PUB00114

• Year: 1997
• Title: Arkansas Groundwater Users Association - 1997 Plan Year Arkansas River Replacement Plan
• CWCB Section: Stream & Lake Protection
• Author: Rocky Mountain Consultants, Inc.
• Description: Application for plan to divert tributary groundwater in the Arkansas River Basin, Colorado
• Publications - Doc Type: Historical

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The State Engineer has permitted AGUA to claim a 60.6 percent replacement credit on
shares used for augmentation purposes. Thus, subject to modifications as described below, AGUA
will claim a 60.6 percent replacement credit for water returned to the Arkansas River as measured at
the augmentation station. Credits will only be claimed during the period of March 16 through
November 14. No credits will be claimed in this plan during the winter storage season of November
15 through March 15.

The proposed operation of the Excelsior Ditch for replacement purposes was negotiated

between Mr. Dick Evans, owner and representative of the Excelsior Ditch shares, and the Division

Engineer's Office. Two scenarios are envisioned and provisions for determining the appropriate

replacement credit in each case are proposed, as follows:

Case I:

If monthly augmentation releases (V RET)' the volume of water released from the ditch
to the Arkansas River through the augmentation station, are less than or equal to the
theoretical augmentation diversions (V,J, where V A is 35.61 percent of the total
amount diverted into the ditch during the month 01 DlV)' the augmentation credit is
equal to 60.6 percent ofVRET.

Case 2:

If monthly augmentation releases (V RET)' are greater than the theoretical
augmentation diversions (V,J, then the total possible augmentation credit is equal to
60.6 percent of V A> however, the actual credit is limited to 60.6 percent of35.6l
percent of the historical average diversions for that month (V HIST)' Values for V HIST
are the pre-Compact average monthly diversions for each month during the period of
March through November. The values are shown in the upper portion of Table 10.

For purposes of evaluation of this plan, the Excelsior Ditch credits estimated to be available
during the 1997 plan year are based on 60.6 percent of 35_61 percent of the 1908-1985 average
historical monthly diversions as shown in the lower portion of Table 10. However, in determining
the replacements available to AGUA in the event of Case 2 above, the credit will be capped at 60.6
percent of35.61 percent of the pre-Compact average monthly diversions as shown in the upper
portion of Table 10.

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