Analysis of Groundwater Flow Velocity and Direction along the Zihe River in the Dawu water Source

In the observation wells installed along the Zihe River in the Dawu water source, the AquaVISION Colloidal Borescope produced by Geotech Company of the United States was used to measure the groundwater flow velocity along the Zihe River. We analyzed the measurement results based on the drilling information. The results showed that, (1)The groundwater flow velocity along the Zihe River in the Dawu water source area was between 56.798 and 122.599 m/d, and the average flow velocity was 95.380 m/d. The groundwater flow velocity of observation wells along the Zihe River was generally faster. The flow velocity of the SW447 well in the upstream of the Zihe River was the largest, and the average flow velocity was 122.599 m/d. The overall groundwater flow along the Weihe River flowed from south to north.(2)The control factors of groundwater flow velocity were mainly: large amount of water pumping, local geological structure, related hydrogeological conditions, etc.