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0013\10 things as the preservation of open space, the opportunity for a rural farm lifestyle, preservation of the family farm, and concern for the vitality of rural towns. Since this set of values is so elusive, some difficulty was encountered in finding a suitable way to depict impacts in this regard. The best measure appears to be simply total irrigated average. The difficulty with this impact category is that it probably does not adequately portray the social or cultural values associated with the family farm, the opportunity for a rural lifestyle, etc. For example, even if all water now used in irrigated agriculture remains in that use, there is no certainty that the number of family farms will remain the same, or that rural towns will continue to be socially and economically viable. Acres of Irrigated lawns and gardens, per capita. It is obvious that Coloradans value lawns, parks&' gardens, allof.trich are the direct result of irrigation. It is therefore appropriate to include as an impact category the acresof,irrig;lted urban land (lawns, parks and gardens) per capita. It should be noted at this point that there are other values, such as providing a safe and reliable supply of water for public health purposes (drinking, cooking, washing, etc.) that are directly affected by the provision of municipal water supplies. However, the water study has made no attempt to measure impacts on these values for two reasons. First, it was thought that the pre-eminent need for water supplies suf- ficient to meet public health, requirements would never be seriously questioned. Thus, the water study assumes that there is no inclination to trade these values off against other values, and thus no merit in quantifying municipal water-related values other than irrigation for lawns and gardens. Secondly, in-house water use for things such as /', Ie r