Your search found 4 records
1 Wijewardena, J. D. H. 2001. Fertilizer and soil amendments use on potato in relation to soil fertility in rice based cropping systems of upcountry of Sri Lanka. Annals of the Sri Lanka Department of Agriculture, 3:353-363.
Soil fertility ; Fertilizers ; Dolomite ; Rice ; Potatoes ; Cropping systems / Sri Lanka / Badulla District / Uva Paranagama
(Location: IWMI-HQ Call no: P 7671 Record No: H039442)
2 Wijewardena, J. D. H. 2001. Effect of sources and levels of liming materials on soil acidity in ultisols of the upcountry. Annals of the Sri Lanka Department of Agriculture, 3:365-372.
Soil properties ; Dolomite ; Soil ph ; Acrisols ; Vegetables ; Organic fertilizers / Sri Lanka / Bandarawela
(Location: IWMI-HQ Call no: P 7671 Record No: H039443)
3 Desbarats, A. J.; Pal, T.; Mukherjee, P. K.; Beckie, R. D. 2017. Geochemical evolution of groundwater flowing through arsenic source sediments in an aquifer system of West Bengal, India. Water Resources Research, 53(11):8715-8735. [doi: https://doi.org/10.1002/2017WR020863]
Groundwater assessment ; Geochemistry ; Aquifers ; Flow discharge ; Arsenic compounds ; Chemical contamination ; Sedimentation ; Hydrogeology ; Organic carbon ; Minerals ; Calcite ; Dolomite ; Models / India / West Bengal
(Location: IWMI HQ Call no: e-copy only Record No: H048490)
(1.60 MB)
The source of geogenic arsenic (As) contaminating a shallow aquifer in West Bengal was traced to fine-grained sediments deposited in an abandoned river channel. Along with As-bearing phases, these sediments contain 0.46% codeposited organic carbon. The release of As and the geochemistry of groundwater within the channel-fill deposits is investigated using a detailed mass balance model supported by aqueous, solid-phase, and mineralogical data. The model describes the evolution of groundwater chemistry along a flow path extending from its recharge in an abandoned channel pond, through the channel fill, to the underlying aquifer. Variations in groundwater composition are explained in terms of mineral weathering of host sediments driven by organic carbon decay. Arsenic is released through the reductive dissolution of goethite and the weathering of chlorite. Concomitantly, some As is sequestered in precipitating vivianite. These competing processes reach equilibrium deeper in the channel-fill sequence as groundwater As concentrations stabilize. The model yields estimates of mineral reaction (or precipitation) rates including rates of organic carbon oxidation (1.15 mmol C L21 a21 ) and net As release (4:5731024 mmol L21 a21 ). Fine-grained, slightly permeable, deposits such as channel fill containing reactive organic carbon and As-bearing goethite and phyllosilicates are centers of intense chemical weathering conducive to As mobilization.
4 Cobbing, J. 2018. The North West dolomite aquifers, South Africa: a stalled opportunity for water security and development. Colombo, Sri Lanka: International Water Management Institute (IWMI). 20p. (Groundwater Solutions Initiative for Policy and Practice (GRIPP) Case Profile Series 03) [doi: https://doi.org/10.5337/2018.223]
Aquifers ; Groundwater management ; Groundwater level ; Groundwater extraction ; Water resources development ; Water governance ; Water user associations ; Water quality ; Water supply ; Water institutions ; Dolomite ; Public health ; Legal aspects ; Regulations ; Policy making ; Municipal authorities ; Local authorities ; Hydrogeology ; Stakeholders ; Farmers ; Costs
(Location: IWMI HQ Call no: e-copy only Record No: H048970)
(2 MB)
The karst dolomite aquifers of the North West Province in South Africa are among the most important in the nation. They serve as key water sources for municipal water supply and irrigation, and are also ecologically important in supplying springs that feed important rivers. Over-abstraction and consequent falling groundwater levels jeopardize water supply security, with increasing costs and risks to sustainable development. Better aquifer and conjunctive water management would improve water supply security and lower costs, with wider benefits to many sectors. This GRIPP Case Profile discusses these challenges and management experiences through the examples of two representative North West dolomite aquifers - the Grootfontein and Steenkoppies aquifers. These aquifers are relatively well understood hydrogeologically, and modern South African water law mandates sustainable use. Yet, underperforming collaboration between stakeholders using and managing the aquifers at various levels, and poor support from the national authority have led to an entrenched suboptimal equilibrium where stakeholders are reluctant to change behavior, despite awareness of the negative outcomes. Neither prescriptive local nor top-down organization has been effective. The synthesis argues for prioritized input from a legally mandated and capacitated convening authority (the national Department of Water and Sanitation) to catalyze and support effective local stakeholder groups and other governance initiatives. It calls for a renewed effort by this convening authority and other stakeholders, emphasizing mutually beneficial or “win-win” outcomes.
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