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3.2.4 Re-regulation within the District's System <br />For the basis of this study, it is assumed there will be the opportunity to use a <br />maximum of 4,000 ac-ft of the capacity in Johnson Lake within the CNPPID <br />system as re-regulation space for Program water in February, March, and <br />April. Re-regulation in the District's system is described in and subject to the <br />EA Bypass Agreement of Attachment 5, Section 1 of the Program Document <br />Water Plan. <br />3.2.5 Limitations in Capacities and Operational Flexibilities <br />System limitations and capacities will play a crucial role in the ability to move <br />Program water downstream to the critical habitat and will also impact the <br />required volume of water. Some of these limitations such as the channel <br />capacities and diversion capacities are physical constraints. To modify these <br />constraints would require design and construction activities similar to the <br />modification of the North Platte "choke point". Other limitations such as <br />ramping rates appear to be more institutional in nature, though founded on the <br />basis of potential physical impacts and costs if violated. Examples of these <br />limitations include the ramp up limitation on the North Platte River in order to <br />limit damage to diversion structures and to limit debris mobilization, and the <br />limit on ramping in the Sutherland Canal to avoid canal wall breaching, <br />reservoir bank sloughing, and ultimately disruptions to deliveries for irrigation <br />and power supplies. To the extent that these limitations can be adjusted or <br />mitigated by the Program is a potential benefit to reducing the total volume of <br />water required to achieve the flow targets considered in this WMS. The costs <br />of making these adjustments will need to be compared to the cost to the <br />Program in terms of water and other liabilities. The tools developed in this <br />study have been designed to facilitate the evaluation of the sensitivity of <br />achieving the target flows based on these capacities and limitations. <br />B044.E Page 13 of 58 January 29, 2008 <br />PRRIP - Draft Water Management Study, Phase I