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I I I I I I I I I I I I I I I I I I I -n 1"-, .0:; t:'~ ',,, (il.Li,;_,:".j;..n imp 1 ementat ion, potent i a 1 scope of app 1 i cat ion, deg rees of envi ronmenta 1 , operational or institutional constraints and other considerations. A summary listing of major categories of water supply augmentation methods inventoried and assessed in this study element follows: o Precipitation augmentation and management o Land treatments and modifications o Vegetative management practices o Evapotranspiration management and reduction o Conjunctive surface/ground water use and management INTRODUCTION Regional Study Element B-5, as presented in this report, provided the necessary assessment of local water supply augmentation methods and poten- tials, applicable to the High Plains Study region, for regional consistency among the six study states in addressing alternative water Management Strategy Three (MS-3). Management Strategy Three was included in the original design to provide a structured element for examining the potential for local water supply aug- mentation. The results of this assessment indicate that while several augmen- tation technologies offer potential benefits in local areas, those for which some information and experience is available do not promise any relatively significant breakthroughs towards meeting long-range regional irrigation water requirements. Most of those methods that might result in significant future augmentation are as yet largely unproven. Much more research and development. wi 11 be necessary before thei r potenti a1 can be fully assessed. Therefore, the B-5 technologies studied were not analyzed by the states through their LP and I/O research, except to the extent that presently applied methods of aug- mentation were included in the Baseline and water demand management strategy analyses. 1