Sensing by Satellite
Commercially available data collected by U.S. and French satellites re helping civil engineers take a closer look at our planet. Also available are PC-based image processing systems that...
Hydraulic Effect of Turbid Water Infiltration Through a Shallow Basin
A 225 m2 test basin was operated from September 1986 through October, 1987, to determine the hydraulic effects of turbid water application. Initial...
Ground Water Recharge Through Wells
Surface runoff water accumulates in natural depressions called playas on the Southern High Plains; most of it is wasted by evaporation. The water is turbid, but otherwise of good quality...
Environmental Considerations to Channel Dredging
In this paper two principal areas of environmental concern were investigated. The first is the physical impact of dredging and deposition of solid materials causing turbidity on aquatic...
Perceiving Toxic Chemicals in Fishing Environments
The perception of toxic chemicals in the fishing environments by anglers was examined in Kansas and Michigan. The main findings of the study were: 1) There appears to be a small, but significant...
Dispersal of Dredged Material Disposal Plumes
An empirical model describes dispersal of dredged material disposal plumes in an urban estuary, Central Long Island Sound, during spring of 1983. The model uses in situ current meter data...
Low Head Filtration Removal Efficiencies of
The removal of Giardia cysts from low turbidity waters is of great concern in many areas of the United States. A pilot program was undertaken to determine if an established low head filtration...
Grout Penetrability
The ability of a grout to penetrate a formation is always a selection requirement for projects in which fracturing is undesirable. The major grout properties affecting penetrability are...
Application of Phosphorus Models to New Mexico Reservoirs
Many empirical, mass-balance phosphorus models have been developed and tested on northern, temperature lakes and previously published. Fourteen of those published models were tested on...
Direct Filtration of High Turbidity Water Using Contact Flocculation
It is shown that the system of bed contact flocculation followed by standard dual media filters provides a viable alternative to both conventional as well as direct filtration, particularly...
Optimization of Design and Operating Parameters for Single-Media, Unstratified-Bed Filters
The potentially successful use of filters containing large grain-size single media for water filtration has prompted investigation of the parameters controlling the performance of these...
Oxygen Transfer Studies in Activated Sludge
A bench-scale research project was undertaken to evaluate the two-film model for predicting oxygen transfer rates in sparged suspended growth systems and to determine if interfacial oxygen...
Turbidity Control Measures Associated with Reclamation of an Abandoned Phosphatic Waste Clay Pond
Area 3A in the Tenoroc State Reserve near Lakeland, Florida is an inactive and abandoned phosphatic waste clay area. The disposal area has been inactive for several years and the clays...
Particle Interaction and Stability of Suspended Solids
The physics of particle interaction, which is responsible for the problem of the apparent tardy settling of suspended solids in tailings discharge slurries containing initially low concentrations...
Convection-Diffusion Analysis of Sedimentation in Initially Dilute Solids-Suspensions
The settling of suspended solids in solids-suspensions is treated from the viewpoint of the relative fluxes established as a result of the upward diffusion of water and the downward convection...
Turbidity Generated by a Model Cutterhead Dredge
The study of turbidity generation indicates that, in general, turbidity increases with an increase in the cutter speed and an increase in the cutter swing velocity. A silt curtain deployed...
Seasonal Restrictions on Bucket Dredging Operations
Seasonal restrictions are sometimes imposed on bucket dredging operations in response to concerns for potential impacts of sediment resuspension on various biological resources. The available...
Tampa's Hookers Point AWT Plant Working Well
The Tampa, Florida advanced wastewater treatment plant is designed to remove a high degree of BOD suspended solids, nitrogen and phosphorous. Presently, the state has exempted the plant...
How about Reverse Filters
Reverse or inverted filters allow water to drain freely without carrying away suspended solids. Their pore size must be properly related to the fines being protected. Terzaghi's...
Direct Filtration�� Past, Present, Future
The Safe Drinking Water Act of 1974 for the first time established national drinking water standards on turbidity and other drinking water characteristics. Up until that time, the accepted...
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