Comparison of soil saturated hydraulic conductivity under inverse auger hole and shallow well pump methods

Hydraulic conductivity is one of the most important soil hydrodynamic Characteristics that is required to evaluate of groundwater flow and drainage studies and calculate of subsurface drainage spacing. The main objective of this study was to compare the saturated hydraulic conductivity measured using Inversed Auger Hole and Shallow Well Pump in Test Methods and also Determine the relationship between hydraulic conductivity obtained from these two methods are based on mathematical models (Linear, logarithmic, inverse, quadratic, cubic, compound, power, S, growth and exponential) have been compared. Shallow Well Pump in Test Method due to practical constraints, is less used. The measuring of hydraulic conductivity in Inversed Auger Hole method carrying out with a shorter period of time compared to Shallow Well Pump in Test Method. This method is currently the most commonly used methods. In this research, 30 wells were drilled at area of 2000 hectares of Saghez region to determine the saturated hydraulic conductivity. Inversed Auger Hole method was conducted for three consecutive times and then carried out Shallow Well Pump in Test Method. Results showed that mean saturated hydraulic conductivity of Inversed Auger Hole method was 87% greater than the Shallow Well Pump in Test Method. Also, the results showed that cubic model to estimation of saturated hydraulic conductivity of Shallow Well Pump in Test Method based on Inversed Auger Hole method was the best model with 0.863 correlation coefficient and 0.256 Root mean square error (RMSE). It was found that the inverse model was the worst model.

Keywords:

hydraulic conductivity , Inversed Auger Hole and Shallow Well Pump in Test Method