with
the initial yield estimate of 24,800 acre feet retained -
- see tabulation in Attachment ~)

INFL5B, representing the remainder of Morrow Point to
Crystal inflows was obtained by difference:
INFL5 - INFL5A = INFL5B ( tabulation in Attachment ~)

- these revisions require that ditch diversion estimates
added to derive revised INFL5 values be added to the

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