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Full-Text Articles in Engineering
The Application And Effectiveness Of Slow Sand Filtration In The United States, L. A. Slezak, Ronald C. Sims
The Application And Effectiveness Of Slow Sand Filtration In The United States, L. A. Slezak, Ronald C. Sims
Biological Engineering Faculty Publications
A survey of 27 slow sand filtration plants in the United States indicated that most of these plants are currently serving communities of fewer than 10 000 persons, are more than 50 years old, and are effective and inexpensive to operate. A slow sand filtration research facility in Logan, Utah, was compared with the operating plants to determine if locally available, unsieved sand achieved similar results. The 75‐m3/d research facility performed well in removing turbidity, coliform bacteria, and particles of a size representative of Giardia cysts.
Solar Earth‑Water Distillation For Wet Sand, Richard C. Peralta, Timothy M. Skergan, David B. Marx
Solar Earth‑Water Distillation For Wet Sand, Richard C. Peralta, Timothy M. Skergan, David B. Marx
Civil and Environmental Engineering Faculty Publications
Solar earth-water distillation is a means of extracting moisture from an earth medium. Three designs of the hot-box type of solar earth-water still were tested using wet or saturated sand. The designs included: low height with reflective interior siding, tall height with reflective siding and tall height with absorptive siding. The daily volume of distillate from different designs was compared. A twenty-centimeter-tall still with reflective siding produced significantly greater yields than one twice as tall. No significant difference in the yield between tall stills with light-absorptive versus light reflective interior siding was found. A regression equation was developed to predict …
Arkansas Groundwater Management Via Target Level, Richard C. Peralta, Ann W. Peralta
Arkansas Groundwater Management Via Target Level, Richard C. Peralta, Ann W. Peralta
Civil and Environmental Engineering Faculty Publications
AN approach to groundwater management by maintaining "target" groundwater elevations is presented. A finite difference form of the Boussinesq equation is proposed as a means of determining the groundwater withdrawals that will maintain those levels in the long term. This spatially distributed pumping can represent a sustained yielding pumping strategy. A sample pumping strategy is presented for the Arkansas Grand Prairie. Such a strategy is applicable under a variety of legal systems. It represents an especially attractive alternative for riparian rights states (like Arkansas) where effective groundwater management without radical changes in the basic water rights system is desired.
Assessment Of Potential Irrigation Water Needs In The Bayou Meto Watershed, Richard C. Peralta, Paul W. Dutram
Assessment Of Potential Irrigation Water Needs In The Bayou Meto Watershed, Richard C. Peralta, Paul W. Dutram
Civil and Environmental Engineering Faculty Publications
No abstract provided.
Using Target Levels To Develop A Sustained Yield Pumping Strategy And Its Applicability In Arkansas, A Riparian Rights State, Richard C. Peralta, Ann W. Peralta
Using Target Levels To Develop A Sustained Yield Pumping Strategy And Its Applicability In Arkansas, A Riparian Rights State, Richard C. Peralta, Ann W. Peralta
Civil and Environmental Engineering Faculty Publications
Groundwater is the major source of water for consumptive use in Arkansas. Significant pumping is concentrated in areas of agricultural and industrial production. In a number of these areas, including much of the Grand Prairie region of Arkansas, average annual withdrawal from the aquifer exceeds recharge. As a result of this groundwater mining, water levels are dropping. Mining which leads to excessive declines in the water level can accelerate salt water intrusion in an aquifer, cause aquifer compaction, make irrigation economically unfeasible, and eventually disrupt an economy based upon groundwater. Generally, these problems can be prevented or limited by maintaining …
Projected 1992 Groundwater Levels On The Arkansas Grand Prairie, Richard C. Peralta, Aminollah Yazdanian
Projected 1992 Groundwater Levels On The Arkansas Grand Prairie, Richard C. Peralta, Aminollah Yazdanian
Civil and Environmental Engineering Faculty Publications
The Arkansas Grand Prairie has been a major rice producing area for most of this century. The irrigation water required for rice, and at the present time, for soybeans, is primarily obtained from a Quaternary aquifer. This extensive formation underlies much of eastern Arkansas as well as parts of other states. Groundwater enters the Grand Prairie region from extensions of the aquifer lying outside of the area. Prolonged pumping of water from the aquifer at a rate exceeding the recharge rate has significantly reduced Quaternary groundwater levels in the Grand Prairie.
Optimizing Conjunctive Use Under Sustained Yield Constraints, Richard C. Peralta, P. Killian, W. D. Dixon
Optimizing Conjunctive Use Under Sustained Yield Constraints, Richard C. Peralta, P. Killian, W. D. Dixon
Civil and Environmental Engineering Faculty Publications
Distributed parameter groundwater management model utilizing quadratic programming to develop a steady-state potentiometric surface is presented. Minimization of cost of meeting water needs from groundwater and alternative water sources is achieved. Drawdowns, groundwater withdrawal and recharge are all constrained. Applicable for assuring agregiorral sustained yield of groundwater.
Determination Of The Minimum Target Saturated Thickness Needed For Drought Protection In A Critical Cell, Paul W. Dutram, Richard C. Peralta
Determination Of The Minimum Target Saturated Thickness Needed For Drought Protection In A Critical Cell, Paul W. Dutram, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
The Grand Prairie region of Arkansas is underlain by a Quaternary aquifer which is utilized primarily for the irrigation of rice and soybeans. Irrigators have been concerned with wells going dry and with decreased well capacities. In this report the term "drawdown" refers to the distance between an arbitrarily assigned datum at or above the ground surface, and the elevation of the groundwater table. The cumulative drawdown (day to day decrease in the groundwater table elevation) resulting from withdrawal of groundwater from interacting wells has caused yields in some wells to be less than design discharge. Drawdown is a function …
The Effects Of Climatic Factors And Still Design On Solar Earth‑Water Distillation For Saturated Sand, Timothy M. Skergan, Richard C. Peralta
The Effects Of Climatic Factors And Still Design On Solar Earth‑Water Distillation For Saturated Sand, Timothy M. Skergan, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
No abstract provided.
Water For The 21st Century, Will It Be There?, Richard C. Peralta, Ann W. Peralta, Leslie E. Mack
Water For The 21st Century, Will It Be There?, Richard C. Peralta, Ann W. Peralta, Leslie E. Mack
Civil and Environmental Engineering Faculty Publications
One of Arkansas' major water management goals is to provide adequate water for agriculture, the economic mainstay of the state. Effective water management requires inputs from engineering, economics, law, administration, and environmental concern, all in a matrix of public education, participation and communications. Groundwater levels in eastern Arkansas have been dropping for decades as irrigation for rice, other row crops, and fish farming have increased substantially. Additional surface water supplies are available from the adjacent rivers but there are competition, conflict of use, and jurisdictional problems involved. A critical path sequence chart was designed to include all the research steps …
Time‑Varient Water Needs Of The Boeuf‑Tensas Basin, Paul W. Dutram, Richard C. Peralta, Paul J. Killian
Time‑Varient Water Needs Of The Boeuf‑Tensas Basin, Paul W. Dutram, Richard C. Peralta, Paul J. Killian
Civil and Environmental Engineering Faculty Publications
No abstract provided.