Report Number: 41
Year: 1983

Feasibility Study of Developing Valley-Fill Aquifers for Village Water Supplies in Southern Guam

Villages located in southern Guam occasionally experience domestic water supply shortages that affect both the home dweller and the farmer. Municipal water supplies are provided by the island-wide distribution system. Water is obtained from well fields which tap the complex Ghyben-Herzberg lens beneath the northern limestone plateau and is transported at considerable cost. If alternative sources of freshwater can be located near the centers of high demand, the energy costs of pumping water long distances would be lowered, the reliability of the distribution system would be improved, the quantity of water extracted from the northern lens would be reduced, and lastly the village would become more self-sufficient in terms of water supply.

Potential sources for domestic use have been identified near the outflow of the Inarajan River. Two water-bearing units of alluvium and shallow-water marine sediments overlie a partially weathered volcanic basement. From the results of this study, it appears feasible to develop the groundwater resource, at least initially, on a limited scale. The quality of the product water is such that it could be used directly for agricultural purposes.

Jerry F. Ayers
Russell N. Clayshulte