Estimating Number and Duration of On-Times for Surge Irrigation
Research shows surge flow can achieve efficient and uniform irrigation on some soils. However, most available information focuses on computerized analysis and modeling for research purposes....
Laboratory and Field Determined Seepage (
In order to obtain quick and reliable estimates of seepage, an attempt was made to establish a relationship between one or more of the properties of concrete canal lining and seepage....
Furrow Modeling with Variable Hydraulic Characteristics
A zero inertia furrow irrigation model was developed to run on an IBM-compatible micro-computer. The depth gradient term of the momentum equation is approximated by averaging over the...
Effect of Rainfall Intensity Distribution on Excess Precipitation
The effect of the time distribution of rainfall intensity on the prediction of the depth of excess precipitation is evaluated. A comparison is made of the excess precipitation produced...
Seepage/Drainage Investigation Colusa County California
High groundwater in the late winter months saturates the soil profile, causing damage to both crops and soil. Sustained water logging severely damages or destroys orchards. It has generally...
Geotechnical Practice for Waste Disposal '87
This volume contains 55 papers covering many aspects of geotechnical issues associated with waste disposal. The papers represent advances during the intervening decade since the first...
Construction Guide Liners
Geomembrane liners for waste construction require meticulous construction, monitoring and weather watching. With much concern over the longevity of geosynthetics, many overlook the extreme...
An Expert System for Inactive Hazardous Waste Site Characterization
The area of hazardous waste management is a broad and multidisciplinary field requiring expertise in engineering, geology, chemistry and toxicology, and is an ideal area for the application...
Attapulgite: A Clay Liner Solution?
Poor performance of clay liners at waste management facilities has resulted in the EPA mandate of synthetic polymeric liner materials to comply with zero penetration requirements. Laboratory...
Permeability, and the Field Pumping Test
Methods of estimating in situ permeability of soils are discussed including laboratory tests, borehole tests and field pumping tests, with emphasis on the latter. Techniques for designing...
In Situ Measurement of Permeability in Soft Clays
As part of an extensive field programme, the magnitude of errors due to clay remoulding and filter clogging in tests performed in common piezometers is evidenced. Comparisons between variable...
Seepage Studies Using Tracers and the Self Potential Test
Mill Creek Dam, a homogeneous silt structure resting on a conglomerate foundation, has experienced severe 'seepage since its construction in 1941. In 1981, a concrete cutoff...
In-Place Permeability Measurement of Slurry Trench Cutoff Walls
A suggested procedure for the in-place measurement of slurry trench cutoff wall permeability is presented. The H. Bouwer and Rice method, employing a single observation well and variable-head...
Testing of Permeable Materials for Retaining Contaminants in Subsurface Leachates
The use of a permeable, retentive treatment system could remove both organic and inorganic contaminants while still allowing flow. A testing procedure for determining the amounts of priority...
Permeability of Grouts Subjected to Chemicals
This paper presents the more recent results of a testing program which evaluated the long-term resistance to percolation of grouted soils, using acrylate, urethane and cement-bentonite...
Decreasing Clay's Permeability Using Aluminum Salts
The permeabilities of montmorillonite and kaolinite clays were reduced by precipitating aluminum hydroxide in the pores of the clay. The precipitate was formed by permeating the clays...
Clay Liner/Leachate Compatibility Modeling
Over the past several years, the results of many laboratory studies assessing the effect of various combinations of organic and inorganic chemical mixtures on the hydraulic conductivity...
Geotechnical Characteristics of Seafloor Sediments: Norton Sound, Alaska
During the past few years the USGS has been conducting studies in the northern Bering Sea aimed at identifying geologic and environmental conditions that may be hazardous to offshore resource...
Seepage Control at Cochiti Dam, New Mexico
Significant design data, design assumptions and computations, and performance of the seepage control features provided at Cochiti Dam are summarized in this paper. The dam is a rolled...
Irrigation Canal Seepage and its Measurement
Reduction in seepage is one of the primary reasons used to justify investment in canal lining. Such justification depends greatly upon estimates of seepage through surface and subsurface...
Return to search