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<br />, <br />; <br /> <br /> <br />PREFACE <br /> <br />SUPPLEMENT B <br /> <br />HYDRAULICS <br /> <br />This supplement expands and augments subsection 4,4 of the <br />Hydraulics Section of the'Engineering Handbook, <br /> <br />The objective of Supplement B is to present a systematic pro- , <br />cedure for the estimation of n values for use in hydraulic computa- <br />tions associated with natural streams, floodways and drainage channels, <br /> <br />This method of estimating roughness coefficients was' developed by <br />Woody L. Cowan, Mrs, Vivian Edwards typed the manuscript. <br /> <br />August 1, 1956 <br /> <br />f:l <br />