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On Modelling the Nonlinear Relationship Between Random Fields by Means of Higher-Order Spectra
This paper addresses the input-output relationship of nonlinear systems that may be expressed in terms of a hierarchy of linear, quadratic and higher-order transfer functions or corresponding...

Pressures on Prisms in Turbulent Shear Flows
Experimental results are presented which show that Melbourne's 'Small Scale Spectral Density Parameter,' S, controls the negative pressures on the...

A Simple Nonpoint Source Groundwater Quality Management Model
A model is examined which efficiently produces information required by decision makers to assess water quality tradeoffs associated with alternative groundwater protection strategies,...

Sanitary Sewer Model with Database Management
While numerous water supply and stormwater system models existed, the few sanitary sewer models that were readily available were too simplistic for engineering design and master planning...

Sanitary Sewer System Modeling for Operation and Planning
Development of a Steady State Sanitary Sewer Simulation (S⁵) computer model helped Newport News, Virginia, enact an efficient sanitary sewer management...

Stochastic Model for the Management of a Stream-Aquifer System
The management of a system of groundwater and surface water requires that the hydraulic connection of the two sources be investigated. The inherent uncertainties that exist in the data,...

Conjunctive Use Study of Groundwater and Surface Water in Chino Basin, California
The purpose of this paper is to study the effects of artificial recharge on an already contaminated unconfined aquifer and propose optimal recharging and pumping schemes to prevent the...

Regional Assessment of Pumpage in Southeastern Virginia
A U.S. Geological Survey investigation was conducted, in cooperation with the Virginia Water Control Board, to analyze the hydrogeology and groundwater flow system in the Coastal Plain...

Leachate Flow Through Landfills
The problem of estimating the amount of leachate generated in a landfill site is of significance in the assessment of potential environmental impacts. Although there are a variety of regulations...

A Ground Water Modeling Effort to Simulate the Results of An Aquifer Restoration Scheme
A ground water model using the IBM PC version of the USGS MODFLOW code was constructed to simulate the ground water flow beneath an industrial site in the central Midwest. A detailed three-dimensional...

Application of a GIS to a Ground Water Classification System
New more effective methods of ground water management are being developed by the New Jersey Department of Environmental Protection (NJDEP) including an anticipatory conceptual State ground...

Computerized Bridge Coding for HEC-2 Applications on I.B.M. P.C.
A computer program for conversion of survey field notes directly into SB, BT, and GR cards with simultaneous cross-section plot is described. It was designed to simplify the coding of...

Administration of Water in the 21st Century in Accordance with the Appropriation Doctrine
In accordance with the appropriation doctrine it appears straightforward to distribute water during below-average supply, 'first in time of use, first in right of use'....

GWPATH: Ground-Water Flow Path Analysis
GWPATH is an interactive software package for estimating horizontal fluid pathlines and travel time in fully saturated groundwater flow domains. GWPATH was developed for the IBM PC-AT...

A Vectorized Polynomial Preconditioned Conjugate Gradient Solver Package for the USGS 3-D Ground-Water Model
A vectorized polynomial preconditioned conjugate gradient (PPCG) numerical algorithm is presented as an additional solver package interfaced with the Modular Three-Dimensional Finite Difference...

Movement of Chloride Ions in a Saturated Soil Sample
A series of laboratory experiments were performed to demonstrate and track the migration of chloride ions in saturated soil samples undergoing freezing. Results from these experiments...

Foam Over Troubled Toxics
Foams are now being used to control noxious vapor emissions from hazardous waste landfills. Another use of foams is in control of vapors emitted by chemical spills and fires. This article...

Pinpointing Nonpoint Pollution
The Tennessee Valley Authority is using aerial photography to locate nonpoint sources of water pollution. These cause most of the water quality problems in the region. Failing septic tanks...

Comprehensive Rehabilitation Results From Stege Sanitary District
Seven sewer agencies, including Stege Sanitary District, in the East Bay of the San Francisco Bay Area embarked on a 20-year capital improvement program in 1987. The 300 million construction...

Advanced Chemigation Systems for Environmental Safety and Groundwater Protection
A multifunction irrigation system has been developed which utilizes a separate dynamic in-canopy nozzle system for chemical application. Testing the system with a lithium tracer on four...

 

 

 

 

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