Assessment of Water Supply Impacts for a Mine Site in Western Turkey

Modelling the effect of rainfall variability, land use change and increased reservoir abstraction on surface water resources in semi-arid southern Zimbabwe

Dewatering requirements of three open pits located in western Turkey and the impact of dewatering on groundwater resources were evaluated using a three-dimensional numerical groundwater flow model. The groundwater was modeled using MODFLOW software and the dewatering was simulated using the MODFLOW Drain Package. The drain cell configurations were determined by pit boundaries; invert elevations of drains corresponded to the bench elevations in the mining schedule, which varied dynamically among the three pits. Transient model runs were conducted for the 21 years of mine life to calculate the monthly dewatering rates. Simulation results indicate that the average groundwater inflow to the excavations is 3.64 L/s, excluding the effects of direct rainfall into the pits and surface water flow from the benches. Long term (80 years) simulations were conducted to predict the amount of drawdown at the water supply wells in the area. The results indicate that 21 years of mining will not significantly impact the water levels in these wells. However, natural discharge from the springs near the pits will be exhausted by the dewatering.

The integration between WEAP and MODFLOW models coupled via LinkKitchen helps to create a dynamic link between surface water and groundwater supply sources of Addis Ababa city. Possible impacts of natural and anthropogenic stresses on surface water reservoirs volume and groundwater storage have been assessed through water supply scenario analysis. Besides, contrary to other surface water hydrological models, the unique nature of WEAP adds water demand assessment by simulating Addis Ababa city near future water demand coverage under three population projection scenarios. The water demand projections of Addis Ababa city indicates 100% water demand coverage will not be achieved for high (4.6%), medium (3.8%) and low (2.8%) population growth rate projections, even with all the emerging and planned water supply projects start production up until 2025. Supply scenario projections indicate, as surface water reservoirs are highly sensitive to climate change and variability, the city groundwater supply sources will be noticeably affected by the emerging and planned groundwater supply expansion schemes. If groundwater abstraction continues to reach to zero unmet demand, more than 30-meter groundwater level decline can be registered in 2025. To foresee the combined effect of both natural and anthropogenic stresses on Addis Ababa city water supply sources, best case (considering conditions which improve Addis Ababa city water supply) and worst case (considering conditions stressing Addis Ababa city water supply) scenarios were tested. The best case scenario results zero unmet water demand in Addis Ababa city in most wet months of future projection years up to 2025, with likely decline of about 6 meter on the groundwater level. The worst case scenario to the contrary shows, Addis Ababa city water demand coverage will potentially be reduced to a maximum of 35% in 2025, with seasonal and annual variability. The dynamic link between surface water reservoirs and groundwater supply sources helps to gain insight into the potential consequences of continuously changing natural and anthropogenic conditions on Addis Ababa city water supply sources. Consequently, the significant predicted near future pressure on Addis Ababa city surface water and groundwater supply clearly indicate planning and developing alternative water supply sources outside of the boundary (Upper Awash basin) where the city is located should be immediately started in order to endure the pressure from the ever increasing demand. Otherwise, not only Addis will continue suffering unmet water demand for the years to come, but also the water supply sources will be severely impacted. Nonetheless, wherever the water supply sources, minimizing water loss, recycling and improving water use efficiency should be given at most priority.

To evaluate the regional water resources carrying capacity according to the importance of each related factor,we establish a model and sort out indicators that can characterize the ability of a region to provide clean water for its population. The water deficient ratio and utilization ratio of water resources are selected as the final evaluation indexes, which are of great practical value. We use the fuzzy membership function method, combined with the principal component analysis to construct a multi-index comprehensive evaluation index system.

Throughout the world, mountain populations have developed specific agroecosystems, with different types of water supply for irrigation and domestic use. The Drave mountain village (North Portugal) has, for centuries, faced harsh hydrological, hydrogeological, and hydropedological conditions. Since the second half of the twentieth century, the nature of water demand in Drave has drastically changed. The research objective is to understand the evolution of water demand and supply in the village of Drave, from the sixteenth century to the present day, and to present a possible solution to meet future water needs. A sampling network, comprising surface water and groundwater points, was established. Then, a sampling campaign took place in the dry season, and another one in the wet season. Laboratory analysis encompassed major inorganic ions, Potentially Toxic Elements, and microbiological parameters. Groundwater vulnerability to pollution was assessed through the DRASTIC index and GVTool, a Geographic Information System open-source application. Two historical periods were identified concerning the Drave water demand and supply: (i) from the foundation of the village until the second half of the twentieth century; (ii) from the mid-twentieth century on. The current scenario consists of using water resources with chemical and microbiological contamination to supply the needs of temporary inhabitants. Groundwater vulnerability to pollution ranges from extremely low to moderately low, with the most vulnerable areas corresponding to valley bottoms. A possible solution to meet the future water demand consists of abstracting and treating only surface water during the wet season and taking advantage of the hydrological regime of stream alluvial deposits during the dry season.

Triangle of Environment, Water and Energy: A Sociological Appraisal

Hydrological modeling and scenario analysis for water supply and water demand assessment of Addis Ababa city, Ethiopia

Linkage and driving mechanisms of antibiotic resistome in surface and ground water: Their responses to land use and seasonal variation

Large-scale water resources management within the framework of GLOWA-Danube. Part A: The groundwater model

The increasing number of dams built to address surface water problems has attracted the awareness of engineers about the impact of water in dams on surrounding groundwater levels. Some of the benefits of a dam include reducing peak flooding and storing excess water during the rainy season for use in the dry season. However, it is necessary to be aware that an increase in surface water in one place can have a negative impact on the surrounding environment. This paper describes the relationship between the water level in the dam and changes in the surrounding groundwater level. This study did not discuss the type of soil layer. The analysis was carried out by observing the level of the surrounding wells. Following Darcy’s law of homogeneous isotropic steady-state flow, as well as the principle of the double-well pumping test, the well water level is used as a groundwater representation level. This research was conducted in the sub-districts around the Pandan Duri Dam. The results showed that water levels inside the dam had a significant impact on the surrounding groundwater levels. This is evidenced in this research that water levels of wells in Sakra District significantly changes following the change in water levels inside the Pandan Duri Dam.

Groundwater, the term used for water occurring below the ground surface, is an important constituent of hydrological cycle and is the major source of water supply in various sectors. Due to over exploitation, mainly because of high population growth rates and extensive agricultural uses, there has been a growing concern about the water resources. For groundwater assessment and management it is essential to have a thorough understanding of complex processes viz., physical, chemical and/or biological occurring in the system. To understand these complexities groundwater model plays an important role. Groundwater models are simplified, conceptual representations of a part of the hydrologic cycle. They are primarily used for hydrologic prediction and for understanding hydrologic processes. During the last few decades there has been continuous improvement in the development of groundwater models. In the beginning groundwater models concentrated mainly on the flow behaviour in groudwater system while recent attempts are made to have full check on the water quality problem and to simulate the contaminant migration in groundwater. Now-a-days models range from simple twodimensional analytical groundwater flow models to complex three-dimensional numerical groundwater flow and solute transport models.

The conjunctive use of surface and subsurface water is one of the most effective ways to increase water supply reliability with minimal cost and environmental impact. This study presents a novel stepwise optimization model for optimizing the conjunctive use of surface and subsurface water resource management. At each time step, the proposed model decomposes the nonlinear conjunctive use problem into a linear surface water allocation sub-problem and a nonlinear groundwater simulation sub-problem. Instead of using a nonlinear algorithm to solve the entire problem, this decomposition approach integrates a linear algorithm with greater computational efficiency. Specifically, this study proposes a hybrid approach consisting of Genetic Algorithm (GA), Artificial Neural Network (ANN), and Linear Programming (LP) to solve the decomposed two-level problem. The top level uses GA to determine the optimal pumping rates and link the lower level sub-problem, while LP determines the optimal surface water allocation, and ANN performs the groundwater simulation. Because the optimization computation requires many groundwater simulations, the ANN instead of traditional numerical simulation greatly reduces the computational burden. The high computing performance of both LP and ANN significantly increase the computational efficiency of entire model. This study examines four case studies to determine the supply efficiencies under different operation models. Unlike the high interaction between climate conditions and surface water resource, groundwater resources are more stable than the surface water resources for water supply. First, results indicate that adding an groundwater system whose supply productivity is just 8.67 % of the entire water requirement with a surface water supply first (SWSF) policy can significantly decrease the shortage index (SI) from 2.93 to 1.54. Second, the proposed model provides a more efficient conjunctive use policy than the SWSF policy, achieving further decrease from 1.54 to 1.13 or 0.79, depending on the groundwater rule curves. Finally, because of the usage of the hybrid framework, GA, LP, and ANN, the computational efficiency of proposed model is higher than other models with a purebred architecture or traditional groundwater numerical simulations. Therefore, the proposed model can be used to solve complicated large field problems. The proposed model is a valuable tool for conjunctive use operation planning.

The extraction of mineral deposits is often associated with the occurrence of acid mine drainage (AMD), which can persist even after mine closure due to remaining sulfide minerals. This study investigates a 200-year-old abandoned mine and its impacts on nearby water resources. The study area is well known for Kuroko ore deposits located upstream of spring and river water resources. To elucidate the impacts of the abandoned mine site, mine water and spring and river water samples were collected, and their geochemical properties were monitored between 2021 and 2022. Groundwater, seepage, and surface water at the mine site showed AMD characteristics with Ca2+-SO42-/Mg2+-SO42- type. AMD-affected mine water showed a low pH range of 3.40-4.84, with elevated SO42- of up to 326mg/L. At the downstream of the mine site, one of the groundwater samples showed pH of 3.55 and average concentrations of 5.03mg/L of Al, 2.06mg/L of Cu, 2.06mg/L of Fe, 0.42mg/L of Pb, and 8.04mg/L of Zn, inferring the contaminant transport. Saturation indices of the mine water also indicated that the solubility controlling phases, anglesite, gibbsite, ferrihydrite, and jarosite influence the concentrations of Al, Fe, and Pb at the mine site. Meanwhile, spring and river water samples showed Ca2+-HCO3-, Ca2+-SO42-, and Na+-K+-HCO3- type with a circumneutral pH range of 5.59-8.02 and they were unaffected by AMD. The principal component analysis (PCA) of the spring and river water samples also showed higher loadings for Ca, Mg, NO3-, and Cl- reflecting the abundance of carbonate and evaporite minerals while the mine water and groundwater downstream showed higher loadings of Cl-, Fe, SO42-, and Zn. The results suggest that the past mining activities only influenced the mine site and groundwater downstream. Consequently, the fate and migration of contaminants in the downstream of the mine site should be evaluated in the near future.

The southeastern coastal area of Massachusetts (105 square miles) between Cohasset and Kingston is drained into Massachusetts Bay by several small rivers and coastal streams, including the North, South, and Jones Rivers. The major aquifers are stratified sand and gravel deposits of glacial origin. The yields from intercepted ground-water discharge and induced streamflow infiltration were determined for 21 major aquifers in the basin. Of these aquifers, 14 had a sustainable yield of at least 1.0 Mgal/d (million gallons per day) 80 percent of the time, and 10 had a sustainable yield of at least 1.0 Mgal/d 99 percent of the time. The two aquifers with the highest yields are the two aquifers with the greatest areal extent. The yields of the Duxbury Coastal and Kingston Coastal aquifers are 6.5 and 5.2 Mgal/d 80 percent of the time, and are 4.9 and 3.9 Mgal/d 99 percent of the time. Ground water was withdrawn from 14 of the aquifers for public supply in 1986; surface water was withdrawn in the recharge area of one of the other seven aquifers.

Water is prime natural resources fulfilling our needs in a precisious assets. We must acts to preserve and utilize every drop of water. Water resources can be assessed on the basis of surface and subsurface water bodies. Climate change impact on ground Water the impact of climate change on ground water has been studied much less than the impact on surface waters. Ground water reacts to climate change mainly due to change in ground water recharge, but also change in river level in response to increase in mean Temperature, precipitation ,variability and sea level as mean precipitations. Changing land use pattern due to increasing, urbanization, industrialization and agriculture activities are serious issues that causing increase ground water with drawal resulting in depletion of ground water resources and mining of ground water resources, along with deterioration of water quality. Rainfall is highly irregular and erratic and declining year to year due to change climatic conditions as result of serious deforestation global warming etc. Human health is affected by change in biodiversity and ecosystem. Climate change will affect the quality of drinking water and impact of fresh water availability and impact on public health. About 70% of Earth’s surface is water of which 97.5% is salty water and 2.5% is fresh water. Less than 1% of this 2.5% amount of freshwater is accessible. As sea water rise’s, salt water of ocean in filtrate as coastal fresh water due heavy rainfall and flooding waste more fertilizer and municipal sewage mixed with coastal fresh water and change alter into more oxygen dead zone. Weather extreme and climate variability is main driver of food production in recent global challenge. Recent global challenge food security, fresh water availability, increase incidence of extreme high sea level. Loss of agriculture reproduction and increase in food prices and changes in weather patterns and alter availability and quality of water in many part of world. Climate change is an on-going phenomenon. This will inevitably bring about numerous environmental problems, including alterations to the hydrological cycle, which is already heavily influenced by anthropogenic activity. Chemical fertlizer’s has been adversely affecting the flora, fauna as well as soil quality . more ever every year plant pathogen are causing loss of 10 to 20% of agricultural production world wide. Ground water will be vital to alleviate some of the worst drought situations. flooding and contaiminated water supplies, more intense weather events are likely to increase to risk of infectious disease epidemics and erosion of low-lying and costal land. Climate Chang will affect the quality of drinking Water and impact of fresh water availlablity and impact on public health it’s better to use UV Water purifiers. This paper will explore what climate change. Water is prime natural resources fulfilling our needs in a precisious assets.we must acts to preserve and utilize every drop of water. water resources can be assessed on the basis of surface and subsurface water bodies. Climate change imapact on ground Water the impact of climate change on ground water has been studied much less than the impact on surface waters. Ground water reacts to climate change mainly due to change in ground water recharge, but also change in river level in response to increase in mean Temperature, precipitation, variability and sea level as mean precipitations. Changing land use pattern due to increasing, urbanization, industrialization and agriculture activities are serious issues that causing increase ground water with drawal resulting in depletion of ground water resources and mining of ground water resources, along with deterioration of water quality. Rainfall is highly irregular and erratic and declining year to year due to change climatic conditions as result of serious global warming .Impacts of sea level rise on salinity intrusion global climate change has resulted in gradual sea level rise. sea level rise can cause saline water to migrate up stream in estuaries and rivers, thereby threating fresh water habitat and drinking- water supplies. Hydrology all the costal margin; fresh ground water flowing in land areas meets with saline ground water from the ocean. the fresh ground water flows from in land areas towards the coast where elevation and groundwater level are lower because salt water has higher content of dissolved salt and minerals. it denser the fresh water, causing it to have hydraulic head than freshwater. hydraulic head refers to the liquid pressure exerted by water column. the higher pressure density of salt water cause it to move into costal aquifiers in a wedge shape under the freshwater. the salt water and fresh water meets in a transition zone where mixing occurs through dispersion and diffusion.