Arkansas Water Resources Research Center Pamphlet

Arkansas Water Resources Research Center (AWRRC), through research is committed to meeting the many and varied challenges presented to water quality by Arkansas\u27 burgeoning urban, agricultural, and recreational water demands

Qualitative and Quantitative Aquatic Algal Data Compilation to Determine Macrotrends

A data base of the algae of Arkansas has been initiated by the selection of a relational data base management system. The system was chosen to be readily available for microcomputers using MS- or PC-DOS. The initial parameters chosen for entry are associated with the classification of the organisms from Class to the Variety level with author and year of initiation. Further annotation includes identification source. Presently, the data base of 1,162 taxa includes 226 Cyanophyceae, 367 Chlorophyceae, 124 Euglenophyceae, 26 Xanthophyceae, 81 Chryso- phyceae, 279 Bacillariophyceae, 33 Pyrrhophyceae, 14 Cryptophyceae, and 5 Rhodophyceae. These taxa are sortable by any of the included parameters. The data base will be archived as a portion of the flora and fauna series of the state of Arkansas

A Study of Phytoplankton Dynamics in Lake Fayetteville as a Means of Assessing Water Quality

Phytoplankton community was analyzed for seasonal and vertical distribution in Lake Fayetteville. This northwest Arkansas reservoir maintains a stable water level and chemical input with a relatively constant, slow overflow. Its source is groundwater seepage through a calcareous substrate with little contribution from the limited drainage basin. Phytoplankton community development with its associations and assemblages, chlorophylls -a, -b and c, and biomass distribution are described. The seasonal cycles of the chemical parameters NH4-N, NO2-N, NO3-N, ortho-phosphate, silicon, pH, HCO3- and total-alkalinity plus oxygen are described and discussed. The physical parameters of temperature, light and climate are included. The interaction of these parameters and other factors are related to phytoplankton dynamics

Relationship Between Ground and Surface Water Quality in Karst Systems

Springs in Northwest Arkansas may originate from relatively small fractures in rock strata or from cave systems. The water emerging from these springs is frequently used as water sources for plants, animals and humans. The quality of the ground water source and the emerging water are uncertain and frequently unknown. In addition, the opportunity to monitor changes in water quality during flow from origin (water entering the cave) to emergence is uncommon. Cave systems with definable drainage basins and accessible sampling points near the midpoint of the cave are also uncommon. Examining the interface between the quality of surface water source and the changes in ground water quality during its traverse to a spring provides valuable information concerning hydrogeological processes

Qualitative and Quantitative Aquatic Algal Data Compilation to Determine Macrotrends- III

A data base of the algae of Arkansas ecoregions has been established by the use of a relational data base management system (dBase III plus). The system was chosen to be readily available for a variety of microcomputers using MS- and PC-DOS. The data base contains taxonomic fields from division through variety, synonymy, authors, initial description, date and definitive descriptive source. The data are cross-referenced by ecoregion, Round\u27s community and subcommunity designations. The data base contains approximately 1,500 taxonomic records in all divisions and classes of freshwater algae. The data are sortable by any of the included parameters. The data have been used to initiate the publication of the algal flora of Arkansas. The listing of the Cyanophyta/Cyanobacteria or blue-green algae is presently available. Other taxonomic lists are in preparation

Supporting Rural Non-Farm Enterprises: What Can be Learned from Donor Programs?

This paper presents a summary of the large and growing literature about donor experience in attempting to meet employment and income objectives through assistance to the rural non-farm enterprises. Key conclusions about these experiences are presented stressing those that have implications for Philippine rural development and for the upcoming PIDS Dynamics of Rural Development project.rural nonfarm enterprise, nonfarm work

Design issues for lunar in situ aluminum/oxygen propellant rocket engines

Design issues for lunar ascent and lunar descent rocket engines fueled by aluminum/oxygen propellant produced in situ at the lunar surface were evaluated. Key issues are discussed which impact the design of these rockets: aluminum combustion, throat erosion, and thrust chamber cooling. Four engine concepts are presented, and the impact of combustion performance, throat erosion and thrust chamber cooling on overall engine design are discussed. The advantages and disadvantages of each engine concept are presented