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results of the hydraulic analysis are presented in Table 3.2. The <br />• mean and standard deviation of the values determined for channel <br />slope, velocity and boundary shear stress have also been tabulated for <br />the existing and approved condition. These results indicate very <br />little variation in hydraulic parameters. A visual indication of the <br />impact upon velocity due to the existing versus approved Channel <br />conditions is presented in Figure 3.2. This figure further confirms <br />the minimal impact resulting from the variation between the existing <br />and approved channels. <br />3.3. Channel Stability Comparison <br />Several methods have been developed to aid in the design of stable <br />earthen channels and estimate their erosion potential. These methods <br />• encompass both static and dynamic equilibrium approaches. 4ssessing <br />the stability of earthen channels utilizing moveable boundary <br />techniques (dynamic equilibrium) is largely restricted to channels <br />composed of sand and gravel material, gentle slopes and low values of <br />the Froud Number (Fr <0.3 for modified regime approach). <br />Consequently, these techniques are not applicable to a stability <br />analysis of the channels in the Eckman Park Mine. <br />Two static equilibrium methods commonly used are the tractive <br />force method and permissible velocity. The tractive force is the <br />force created by the movement of the water over the wetted perimeter <br />of the channel. Sediment movement is initiated by this force. The <br />analysis consists of calculating the frictional forces at the earth- <br /> <br />33 <br />