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Estimating Floodplain Limits for Complicated Hydrologic and Hydraulic Conditions
A new approach for estimating floodplain limits is shown. A hydraulic model with flood routing capabilities is coupled with a hydrologic model to compute river stages. Simulations are...

A Unified Approach to Flood Frequency Analysis
Most stochastic hydrologic studies are based on statistical distributions that are pre-selected without giving consideration to the applicability of the distribution to a particular data...

A New Look at the Statistical Estimation of PMP
The statistical base of Hershfield's K_mvalue Method and its application for estimating Probable Maximum Precipitation (PMP) were reviewed. The mathematical...

GIS-Integrated Surface Hydrology System
A GIS-based stormwater management system has been developed for the Pasco County Board of County Commissioners. The model draws all spacial data including watershed parameters, network...

Impact of Digital Elevation Model Grid Size on Extracted Drainage Parameters
The dependence of extracted drainage network properties on the spatial resolution of DEMs is investigated for a study basin. A series of raster DEMs of increasing cell size is generated...

A Log-Triangular Design Hyetograph for Stormwater Management
A method is developed to generate a log-triangular design hyetograph from historical rainfall data. The method considers the characteristics from other commonly used methods for design...

WSR-88D Precipitation Processing and Its Use in National Weather Service Hydrologic Forecasting
The National Weather Service (NWS), along with the Department of Defense and Transportation, have begun deployment of a new national network of weather radars referred to as the WSR-88D....

Simulation of Changes in Storm-Runoff Characteristics, Perris Valley, California
The population of Perris Valley, California, has increased from about 20,000 in 1970 to more than 130,000 in 1992. Increased urbanization in Perris Valley since 1970 has produced appreciable...

An SCS-Based Model for Hydrologic Analysis of Watersheds
A single-event mathematical watershed model is presented in this paper to compute runoff resulting from any natural or synthetic rainfall. The formulations of the various hydrologic processes...

Field-Scale Research at the TVA Columbus Groundwater Research Test Site
TVA has been conducting large-scale field experiments at their Columbus Groundwater Research test site at Columbus Air Force Base since 1983. This work has been performed in cooperation...

County Hydrology, Regional Approach
The effort to update the regional hydrology methods of the Santa Clara Valley Water District (District) entails a series of tasks that are long and difficult. This paper enumerates the...

On the Calibration of Hydrologic Models
A procedure is proposed to calibrate hydrologic models to generate representative design flows and flood hydrographs. This procedure includes two calibration steps; event calibration and...

Sacramento Drainage Manual?Hydrologic Procedures
For a period of over two years, HDR Engineering, Inc. (HDR) and HYDMET have been working with the City and County of Sacramento to develop a Drainage Manual. This Manual contains seven...

Sacramento Hydrologic Procedures Interim Adoption
In November 1989, the County and City of Sacramento jointly undertook the development of a manual for the design of drainage and flood control facilities in the region. Significant technical...

Orange River?System Analysis
The Orange River drains the largest basin in Africa south of the Zambezi with a total catchment area of approximately 1 million km². Due to the increasing...

Estimating Watershed Runoff fro Lightning Data?A Case History
A major problem in the application of hydrologic models to ungaged watersheds is the lack of necessary rainfall data. In most cases watersheds gaged for streamflow have no or only one...

Spatial and Temporal Characterization of Drought
Drought is difficult to define for common understanding. Several definitions are presented. The Palmer Drought Severity Index (PDSI), the Palmer Drought Hydrologic Index (PDHI) and the...

Spatial and Temporal Precipitation Characteristics in Southwest Idaho
The USDA-ARS, Northwest Watershed Research Center operates a precipitation gage network on the Reynolds Creek Experimental Watershed in southwest Idaho. Analysis of the 30-yr (1962-1991)...

Probabilistic Characteristics of Elapsed Time Between Rainfalls
The elapsed time between rainfalls is analyzed statistically using the hourly rain data at two locations: the flat-plain at Urbana, Illinois and the northwestern Appalachian foothills...

Analysis of Spatial and Temporal Precipitation Data Over a Densely Gaged Experimental Watershed
Historical precipitation data from the densely gaged Walnut Gulch Experimental Watershed in southeastern Arizona are used to quantify watershed-scale properties of precipitation. Daily,...

 

 

 

 

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