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o " , .. ..... SU~RY OF FINDINGS ~ Municipal and industrial water uses included in this appendix are domestic, manufacturing, livestock, governmental, commercial and related uses. In the Lower Colorado Region municipal and in- dustrial water withdrawal requirements were 463,800 acre-feet in 1965. The water depletion requirement for these uses was 203,700 acre-feet or 44 percent of the withdrawal requirement. The 2020 municipal and industrial withdrawals and depletion will require in- creases of 2,380,100 and 972,500 acre-feet per year, respectively. A 270 percent increase in population between the years 1965 and 2020, a fifteenfold increase in the value of manufacturing output, a fourteenfold increase in economic activity in the Trade and Services sectors, and rising water-use rates by rural residents are reasons for the growth of municipal and industrial water requirements. The increased municipal and industrial water needs of the Region could be met by developing authorized multi-purpose projects and ground water reserves, transferring irrigation water to tirban uses, desalination of brackish supplies, wastewater reclamation and reuse, improved water management practices, and augmentation by importation from outside ,the Region. Availability of future municipal and in- dustrial water supplies of suitable quality is predicated upon imple- mentation of salinity improvement programs and adequate municipal and industrial wastewater treatment. Total capital costs for development and treatment are projected to, be $109.5, $178.9 and $139.6 million for the 1965-1980, 1980-2000 and 2000-2020 time frames, respectively. Included are the cost of ten desalting plants varying in size from 0..5 to 100 million gallons per day, surface water development by government agencies, develop- ment of ground water reserves, a small importation from the Upper Colorado Region, and water treatment plants to treat the total pro- jected requirements. Costs of distribution systems from the treatment plant to the consumer are not included. Costs of federal mul ti- purpose projects that have a municipal and industrial water supply allocation, such as the Central Arizona Project, are also not in- cluded. Multi-purpose project costs are given in the General Program and Alternatives Appendix. The municipal and industrial water demands in each of the three subregions were developed by correlating economic sectoral water use with the economic and demographic characteristics. Water- use coefficients, both withdrawal and depletion, were used to con- vert the economic and demographic data to municipal and industrial water demands. These coefficients were defined as gallons of water i