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<br />24 <br /> <br />o <br />....:i <br />U1 <br />'-1 <br /> <br />Other land uses <br /> <br />The other land uses are for the purpose of this study assumed <br /> <br />to use water at their potential rate. Phreatophytes would only be <br /> <br />affected when large changes in the water table occur. <br /> <br />. <br /> <br />Subroutine GWMOD <br /> <br />The scope of the subroutine GWMOD is to simply provide an <br /> <br />independent computational procedure to substantiate the estimates of <br /> <br />ground water outflow arrived at in subroutine WATER. Even though <br /> <br />considerable effort has been made to observe the subsurface variables, <br /> <br />the data obtained in the test area do not warrant a non-steady state <br /> <br />ground water solution. The computational procedure is illustrated <br /> <br />in the flowchart shown in Fig. 7, and variable definition is listed in <br /> <br />Appendix A. <br /> <br />The theory behind the model is analogous to a prismatic channel <br /> <br />with a large boulder in it. As long as the channel remains completely <br /> <br />prismatic, the discharge past the boulder results in a unique water <br /> <br />mark elevation on the face of the rock. The as sumptions made con- <br /> <br />cerning the subroutine GWMOD's operation are similar to the open <br /> <br />channel problem and include: <br /> <br />(1) By taking the subsurface properties of hydraulic conductiv- <br /> <br />ity and strata depths at a fairly representative point in the <br /> <br />area near the outflow, an imaginary "screen door" <br />