Abstract:Based on the analysis of topographic and geological conditions along the west route of South-to-North Water Transfer Project,the groundwater runoff modulus and the rock permeability properties are studied. Firstly,an integrated method for evaluating groundwater runoff modulus of non-karst plateau region is presented,in which the hydrological map analysis is mainly applied,combined with remote sensing interpretation and the analysis of field flow data obtained from the survey of regional springs and streams. In the analysis of hydrological map,it is emphasized that the influences of rainfall and snow melting should be considered during map being cut. In the calculation of groundwater runoff modulus according to field survey data of stream flow,a seasonal reduction coefficient is proposed. The research results indicate that the groundwater runoff modulus within the hydrogeological element of Jiaqu River is largest whereas those in the other elements have similar values. Secondly,the permeability of rock mass is also studied in terms of data analysis of field water pressure test and isotope trace test. In dealing with test data,a method of omitting unreasonable data is suggested,because these kinds of data are possibly caused by poor seal of orifice or by the occurrence of the faults passed across borehole. A negative exponential relationship describing the permeability variation with depth is developed. The results of the above parameters are finally applied to the prediction of water quantities flowing into tunnel.