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Irrigation Lettuce with Buried Drip, Surface Drip, and Furrow Irrigation: Spatial Variability of Plants, Soil, and Water
Spatial variability of plant growth, soil, and water was investigated for a furrow, surface drip, and subsurface drip irrigation systems. Variability was analyzed by sampling plant weight,...

Development of a Hydrological Database for PROSIM?A Water Rights-Based Operational Simulation Model of the Provo River
The development of a hydrological database for a computer model of the hydrology, water rights, and operations of the Provo and Weber rivers is described. The model uses all pertinent...

Estimating ET Using Turbulent Coherent Structures
Two methods for estimating sensible heat flux to use in energy balance equations for computing crop evapotranspiration are discussed. The methods use high frequency temperature measurements...

Hourly Reference Evapotranspiration by Bowen Ratio and Penman Methods
Hourly and daily reference evapotranspiration (ETo) computed from Bowen ratio energy balance (BREB) measurements were compared with ETo estimated from the hourly Penman equation (ETP)....

The Utah Climate Center Weather Data Network
The Utah Climate Center weather data network includes 52 sophisticated, automated weather stations. Weather parameters are monitored in real-time and hourly summarized data are gathered,...

The DWR Delta Data Assembly Project
While much progress has been made in advancing the theoretical development of estuary models, relatively little effort has been made in improving the quality and quantity of historical...

Removal of Tidal Fluctuations from Pumping Test Data
A simple technique for removing tidal fluctuations from drawdown data was examined. This technique relied simply upon transforming measured surface water level data to fit the pretest...

Quality Control and Quality Assurance Plan for Bridge Channel-Stability Assessments in Massachusetts
A quality control and quality assurance plan has been implemented as part of the Massachusetts bridge scour and channel-stability assessment program. This program is being conducted by...

Mechanics of Riprap Movement in Tidal Flow
This analysis emphasizes the need to obtain data on the size and shape of riprap pieces as a function of movement, data which are surprisingly difficult to obtain from published studies....

Modeling the Fate and Transport of Toxic Heavy Metals in South San Francisco Bay
A two-dimensional vertically-averaged finite element model for the fate and transport of cohesive sediments and associated toxic heavy metals was utilized to predict the spatial and temporal...

Reclamation's Design Process of Early Warning Systems for Dam Safety
This paper discusses the Bureau of Reclamation's process for designing the detection and decision making components of an Early Warning System (EWS) for dams with hydrologic deficiencies....

U.S. Geological Survey Bedload Sampling Policy
During the late 1960's, the U.S. Geological Survey's (USGS) Water Resources Division (WRD) developed the Helley-Smith bedload sampler. Since then, the USGS and the Technical Committee...

Bridge Abutment Scour in a Floodplain
Recent bridge failures due to pier and abutment scour have reinforced the need for better methods of scour prediction. This paper addresses the problem of prediction of clear-water scour...

Regulation of Flow Downstream of Weirs
Reregulation weirs are one means adopted by the Tennessee Valley Authority (TVA) to provide continuous improved minimum flow and wetted area for aquatic life downstream if hydroprojects...

Variation of Froude Number with Discharge for Large-Gradient Streams
Under chemical-control conditions, the Froude number (f) for a cross-section can be approximated as a function of the ratio R^{2/ 3}/d^...

Prediction of Gravel Transport Using Parker's Algorithm
This paper demonstrates that sediment discharge in gravel streams can be reasonably estimated by calibrating the Parker and Klingeman procedure. This paper also identifies the need for...

Innovations and Practical Procedures for Hydraulic Model Applications in Bridge Scour Evaluations
Procedures for data conversion, and establishment of downstream boundary conditions for a hydraulic computer model for estimation of riverbed scour at bridges are presented. The data conversion...

Time-Dependent Landslide Probability Mapping
Case studies where time of failure is known for rainfall-triggered debris flows can be used to estimate the parameters of a hazard model in which the probability of failure is a function...

Development of Bridge-Scour Instrumentation for Inspection and Maintenance Personnel
Inspecting bridges and monitoring scour during high flow can improve public transportation safety by providing early identification of scour and stream stability problems at bridges. Most...

Using Geophysical Data to Assess Scour Development
The development of scour holes in the Connecticut River near the new Baldwin Bridge has been documented by comparing geophysical records collected before (1989), during (1990), and after...

 

 

 

 

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