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The 4-parameter generalized lambda distribution (GLD) is a flexible distribution capable of mimicking the shapes of many distributions and data samples including those with heavy tails. The method of L-moments and the recently developed method of trimmed L-moments (TL-moments) are attractive techniques for parameter estimation for heavy-tailed distributions(More)
16. Abstract Peak-streamflow frequency estimates are needed for flood-plain management; for objective assessment of flood risk; for cost-effective design of dams, levees, other flood-control structures; and for design of roads, bridges, and culverts. Peak-streamflow frequency represents the collective peak streamflow for recurrence intervals of 2, 5, 10,(More)
16. Abstract Hyetographs and storm depth distributions are important elements of hydraulic design by Texas Department of Transportation engineers. Design hyetographs are used in conjunction with unit hydrographs to obtain peak discharge and hydrograph shape for hydraulic design. Storm-depth distributions can be used to assess the probability of a total(More)
16. Abstract The unit hydrograph is defined as a direct runoff hydrograph resulting from a unit pulse of excess rainfall generated uniformly over the watershed at a constant rate for an effective duration. The unit hydrograph method is a well-known hydrologic-engineering technique for estimation of the runoff hydrograph given an excess rainfall hyetograph.(More)
Description This package implements extensive, but select, functions for copula computations and is used by several other packages by the author. This particular package provides the lower,upper, product, ''PSP,'' and Plackett copulas. Plackett parameter estimation is provided. Expressions available for an arbitrary copula include the diagonal of a copula,(More)
NOTICE The United States Government and the State of Texas do not endorse products or manufacturers. Trade or manufacturers' names appear herein solely because they are considered essential to the object of this report. 16. Abstract: Equations to estimate timing parameters for a watershed contain watershed slope as a principal parameter and estimates are(More)
Top right, Argonaut SW installed inside steel pipe over diversion spring at San Marcos Springs. Bottom left, U.S. Geological Survey diver testing velocity data acquisition in one of the spring sand boils of San Marcos Springs using an Argonaut ADV 3–D. Photograph by Tom Wiles. Bottom right, U.S. Geological Survey divers installing acoustic Doppler velocity(More)
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