FLOOD10327

• County: Eagle
• Community: Eagle
• Stream Name: Eagle River
• Title: Eagle River Watershed Plan
• Date: 1/1/1996
• Prepared For: Eagle Community and Eagle County
• Prepared By: National Park Service
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

the point of diversion. This basically reduces
the intensity of spring melt flows and does
not affect in-basin uses. It should be noted
that high spring flows are important for
"flushing" sediment out of the river in order
to maintain optimal aquatic habitat (Calow,
1992). However it has not yet been deter-
mined how much of a "flushing" effect is
needed to maintain optimal habitat for
aquatic life in the Eagle River.

In-Basin (local) Use
In-basin water use consists of all water uses
that take water from the watershed for use
within the watershed. In-basin water users in
Eagle County divert water from the Eagle and
it's tributaries but unlike trans-basin users,
they typically return a significant portion of
the water diverted back to the Eagle River
watershed. Therefore, it is critical to look at
where, when, and how much water is divert-

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Figure 1. Conceptual Diagram of Eagle River Stream Flow

Average
Year

_ Natural (Undepleted)
Stream Flow

Dry
Year

1 1 Natural (Undepleted)
Stream Flow_
~ ~
0
Ii: Ii:
~ ~
..
In _ Existing In
... ...
0 Stream Flow 0
i i
0 0
~ ~

In-Basin
Depletion

_ Instream Flow
_ _ .- Deficit

o Ian. Feb. Mar. Apr. May IlDle July Aug. Sept. Oct. Nov. Dec.

...,...
.".
20 IIIMI

Existing _
Stream Flow

Minimum

Instream Flow/

----...... l
Instream Flow ~ "-
"'" - Deficit ~.

o Ian. Feb. Mar. Apr. May IlDle luly Aug. 5epL

......

oct. Noy. Dec.

Source: Eagle River Assembly Phase I Report, 1994