Various parameters needed for quantitative assessment of ground water resources and the methods of acquiring these parameters were considered in this study. Based on applicability and cost, the aquifer test method for acquiring parameters was selected as the basis for designing networks. Precipitation gauging stations, streamflow gauging stations, evaporation gauging stations, and observation well networks are designed for Aleydegi Plain, Ethiopia, as a test for the design. The design requires establishment of five precipitation gauging stations, 15 streamflow gauging stations, two evaporation gauging stations, and more than 100 observation wells. Instruments needed for each network are selected based on cost and availability. The capital cost of establishing these networks for assessing the ground water resources is estimated to give an idea of the capital requirements for assessment of ground water resources.