Groundwater pumping influences the rate of River-Aquifer (R-A) exchanges and alters the water budget of the aquifer. Therefore, fulfilling the total water demand of the area, with an optimal pumping rate of wells and optimal R-A exchanges rate, is important for the sustainable management of water resources and aquatic ecosystems. Meanwhile, comparison of the output of different simulation-optimization techniques, which is used for the solution of water resource management problems, is a very challenging task where different Pareto fronts are compared to identify the best results. In the present work, mathematical models were developed to simulate the R-A exchanges for the lower part of the River Ain, France. The developed models were coupled with optimization models in MATLAB environment and were executed to solve the multi-objective optimization problem based on the maximization of pumping rates of wells and maximization of groundwater input into the river Ain through R-A exchanges...

2015

A stream depletion phenomenon has been studied for many decades and different analytical models were developed to find the effect of a pumping well on a nearby stream. Most developed models consider a constant stream stage or neglect the variation in stream stage. This is not the case in reality where stream flow and level continuously vary over time. In this paper a new analytical model was developed considering variation in stream flow (i.e. stream stage). The developed model considers the recession of stream flow and its impact on stream depletion and drawdown. A Comparison between the developed solution and the existing ones shows a significant discrepancy when the stream flow varies.

Journal of The Institution of Engineers (India): Series A, 2018

Groundwater is a major source for drinking and domestic purposes. Nowadays, extensive pumping has become a major issue of concern since pumping has led to rapid decline in the groundwater table, thus imposing landward gradient, leading to saline water intrusion especially in coastal areas. Groundwater pumping has seen its utmost effect on coastal aquifer systems, where the seaward gradient gets disturbed due to anthropogenic influences. Hence, a groundwater flow modelling of an aquifer system is essential for understanding the various hydrogeologic conditions, which can be used to study the responses of the aquifer system with regard to various pumping scenarios. Besides, a model helps to predict the water levels for the future period with respect to changing environment. In this study, a finite element groundwater flow model of a coastal aquifer system at Aakulam, Trivandrum district is developed, calibrated and simulated using the software Finite Element subsurface Flow system (FEFLOW 6.2).This simulated model is then used to predict the groundwater levels for a future 5 year period during pre monsoon and post monsoon season.

2001

Many irrigation areas suffer from extensive high watertables and the associated problems of salinity and waterlogging. This report investigates a general methodology for assessing the requirement for shallow groundwater pumping as a drainage measure and the possibility of conjunctive reuse of drainage water or the need for disposal. Assessments of priority areas for shallow groundwater pumping can be made by analysing the watertable surface across the region for any groundwater mounding, the depth to watertable and salinity of the shallow groundwater.

Journal of Hydrology, 2012

Stream depletion Drawdown Stream leakage Groundwater/surface water interaction Superposition principle s u m m a r y This study derives two dimensional analytical solutions for drawdown and stream depletion resulting from a pumping well near a stream. The solutions were obtained for both line-width and finite-width streams in unconfined/confined aquifers, based on the principle of superposition. These solutions are general enough to be used for different hydrogeological settings within both unconfined and confined aquifers.

Journal of Hydrologic Engineering, 2008

We present a simple approach to assess stream depletion by groundwater pumping in aquifers with leakage from an underlying source bed. The hydrogeological setting consists of a leaky aquifer that is hydraulically connected to a stream of shallow penetration. Under such conditions, the pumping rate is partially supported by the depletion of an adjacent stream. We quantify this phenomenon by

2010

Groundwater pumping causes depletion of groundwater storage. The rate of depletion incurred by any new well is gradually decreasing and eventually becomes zero in the long run, after induced recharge and reduction of natural discharge of groundwater combined (capture) have become large enough to balance the pumping rate completely. If aquifer-wide aggregated pumping rates are comparatively large, then such a new dynamic equilibrium may not be reached and groundwater storage may become exhausted. Decisions to pump groundwater are motivated by people's need for domestic water and by expected benefits of using water for a variety of activities. But how much finally is abstracted from an aquifer (or is considered to be an optimal aggregate abstraction rate) depends on a wide range of other factors as well. Among these, the constraint imposed by the groundwater balance (preventing aquifer exhaustion) has received ample attention in the professional literature. However, other constraints or considerations related to changes in groundwater level due to pumping are observed as well and in many cases they even may dominate the decisions on pumping. This paper reviews such constraints or considerations, examines how they are or may be incorporated in the decision-making process, and evaluates to what extent the resulting pumping rates and patterns create conditions that comply with principles of sustainability.

Water Resources Research, 1990

When used in conjunction with surface water for irrigation, pumped groundwater serves two roles: to increase the quantity of and to mitigate fluctuations in the supply of water. The latter is the stabilization role. The economic benefit associated with this stabilization role is first analyzed. The implications for the development of groundwater resources are then investigated. An estimate is given of the stabilization benefit to wheat growers of the fossil water aquifer underlying the Israeli Negev. It is found that, under the prevailing variability in the supply of surface water, this benefit may well exceed the groundwater benefit associated with the increase in water supply. INTRODUCTION When used in conjunction with surface water for irrigation, pumped groundwater serves two roles: first, to increase water supply and second, to mitigate undesirable fluctuations in the water supply. We refer to the latter as the stabilization role. The purpose of this paper is to assign an economic value to this stabilization role and to investigate policy implications concerning the development of groundwater resources. The task of how to use groundwater in conjunction with surface water has been the subject of much research, most notably that of Burr [1964a]. These analyses generally are carried out within a dynamic framework, seeking a rule for allocating the groundwater over time when the demand tbr groundwater varies according to available supply of surface water. The stabilization role of pumped groundwater and its implications for the development of groundwater resources remain implicit in these analyses; this work explicitly addresses these aspects. To focus attention on the main issue we abstract from dynamic considerations and present the analysis within a single period model. This is a legitimate description of a dynamic situation if either (1) the aquifer (eventually) reaches a steady state in which the rate of water recharge is at least as large as that of water withdrawal or (2) the aquifer is large relative to the area it is designated to serve so that the effect of any reasonable extraction sequence on the water level (hence on marginal pumping costs) is negligible. If rlone of these conditions hold, a dynamic modeling will need to be employed; we leave this task for future research. A discussion of how well a static allocation scheme approximates an intertemporal one can be found in the papers by Gisser and Sanchez [1980] and Gisser [1983]. The term "conjunctive groundwater and surface water system" is applied to a number of systems; they differ according to the surface water source. One extreme is a system in which the only source of surface water is stream flows emanating from aquifers. A situation similar to this is considered by Young and Bredehoeft [1972]. In the other extreme, surface water is independent of groundwater sources. Cummings and Winkelman [1970] analyze a system

Ground Water, 2007

River Research and Applications

Groundwater is a critically important source of water for river, wetland, lake, and terrestrial ecosystems, yet most frameworks for assessing environmental flows have ignored or not explicitly included the potential impacts of groundwater pumping on environmental flows. After assessing the processes and existing policies for protecting streamflow depletion from groundwater pumping, we argue that a new groundwater presumptive standard is critical as a placeholder to protect environmental flows in rivers lacking detailed assessments. We thus extend the previous presumptive standard to groundwater pumping, a different and important driver of changes to streamflow. We suggest that "high levels of ecological protection will be provided if groundwater pumping decreases monthly natural baseflow by less than 10% through time." The presumptive standard is intended to be a critical placeholder only where detailed scientific assessments of environmental flow needs cannot be undertaken in the near term. We also suggest a new metric, the environmental flow response time, that allows water managers to quantify the timescales of the impacts of groundwater pumping on the loss or gain of environmental flows.