1. Determination of water-conducting coefficient(T) of water-bearing bedUnder the same condition, the thicker water-bearing bed and the coarsergrain are accompanied by higher apparent lateral resistance (R_t),representedby R_t = Q₂·h₂; moreover, the water-conducting coefficient(T) are also dependenton the thickness and structure of the water-bearing bed, as exprassed by T=K·h. It might therefore be seen that positive correlationship exists between Tand R_t, and that the water-conducting coefficients can be evaluated by drawingthe T-R_t correlation curve.R_t was determined by interpretation of field electrical sounding curves;Water-conducting coefficients of the aquifer were obtained on the basis of datafrom seven known withdrawal holes; Through a comparison between the calcu-lated T values and R_t values, the T-R_t correlation curves (being straight lineshere)of Q₃ sand-pebble layer and Q₂ argillaceous pebble layer have been estab-lished respectively. Calculation shows that T-R_t correlation coefficient of Q₃ layer is y=0.964, suggesting the reliability of the correlation curve. On thebasis of T-R_t correlationship, a map of "distribution of water-conducting coeffi-cients" has been compiled, and some parameters have been figured out:permea-tion coefficient of Q₃ layer is 80—120 m/day, R_t/T 2.13—2.66, K of Q₂ layer40—50 m/day, and R_t/T 5—8.2. The evaluation of effective porosity(ψ)of water-bearing bedThe formula ρ_s=ψ^-mS^-nρ_w has been used for this purpose. In the field, elect-rical sounding technique was adopted to evaluate the resistivity(ρ_s)of water-be-aring beds in 11 known drill holes. The water samples collected in the field wereanalysed at laboratory. According to the diagram of relationship between strati-graphic water (ρ_w)and mineralization intensity (c) at 16℃,ρ_w value for eachdrill hole was determined; taking m=1.5,ψ value for each hole was evaluatedwith the above formula.values of Q₃ layer range from 0.1796 to 0.3444,mostly 0.20—0.25, which are in agreement with the ψ value (0.25) obtained inlaboratory, and are also close to the empirical value(0. 23—0. 26) of gravity watersupply.