A new computer program has been developed to determine time-of-travel capture zones in relatively simple geohydrological settings. The WhAEM package contains an analytic element model that uses superposition of (many) closed form analytical solutions to generate a ground-water flow solution. WhAEM consists of two executables: the preprocessor GAEP, and the flow model CZAEM. WhAEM differs from e...

An algorithm utilizing measured temporal tritium ( H) variation in selected Piedmont basins is 3 developed for the computation of subsurface residence times of shallow ground water comprising stream base flow. This algorithm accounts for the effects of radioactive decay, the mixing of shallow subsurface water with precipitation, and ground-water flux to streams (base flow). The input data requi...

Introduction: Martian surface ice is currently observed only as polar layered deposits (PLDs), whereas Mars Odyssey Gamma Ray Spectrometer [1,2] and Mars Express’s radar sounder observations [3] propose the presence of much larger amount of ground ice in the midto high-latidutes. Such a ground-ice region is expected to spread over a few tenths of percent of the total Martian surface, yet the th...

The principles of irrigation and drainage in cracking soils differ markedly from non-cracking soils, and are not thoroughly understood. This paper presents a conceptual model to simulate water and salt flows in cracking soils of the Imperial Valley, CA, in the presence of ground water that contributes partially to ET demand of crops. A salt reactivity function is introduced in the model to acco...

background: the goal was to upgrade and/or uprate the traditional non-contact array by producing few modifications in the configuration of this model in order to maximize light receiving of water from the uv lamp and a better disinfection.  methods: an innovative non-contact model was made with a design based on irradiation of water, which was flowing as two thin waterfalls around a uv lamp in ...

Contamination of ground water is a major concern for citizens as well as local, state, and federal agencies that are involved with the management, quality and quantity of water and human health. However, the generation of vulnerability maps or delineations of vulnerable zones in a map for monitoring purposes are difficult since ground water contamination depends upon numerous, complex interacti...

BACKGROUND Antibiotic residues are being constantly identified in environmental waters at low concentration. Growing concern has been expressed over the adverse environmental and human health effects even at low concentration. Hence, it is crucial to develop a multi-residues analytical method for antibiotics to generate a considerable dataset which are necessary in the assessment of aquatic tox...