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warmer than the water from ground water recharge from agriculture, and may affect the stream flora and fauna either negatively or positively. The costs of municipal waste cleanup and control of salinity levels may be increased in some areas and reduced in others. The timing, water level, temperature, and quality of return flows affect fish and wildlife, quality of water available to downstream users, recreational Use of instream flows, and the level of erosion affecting the river condition. When water is transferred from agricultural land to other uses, the land taken out of production may pose problems for adjacent land. Blowing dust and weeds threaten adjacent land, requiring additional expenditures to control them. Legislation passed by the 1992 Colorado legislature requires court decrees to include revegetation plans. Previous decrees have included such plans. Aurora is reported to be having difficulty in revegetating some of the land taken out of production as a result of purchases of water in the lower Arkansas Valley. The provisions of Aurora's decree and the measures taken by the city to meet its revegetation obligation are likely to provide a basis for other such decrees. Alternative Management Approaches Water law varies between states. Colorado may be able to glean some ideas from other states, ideas that will help the state to better position itself for the era of water reallocation. The "no inj~" rule is the'only universal restriction on water transfers.10 Most western states other than Colorado initiate water right changes through an administrative procedure, using the court as a forum for appeal. A few states have laws restricting the movement of water from one watershed to another, applicable to new appropriations and to changes in established water rights. California has a law reserving to the area-of- origin all water necessary for future development, but it provides no procedures or criteria for doing so. Some of the issues and interests described above may be handled by other states under their laws requiring that appropriations of water not be contrary to the "public interest" or the "public welfare."ll Most western states have some kind of public interest review requirement. Colorado dOes not have a this kind of requirement. Colorado has an instream flow protection program, as do most western states. These programs vary considerably. The Colorado Water Conservation Board holds instream water rights to protect cold-water fisheries. Some states reserve from appropriation water in specific streams. Arizona and Alaska are the only two 14