Patterns in sequence of annual river flow and annual precipitation

CER63VMY74.Extract of publication no.63Includes bibliographical references

Rate of change of the peak for floods progressing along a channel

CER65VMY58.Presented at the International Association for Hydraulic Research, Eleventh International Congress, Leningrad, 1965

Unsteady free surface flow in an storm drain: general and analytical study

CER61VMY38.June 1961.Includes bibliographical references.This report represents an analytical investigation of unsteady free surface flow in a storm drain. As a preliminary general study its broad scope is the outline of problems, the selection of mathematical tools and procedures, and the elaboration of a general approach for further studies by hydraulic model and by digital computer investigations in order to develop a set of routing methods for storm drain floods. Each method of this set should be feasible to the particular conditions of data available of flood hydrographs and storm drain characteristics, as well as of precision of computation. The initial and boundary conditions, applications, and the general approach selected are briefly enumerated in the introduction. The two partial differential equations for unsteady flow are derived and discussed. These basic mathematical tools serve as the starting equations for the computation of all high-order approximations of unsteady flow. Characteristic curves are derived and discussed. The integration of differential equations by method of finite differences is treated in detail, with special attention given to boundary problems. The coefficients of differential equations are analyzed. Particular attention is given to geometric characteristics of conduit drains, to velocity distribution coefficients, to flow resistance and to lateral flows, in order to treat their functions which are introduced in the two partial differential equations. The initial and boundary data are analyzed: for flow before the storm flood enters the drain; for inflow hydrographs; for data of junction problems when main drains meet; for outflow conditions; and for data of general boundary conditions. The end of the report contains the specific aims of the future research program, methods and procedures to be used (especially hydraulic studies, digital computer studies and comparative studies for the results of these two procedures), significance and characteristics of the future research and finally the facilities either available now, or to be installed in the near future in order to enable the research program to be carried out.Sponsored by the U.S. Bureau of Public Roads, Division of Hydraulic Research

Application of surplus, deficit and range in hydrology, The

September 1965.Bibliography: page 69

Fluctuations of wet and dry years. Part II: Analysis by serial correlation

Includes bibliographical references

Fluctuations of wet and dry years: Part I: Research data assembly and mathematical models

Includes bibliographical references

Analytical study of local scour

CER62FMC26.Includes bibliographical references (page 20).Prepared for Bureau of Public Roads under contract CPR 11-7866.April 1962

Use of tracers in making accurate discharge measurement in pipelines, The

CER66RWF-VMY38.October 1966.Prepared under U.S. Bureau of Reclamation contract.The purpose of this investigation was to provide some field data for the diffusion of a soluble tracer (Rhodamine W-T) in pipes. Nine parameters were selected and their effect on tracer concentration distribution was studied. The most important parameters varied were: water discharge through the pipe, mixing distance and the injection probe geometry. The experiments were conducted in a 36-inch pipe line where it was possible to vary the rate of flow and mixing distance. Uniformity of the rate of dye injection was insured by the use of a Chemcon Model 1110 chemical proportioning pump which could be manually adjusted while a radial arm, some distance downstream from the injection point, could sample the solution at different positions in a cross-section. A Turner model 111 fluorometer constituted the detection device which combined the advantages of high sensitivity in dye detection, ruggedness and nearly complete independence from the power supply voltage. The degree of uniformity of mixing of the soluble tracer is represented by Cv, which is the coefficient of variation of the tracer concentration distribution. Values of Cv, calculated from the observed concentration data for each flow rate, were fitted by the function Cv = Ke^(αz) by the method of least squares, where z is the mixing distance and K and α are constants.Under contract D-293

Theory and experiments in the prediction of small watershed response: completion report

CER72-73EFS-VY13.December 1, 1972.Includes bibliographical references (pages 11-12).OWRR project no. B-064-COLO (CSU Project 31-1372-1632), period July 1, 1971 to June 30, 1972 and extended to December 31, 1972.The work upon which this report is based was supported (in part) by funds provided by the U. S. Department of Interior, Office of Water Resources Research as authorized by the Water Resources Research Act of 1964 and pursuant to Grant Agreement No. 14-31-0001-3565.Circulating copy deaccessioned 2020.The flood response of a small watershed to flood producing rainfall was investigated in several ways. First flood hydrographs measured on small pristine watersheds were assembled along with the causal rainfall, antecedent rainfall, and a number of physiographic parameters of the watershed. Research has verified the validity of the application of the kinematic wave theory for computing the hydrograph of runoff from small watersheds. Research was carried out on deriving unit hydrographs from observed rainfall and runoff. A study was made of correlation of various methods of defining the response time of a watershed. A low pass filter method was used to remove oscillations from some of the derived unit hydrographs.Grant Agreement No. 14-31-0001-3565

Solution of problems of unsteady free surface flow in storm drains

November 1970.Includes bibliographical references (pages 74-79)