The standard formulation of a block-centered finite-difference model, such as MODFLOW, uses the center of the cell as the location of a cell node. Simulations of a dynamic water table can be improved if the node of a cell containing the water table is located at the water table rather than at the center of the cell. The LPF package of MOD-FLOW-2000 was changed to position a cell's node at the w...

evaluating drainage systems, exploring their strengths and weaknesses, provides a comprehensive perspective to designers and organizers for optimum design and implementation of guidelines for the future. this study was conducted at an experimental site consisting of three plots on a subsurface drainage network under operation in behshahr, a coastal region in northern iran. to evaluate system pe...

in tunisia, kalâat el andalous irrigated district is one of the most affected areas by salinization. the objective of this study was to predict the root zone salinity (over 10 years) in this area using the saltmod simulation model for subsurface drainage system. saltmod is based on water balance, salt balance model, and seasonal agronomic aspects. in the pilot area, irrigated vegetables crops s...

Floristic studies indicate the abundance of microalgae in northern boreal peatlands, but we know relatively little about their ecology or how they will respond to changes in environmental conditions expected in this region as climate changes. We examined changes in algal community structure at sites exposed to a long-term water-table manipulation, including drought (lowered water-table treatmen...

The Colorado River Basin is experiencing a significant drought that began in 2000. As water supplies are projected to continue declining, managers concerned with the ongoing treatability of Lake Mead water, which provides 90% source for Las Vegas Valley, and crucial link downstream water. drinking intake currently draws high-quality, low-turbidity water; however, turbidity increase. This study ...

Abstract Water resources management in high-stress regions is a large-scale problem affecting food and water security. Therefore, modern irrigation systems such as sprinklers, subsurface, drip irrigations are applied to manage the shortage of Nile delta. Because increase population rate climate change, freshwater supplies significantly limited must be efficiently managed. Consequently, Egypt pl...

playas are low-lands which is considered to be the locations of accumulation of superficial and ground waters fromhigher elevations and these waters have different types of salts and various salinity level. therefore, because of lack ofrainfall and fresh-water both for human and animal useage or even for plants, it is needed to apply proper methods toharvest fresh water from these saline-waters...

[1] Areas with a relatively shallow water table are environments where the groundwater plays a key role on the ecosystem function, and important interactions exist between hydrology and ecosystem processes. We propose here an analytical model to study the interactions between rainfall, water table, and vegetation in groundwater-dependent ecosystems. The water table dynamics are studied as a ran...

the system dynamics technique is an object-oriented approach that studies and manages complex feedback systems. its merits include the friendly and easy development and improvement of a model. it is also used as a decision tool for engineering problems. in this paper, the system dynamics technique was used to simulate the performance of a subsurface drainage system in an unsteady state. the mod...

CO2-Plume Geothermal (CPG) power plants can produce heat and/or electric power. One of the most important parameters for design a CPG system is CO2 mass flowrate. Firstly, flowrate determines generated. Secondly, has significant effect on fluid pressure drawdown in geologic reservoir at production well inlet. This because it lead to water flow towards and into borehole. Thirdly, directly affect...