. Bulletin of the Department of Agriculture. Agriculture; Agriculture. •iv^lMka. Contribution from the Bureau of Public Roads THOS. H. MACDONALD, Chief. Washington, D. C. PROFESSIONAL PAPER June 7, 1920 THE FLOW OF WATER IN DREDGED DRAINAGE THE RESULTS OF EXPERIMENTS TO DETERMINE THE ROUGHNESS COEFFICIENT, n, IN KUTTER'S FORMULA. By C. E. Ramser, Senior Drainage Engineer. CONTENTS. Page. Introduction 1 Field measurements 2 Computations 4 Tabulated results 6 Description of channels 7 Accuracy of results 9 Description of experiments 9 Experiments in Lee County, Miss 9 Experiments in Bolivar
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. •iv^lMka. Contribution from the Bureau of Public Roads THOS. H. MACDONALD, Chief. Washington, D. C. PROFESSIONAL PAPER June 7, 1920 THE FLOW OF WATER IN DREDGED DRAINAGE THE RESULTS OF EXPERIMENTS TO DETERMINE THE ROUGHNESS COEFFICIENT, n, IN KUTTER'S FORMULA. By C. E. Ramser, Senior Drainage Engineer. CONTENTS. Page. Introduction 1 Field measurements 2 Computations 4 Tabulated results 6 Description of channels 7 Accuracy of results 9 Description of experiments 9 Experiments in Lee County, Miss 9 Experiments in Bolivar County, 17 Page. Description of experiments—Continued. Experiments in western Tennessee 24 Experiments in western Iowa 36 Experiments in North Carolina 45 Experiments in Florida 51 Variation of n with stage 58 Application of results 58 Conclusions 59 INTRODUCTION. Kutter's formula is generally accepted by engineers as being the most satisfactory formula in use for computing the flow of water in open channels. After a thorough and unbiased study of all known formulas for computing the flow in open channels, engineers of the Miami Conservancy District conclude that " Although the Kutter formula is not ideal it is the best equation available at the present ; * The results obtained by the use of this formula are, how- ever, affected to such a degree by the coefficient of roughness, n, that the selection of the correct value for this factor is a matter of the highest importance. The series of experiments described and sum- marized in the following pages were made for the purpose of deter- mining just what values of n properly apply to the various conditions of channel, and the endeavor has been made to present this informa- tion in the form that will be of the most practical value to engineers charged with the design of drainage channels or the computation of the discharge capacity of existing channels. 1 The Maimi Conservancy District, Technical Reports,
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