Abstract:

On the basis of analyzing the hydrogeological and Karst feature of Sifangjing Karst spring watershed, we employed employed regression analysis and dry-season runoff modulus to calculate the natural recharge and recoverable resources according to long-time observations of springs in serious drought of 2009-2010. The results are 15.226 million m³/a and 5.8571 million m³/a, respectively. We also calculated the natural discharge to be 15.338 million m³/a by using runoff modulus and compared it with the assessment result from regression analysis. It’s found that regression analysis has higher reliability .

Key words: groundwater resources, regression analysis, Karst, Zhijin county of Guizhou Province