Sam Ziemann From - Region of Waterloo

CALCULATION OF SPECIFIC CAPACITY FROM STEP TEST DATADrawdown Discharge Specific SpecificStep S Rate Drawdown CapacityQ S/Q Q/S(metres) (L/s) (m/(L/s)) (L/s/m)0 0 01 0.86 5.0 0.17 5.82 1.76 10.0 0.18 5.73 2.85 15.0 0.19 5.34 4.07 20.0 0.20 4.9CALCULATION OF THEORETICAL SPECIFIC CAPACITY BASED ON LINEAR GRAPHICAL RELATIONSHIPSpecific Drawdown = S/Q = cQ + bwhere:c = slope of Specific Drawdown (Y) vs Discharge Rate (X)Q = Discharge Rateb = "Y-intercept" of Discharge (X) vs. Specific Drawdown (Y) lineS = Drawdown[m/(L/s)][m/(L/s)^2][L/s][m/(L/s)][m]b= 0.158 [m/(L/s)]c= 0.002 [m/(L/s)^2]Discharge CalculatedRateDrawdownQ S(L/s)(m)5.0 0.810.0 1.815.0 2.920.0 4.0AVAILABLE DRAWDOWN18.3 m(Available drawdown = the static level (mBGS) - the depth to the top of screen or bedrock surface (mBGS))MAXIMUM RATE BASED ON AVAILABLE DRAWDOWN62.5 L/SEC825 IGPMClient/ProjectHydrogeological AssessmentStrange Street Water Supply Class EA UpdateRegional Municipality of WaterlooTable No.3TitleCalculation of Potential Well Capacity