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<br />C. Future Studies <br />This guide is designed to meet a current, ever-pressing demand that <br />the Federal Government develop a coherent set of procedures for accurately <br />defining flood potentials as needed in programs of flood damage abatement. <br />Much additional study and data are required before the twin goals of <br />accuracy and consistency will be obtained. It is hoped that this guide <br />contributes to this effort by defining the essential elements of a <br />coherent set of procedures for flood frequency determination. Although <br />selection of the analytical procedures to be used in each step or element <br />of the analysis has been carefully made based upon a review of the <br />literature, the considerable practical experience of Work Group members, <br />and special studies conducted to aid in the selection process, the need <br />for additonal studies is recognized. Following is a list of some additional <br />needed studies indentified by the Work Group: <br />1. Selection of distribution and fitting procedures <br />(a) Continued study of alternative distributions and <br />fitting procedures is believed warranted. <br />(b) Initially the Work Group had expected to find that <br />the proper distribution for a watershed would vary <br />depending upon watershed and hydrometeorological <br />conditions. Time did not permit exploration of <br />this idea. <br />(c) More adequate criteria are needed for selection <br />of a distribution. <br />(d) Development of techniques for evaluating <br />homogeneity of series is needed. <br />2. The identification and treatment of mixed distributions. <br />3. The treatment of outliers both as to identification and <br />computational procedures. <br />4. Alternative procedures for treating historic data. <br />5. More adequate computation procedures for confidence limits <br />to the Pearson III distribution. <br />6. Procedures to incorporate flood estimates from precipitation <br />into frequency analysis. <br /> <br />25 <br />