2000 WY EA AOP - Laserfiche WebLink

Home Browse Search

2000 PROJECTED WATER SUPPLY During September 1999, Lake McConaughy was above the FERC regulatory capacity elevation that would become effective on October 1, 1999 (3260.0 ft MSL). Adjustments were made by CNPPID in September to decrease elevations to avoid exceeding the regulatory capacity restrictions. As a result, Lake McConaughy was not technically at regulatory capacity on October 1(the date the EA became effective). In a letter dated October 1, 1999, CNPPID requested concurrence from the Nebraska Department of Water Resources (DWR) that Lake McConaughy was, in effect, at capacity on October 1 and that 100,000 af be made available for use in the EA. On October 12, DWR concurred with CNPPID's conclusion, and the EA was set to 100,000 af as of October 1, 1999. In a letter dated November 23, 1999, CNPPID informed DWR that Lake McConaughy had been "effectively at capacity" from October 1, 1999 to November 22, 1999. On January 4, 2000, DWR concurred with this determination and indicated that the EA was considered to be set equal to 100,000 af as of November 22, 1999. It is assumed that the final record of accounting from DWR will show that the EA was equal to 100,000 af for each day from October 1, 1999 to November 22, 1999. The Districts provided the following predictions for SNI and Type-of-Year for the 2000 water year to the EA Manager on October 18, 1999. The SNI for October through March is used for calculating "Type-of-Yeaz" whereas the SNI for October through April is used in assigning contributions to the EA. The EA Manager will be notified by the Districts of any modification to this prediction that results in a change in the year type. Item SNI, October through March SNI, October through April Type-of-Year Prediction 289,200 af 315,800 af Wet The Districts' predicted in their 2000 Water Year Operations Plan that Lake McConaughy contents on March 31 will exceed 1.5 million acre-feet. In a letter dated December 9, 1999, the EA Manager was informed by CNPPID that the District's also predict that Lake McConaughy will fill during the months of March and April. 2000 RELEASE PLANS FOR THE EA Decision Conditions for EA Operations The Decision Tree (Figure 2) illustrates a chronologic progression of release periods and hydrologic and biologic conditions to be considered throughout the year for determining EA releases. The duration and quantity of water to be released will depend on historic and existing conditions, EA volume, and release priorities identified in this AOP. Because the 2000 water year is the first year of EA operations, a steep learning curve exists. The Decision Tree provides general guidelines for determining when EA releases will be made. These guidelines will be refined and changed as management of the EA progresses. EA AOP 3 January 31, 2000