Laserfiche WebLink
<br />I <br /> <br />The data will be analyzed to establish relationships between <br />storm rainfall and associated runoff from the basins. These <br />relationships will be defined by application of a hydrologic model <br />and other techniques as indicated hy Gonzalez and Ducret (1971). <br /> <br />I <br />I <br /> <br />To derive maximum henefit from a relatively short period of data <br />collection, the emphasis in these studies will be on the application <br />of the hydrologic model approach. Use of a model calibrated by actual <br />rainfall-runoff data will allow a long-term runoff record to be <br />synthesized from long-term rainfall records available in the general <br />area. This method is described in detail by Lichty, Dawdy, and Bergmann <br />(1968). A flood-frequency relation for each study basin will then be <br />defined by using the synthetic long-term flood record. To regionalize <br />the resulting flood~frequency relations, a regression equation <br />technique will be used as described by Benson (1962). These equations <br />will show the general relations between peak discharges of selected <br />frequencies and the hydrologic characteristics of any small drainage <br />basin within the study area. <br /> <br />I <br /> <br />Instrumentation <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Purpose and Scope <br /> <br />Throughout the period of study there has been considerable demand <br />by other investigators for basic rainfall-runoff information. The <br />purpose of this interim basic-data release is to present all significant <br />rainfall-runoff data collected from the beginning of the studies to <br />the end of the 1971 storm season. This type of report will be released <br />periodically as the studies progress. <br /> <br />The stage gage is mounted in the stream channel and generally <br />consists of a vertical 4-inch standard galvanized iron pipe well with <br />a metal shelter mounted on the top to house the recorder. The intake <br />to the well consists of six ~-inch holes in a standard 4-inch cap on <br />the bottom of the pipe. Five holes are evenly spaced on the upstream <br />face of the cap and one is centered in the downstream face. Experiments <br />have shown that this arrangement of holes assures nearly equivalent <br />water stages in the stream and the gage well through a wide range of <br />stream velocity. <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />Detailed records of rainfall and stream stage are collected at <br />'each station by the operation of two digital recorders, which code <br />the data on l6-channel paper tape at 5-minute intervals. Use of a <br />single timer provides for simultaneous actuation of both recorders. <br /> <br />6 <br /> <br />I <br />I <br /> <br />I <br />