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Modeling Results for <br />Colorado River Basin States' Modeling of <br />Colorado River and Reservoir Management Strategies <br />2.0 Description of Specific Strategies <br />As mentioned earlier, many operational strategies were studied during this <br />process. This section describes the key strategies that were analyzed with regards <br />to Lower Basin shortages and coordinated management between the Upper and <br />Lower Basins. <br />2.1 Lower Basin Shortage <br />2.1.1 Step Shortage <br />The original Step Shortage strategy (Step Shortage) was developed as part of a <br />collaborative in -state process in Arizona to provide a recommendation for <br />Colorado River shortage criteria. The basic concept of Step Shortage is to specify <br />Lower Basin shortages based on different Lake Mead elevations which occur at <br />the beginning of the calendar year. The shortage amount is the amount of <br />reductions applied to releases from Lake Mead. There is no absolute protection of <br />specific elevations in Lake Mead under this strategy; therefore, the maximum <br />shortage amount in any year is 600 KAF, regardless of how low the water surface <br />elevation of Lake Mead is projected to be. <br />Three revisions to Step Shortage were also studied. These revisions and the <br />original Step Shortage strategy are illustrated in Figure 2 -1. <br />Figure 2 -1 <br />Lake Mead Step Shortage <br />(Elevation in feet; Volume in thousand acre -feet) <br />Mead <br />Lower Basin Shortage Strategy <br />Mead <br />Elevation <br />Step Shortage Step Shortage rev1 Step Shortage rev2 Step Shortage rev3 <br />Elevation <br />1220 <br />no shortage <br />no shortage <br />no shortage <br />no shortage <br />1220 <br />1100 <br />— — — — — — — — — — — — — <br />— — — — — — — — — — — — — <br />------ - - - --- <br />1100 <br />400 <br />400 <br />400 <br />1075 <br />— — — — — — — — — — — — — <br />— — — — — — — — — — — — — <br />— — — — — — — — — — — — — <br />----- - --- - -- <br />1075 <br />400 <br />500 <br />400 <br />500 <br />1050 <br />— — — — — — — — — — — — — <br />------- - - - - - --- <br />— — — — — — — — — — — — — <br />— — — — — — — — — — — — — <br />1050 <br />500 <br />600 <br />500 <br />500 <br />1025 <br />— — — — — — — — — — — — — <br />— — — — — — — — — — — — — <br />-- ---- - - - - -- <br />1025 <br />600 <br />600 <br />600 <br />1000 <br />1000 <br />895 <br />895 <br />