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<br />001241 <br /> <br />4 <br /> <br />in the CSU data file using a Matrix Inversion Method for a digital <br />computer developed by Kavvas (1972). The different response times <br />were cross-correlated by Wilson in his investigation. The various <br />measures of the response time were classified into two main groups by <br />Schulz and Wilson (1972). The first classification was related to <br />measurements on the unit hydrograph which is derived from the observed <br />rainfall-runoff data set. The second classification of the response time <br />is obtained from measurements of overland flow slope and length and an <br />assumed surface roughness factor. These two classifications really go <br />back to the basic analytical approach used in obtaining the watershed <br />response function. Yevjevich et al. (1972) classified those analytical <br />procedures based on the unit hydrogra ph type of concept as a "black- bo x" <br />technique. <br />When basic physical laws are applied to the analysis of the problem <br />the term "gllelf-box" was used. Izzard's (1946) early work was a pioneering <br />effort in this direction. The application of the kinematic wave theory <br />is a contribution in the grey box technique, Kibler and Woo1hiser (1970). <br />When the kinematic wave theory can be applied without any reference to <br />empirical-type roughness factors, the "wWe-box" technique will evolve. <br />The results of the thesis investigation of Fawkes (1972) is a contribution <br />in this direction. <br />The application of the kinematic wave to a design problem requires <br />the ability to predict whether the overland flow regime will be laminar <br />or turbulent. ,Correia (1972) carried out dye tracing experiments on the <br />CSU Experimental Rainfall-Runoff Facility and found that during rainfall <br />impact the overland flow regime was turbulent. Schulz and Fawkes (1972) <br />presented a paper in which a diagram was given which would establish four <br />different overland flow regimes: <br />