Population growths are increasing the demand for water. This can cause an imbalance of water availability to fulfill domestic water demand. Therefore, it is necessary to analyze the water availability and water demand so that water resources are maintained and can fulfill the community needs in the present and future. This research aims to analyze the water availability and domestic water demand in Semarang Regency. The methods consist of calculating monthly rainfall, calculating water balance using F. J Mock model, calculating the water demand regarding to the water availability, and calculating how much water can be obtained from rain harvesting. The results show the highest annual water availability in Semarang Regency is Pringapus district 48,559,764.55 m3/year, while the the lowest is Kaliwungu district 17,352,024.13 m3/year. The highest domestic water demand are in West Ungaran district, East Ungaran district, and Bergas district, while the lowest are in Bancak and Kaliwungu district. The total water demand is 6% of the total water availability, means there is no water deficit in Semarang Regency. The total volume of rainwater harvested is 120,163,412 m3/year which means the volume of rainwater harvested in one year can fulfill the domestic water demand in Semarang Regency.
Donorejo is one of the villages in Purworejo Regency, Central Java, Indonesia. This village is a unique place and famous for its tourism site, namely Goa Seplawan. Nevertheless, this tourist attraction has not provided significant income for local revenue, as the poverty rate in Donorejo is still quite high. The Office of Community Empowerment, Villages, Population and Civil Registry of Central Java stated that only 1, 630 residents of Donorejo were categorized as prosperous in their economy. It indicated that almost 50% of the population in Donorejo has not been economically prosperous and the development of Donorejo has not implemented optimally. To find out the proper development strategy, the Analytical Hierarchy Process was used as a method based on stakeholder assessment in the Donorejo. The used priorities were based on four aspects, namely human resource development, regional promotion, development of supporting infrastructure, and public services. The obtained results indicated that development of supporting infrastructure is a priority for the development of Donorejo. This outcome can be used as a reference to optimize the village development.
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