Quantitative Evaluation of Well characteristics by Step Drawdown Test and Cluster Analysis of Discharge and Water Level in Shallow Wells

Optimization for discharge management of shallow well groups (1)

Abstract

For management of groundwater in wide basins, we should couple the analysis of groundwater dynamics with combinational optimization to deal with constrict conditions such as water right. In this paper, a new evaluation method of hydrodynamic characteristics (safe yield capacity etc.) of shallow wells was proposed by applying the cluster analysis to the yield and water level in the wells (diameter: 3-5m, depth: 8-15m) located on the mid-and lowerpart of alluvial fan. The method was verified to estimate the critical yield of each well by using results of step drawdown test conducted over ten times a well and data of discharge and water level obtained in 1985 (usual year), 1993 (rainy year) and 1994 (thought year). This quantitative evaluation is useful, when deciding the distribution of discharge in the well groups in the water supply control scheduling.