Water Quantity and Quality from Flowing Wells in the Kurobe River Alluvial Fan

Abstract

 Long-term and regular monitoring of the groundwater environment is usually is extremely important to manage groundwater appropriately. Monthly regular groundwater observations and analyses had been conducted during the five years of April 2011 - March 2016 to clarify medium-term and long term and seasonal change in discharge and water quality of flowing wells in the Kurobe River alluvial fan.

 Results show that both of pH and electric conductivity of all flowing wells were almost constant through the five years. Groundwater temperatures and flowing discharges of all flowing wells exhibited seasonal changes. Dissolved ions of flowing wells at the edge of fan increased as they left the Kurobe River. Moreover, the characters of dissolved ions of flowing wells between the edge and the top of fan differed greatlty.

 Future observations must be made for appropriate groundwater environment management in the Kurobe River alluvial fan. However, this study revealed some water quality items that show changes even for short periods of 2–3 months. This fact can facilitate planning and save labor related to observations.