We are called upon to be trustees and managers of our nation's resources, the air in our cities, and water in our aquifers, streams, estuaries, and coastal areas.
To improve our knowledge of the interactions and water transfers between the cryospheric compartment (glacier, debris-covered glacier, and rock glacier) and the hydrological compartment (aquifers, streams), the results of monitoring of meteorological conditions, as well as discharge, conductivity and temperature of streams and springs located in the Tapado catchment were analyzed.
When film-maker Josh Fox tracks the hundreds of truckloads used to convey the process into (and out of) a region, the numbers reveal that nearly half of these chemicals are left behind to evaporate into the air, and seep into wells, aquifers, streams, and creeks that flow into rivers.
This article reports an investigation of the component (module) that describes the stream-aquifer flow exchange in several groundwater simulators.
The study indicates that the module may not have a solid physical basis when used in large-scale regional studies to estimate the stream-aquifer flow exchange.
We conduct a series of two- and three-dimensional simulations to identify the validity and range of applicability of these assumptions, and to quantify their impact on estimation of aquifer drawdown, stream depletion, their sensitivities to the hydrogeologic parameters, and on selection of optimal locations to observe drawdown during a pumping test.
Topics include Darcy equation, flow nets, mass conservation, the aquifer flow equation, heterogeneity and anisotropy, storage properties, regional circulation, unsaturated flow, recharge, stream-aquifer interaction, well hydraulics, flow through fractured rock, numerical models, groundwater quality, contaminant transport processes, dispersion, decay, and adsorption.
Unique to horizontally anisotropic and homogeneous aquifers, the stream depletion rate at any given pumping rate depends closely on the horizontal anisotropy ratio and the direction of the principle transmissivities relative to the stream-bank.
They are briefly evaluated and classified according to six categories of aquifer type, flow dimension, aquifer domain, stream representation, stream channel geometry, and well type.
WASHINGTON — Millions of dollars in farm subsidies for irrigation equipment aimed at water conservation have led to more water use, not less, threatening vulnerable aquifers and streams.
