Your search found 11 records
1 Kuffour, A. R.; Awuah, E.; Anyemedu, F. O. K.; Strauss, M.; Kone, D.; Cofie, Olufunke. 2009. Effect of using different particle sizes of sand as filter media for dewatering faecal sludge. Desalination, 248(1-3):308-314. [doi: https://doi.org/10.1016/j.desal.0000.00.000]
Sewage sludge ; Dewatering ; Filtration ; Filters ; Sand ; Nutrients ; Effluents ; Pollution control
(Location: IWMI HQ Call no: e-copy only Record No: H042720)
This research is aimed at investigating the effect of different particle sizes of sand for the dewatering of faecal sludge with respect to the dewatering time, contaminant load in the percolate, rate of clogging and quantity of biosolids produced. Three filter media FM1, FM2 and FM3 were used to dewater the faecal sludge. The experiment was conducted on bench scale consisting of miniature drying beds. Six cycles of dewatering were run where FM1, FM2, and FM3 showed average dewatering times of 10, 10 and 9 days respectively without significant differences (p > 0.05). However the percolate quality showed significant differences between them in the removal of TS, TVS, SS, COD, DCOD and NH3-N with FM1 having the highest removal for each parameter. Accumulation of organic matter in the top 10 cm of the filter bed indicated that FM1 was least likely to clog and it also generated the highest quantity of biosolids.
2 Jinapala, K. 2005. NARBO workshop participants’ Study tour to tail end part of Maha Oya on 27 of April 2005. In Network of Asian River Basin Organisations. Second NARBO Training Workshop on River Basin Management and Organisations for Mid-Career Professionals in South Asian countries held at The Beach Hotel, Negombo, Sri Lanka, 24-29 April 2005. Manila, Philippines: Network of Asian River Basin Organizations (NARBO). 7p.
(Location: IWMI-HQ Call no: e-copy only Record No: H044688)
(0.55 MB)
3 Ratnayake, R. (Comp.) 2008. River sand mining - boon or bane?: a synopsis of a series of national, provincial and local level dialogues on unregulated/illicit river sand mining. Colombo, Sri Lanka: Sri Lanka Water Partnership (SLWP). 14p.
(Location: IWMI HQ Call no: 622.3622 G744 RAT Record No: H045613)
(3.68 MB)
4 Gomez, G. E. M.; Kodippili, A. A. 1998. An assessment of water resources in Kelani, Kalu and Maha Oya River Basins. Final report prepared for the Sri Lanka Water Resources Secretariat. 87p.
Water resources ; Water management ; River basins ; Hydrology ; Groundwater resources ; Water quality ; Water supply ; Water requirement ; Water balance ; Water availability ; Water use ; Water rates ; Irrigation ; Water power ; Flow discharge ; Social aspects ; Sand ; Deforestation ; Downstream ; Upstream / Sri Lanka / Kelani River Basin / Kalu River Basin / Maha Oya River Basin
(Location: IWMI HQ Call no: 333.91 G000 GOM Record No: H046034)
(1.03 MB)
5 Lanka Jalani; Capacity Building Network, Sri Lanka (CapNet); Network of Women Professionals, Sri Lanka (NetWWater) 2006. Proceedings of the National Dialogue on River Sand and Clay Mining, Sri Lanka Foundation Institute, Colombo, Sri Lanka, 24 April 2006. Colombo, Sri Lanka: Lanka Jalani; Capacity Building Network, Sri Lanka (CapNet); Network of Women Professionals, Sri Lanka (NetWWater). 53p.
Rivers ; Sand ; Clay ; Mining ; Economic aspects ; Costs ; Labour costs ; Environmental effects ; Social aspects ; Sustainability ; Governmental interrelations ; Living standards ; Legal aspects / Sri Lanka / Maha Oya
(Location: IWMI HQ Call no: 622.3622 G744 LAN Record No: H046178)
(0.48 MB)
6 Pereira, K.; Ratnayake, R. 2013. Water integrity in action: curbing illegal sand mining in Sri Lanka. Berlin, Germany: Water Integrity Network (WIN). 36p.
Sand ; Sand dunes ; Clay ; Mining ; Legal aspects ; Rivers ; Water supply ; Erosion ; Riverbank protection ; Environmental effects / Sri Lanka / Deduru Oya / Maha Oya
(Location: IWMI HQ Call no: 622.3622 G744 PER Record No: H046318)
http://www.waterintegritynetwork.net/index.php?option=com_mtree&task=att_download&link_id=174&cf_id=61
https://vlibrary.iwmi.org/pdf/H046318.pdf
https://vlibrary.iwmi.org/pdf/H046318.pdf
(5.66 MB) (5.66 MB)
7 International Water Management Institute (IWMI). 2014. Around the well: news, views and discussion on water and the environment in Sri Lanka. Around the well: news, views and discussion on water and the environment in Sri Lanka, 1. 8p. [doi: https://doi.org/10.5337/2014.217]
Sand ; Mining ; Lagoons ; Aquaculture ; Disaster prevention ; Flooding ; Wholesale marketing ; Farmers / Sri Lanka
(Location: IWMI HQ Call no: IWMI Record No: H046589)
(1.40 MB)
8 Gunawardena, J.; Muthuwatta, Lal; Fernando, M. J. J.; Rathnayake, S.; Rodrigo, T. M. A. S. K.; Gunawardena, A. (Eds.) 2015. Proceedings of the First International Symposium on Environment Management and Planning, Battaramulla, Sri Lanka, 23-24 February 2015. Colombo, Sri Lanka: Central Environmental Authority (CEA). 55p.
Environmental management ; Forest plantations ; Drug plants ; Tea ; Rubber industry ; Agroforestry ; Biodiversity ; Wildlife ; Freshwater ; Water quality ; Groundwater pollution ; Water deficit ; Land use ; Paddy fields ; Constructed wetlands ; Carbon ; Meteorology ; Models ; Satellite surveys ; GIS ; Remote sensing ; Maps ; Soil salinity ; Erosion ; Sand ; Solar radiation ; Watersheds ; Aquifers ; River basins ; Tanks ; Energy generation ; Bioremediation ; Waste management ; Performance evaluation ; Toxic substances ; Pollutant load ; Noise pollution ; Denitrification ; Leachates ; Biofertilizers ; Aquatic insects ; Food production ; Fishing ; Farmers ; Vegetable growing ; Vermicomposting ; Health hazards ; Malaria ; Case studies ; Arid zones ; Coastal area ; Coral reefs / Sri Lanka / India / Tangalle / Vavuniya / Jaffna / Killinochchi / Mullaitivu / Mannar / Kalpitiya / Colombo / Kalutara / Matara / Weligama / Badulla / Upper Mahaweli Catchment / Paraviwella Reef / Vairavapuliyankulam Tank / Kelani River / Himalayan Region
(Location: IWMI HQ Call no: IWMI Record No: H046899)
(1.32 MB)
9 Baker, Tracy; Kiptala, J.; Olaka, L.; Oates, N.; Hussain, Asghar; McCartney, Matthew. 2015. Baseline review and ecosystem services assessment of the Tana River Basin, Kenya. Colombo, Sri Lanka: International Water Management Institute (IWMI). 107p. (IWMI Working Paper 165) [doi: https://doi.org/10.5337/2015.223]
Ecosystem services ; Assessment ; River basins ; Land cover ; Land use ; Land management ; Pastoral lands ; Highlands ; Living standards ; Farmland ; Small scale farming ; Rainfed farming ; Coastal area ; Biodiversity conservation ; Soils ; Climate change ; Floodplains ; Flooding ; Surface water ; Sedimentation ; Natural resources ; Infrastructure ; Groundwater recharge ; Wetlands ; Forests ; Eucalyptus ; Dams ; Irrigation schemes ; Sand ; Mining ; Charcoal ; Livestock production ; Socioeconomic environment ; Water power ; Energy generation ; Food security / Kenya / Tana River Basin
(Location: IWMI HQ Call no: IWMI Record No: H047535)
(4 MB)
The ‘WISE-UP to climate’ project aims to demonstrate the value of natural infrastructure as a ‘nature-based solution’ for climate change adaptation and sustainable development. Within the Tana River Basin, both natural and built infrastructure provide livelihood benefits for people. Understanding the interrelationships between the two types of infrastructure is a prerequisite for sustainable water resources development and management. This is particularly true as pressures on water resources intensify and the impacts of climate change increase. This report provides an overview of the biophysical characteristics, ecosystem services and links to livelihoods within the basin.
10 Ashraf, M.; Bhatti, Muhammad Tousif; Shakir, A. S. 2016. River bank erosion and channel evolution in sand-bed braided reach of River Chenab: role of floods during different flow regimes. Arabian Journal of Geosciences, 9(2):1-10. [doi: https://doi.org/10.1007/s12517-015-2114-y]
Riverbank protection ; Erosion control ; Flooding ; Landsat ; Imagery ; Sand ; Open channels ; Monsoon climate ; Flow discharge ; Stream flow ; Environmental protection / Pakistan / Chenab River
(Location: IWMI HQ Call no: e-copy only Record No: H047488)
(5.03 MB)
Braided reaches of large rivers in alluvial plains show major morphological changes, particularly the external bank erosion, due to the flood events. This paper highlights the bank erosion and channel evolution induced by eleven different flood events in a 7-km long reach of the River Chenab, Pakistan. The impact of floods on river bank erosion and channel evolution is analyzed under low and high flow conditions. Flood-induced changes, for river’s external banks and channel evolution, were assessed by processing Landsat ETM+ images in ArcGIS tool, and their inter-relationship is evaluated through regression analysis. The results revealed that the major morphological changes were triggered by the flood events occurred during the high flow or Monsoon season (July–September), whereas the flood events of similar magnitude occurring during low flow season (October–March) did not induce such changes. Mostly, the erosion remained limited to the middle part of the reach,where the branch channel flows along the bank. The average annual bank erosion rates are much higher as compared with a global scale. Data analysis showed a strong correlation between the mean high flows and total bank erosion indicating that Monsoon seasonal flows and floods are responsible for bank erosion. The present study further identifies the river bank locations highly susceptible to erosion by developing the correlation between bank erosion and branch channel progression. Strong correlation for bank erosion could be established with the shift of branch channels position flowing along the banks in braided reaches of sand bed rivers. However, the presence of sand bars along the river banks resulted in reduced erosion that weakens this relationship. The findings of the present study can help develop better understanding about the bank erosion process and constitute a key element to inform and improve river bank management.
11 Ghosal, U.; Sikdar, P. K.; McArthur, J. M. 2015. Palaeosol control of arsenic pollution: the Bengal Basin in West Bengal, India. Groundwater, 53(4):588-599. [doi: https://doi.org/10.1111/gwat.12251]
Groundwater ; Arsenic ; Contamination ; Water pollution ; Water quality ; Palaeosols ; Sand ; Clay ; Aquifers ; Manganese ; Health hazards ; Hydrogeology ; Models ; Wells ; Drilling / India / West Bengal / Bengal Basin
(Location: IWMI HQ Call no: e-copy only Record No: H047963)
http://onlinelibrary.wiley.com/doi/10.1111/gwat.12251/epdf
https://vlibrary.iwmi.org/pdf/H047963.pdf
https://vlibrary.iwmi.org/pdf/H047963.pdf
(2.35 MB) (2.35 MB)
Groundwater in the Bengal Basin is badly polluted by arsenic (As) which adversely affects human health. To provide low-As groundwater for As mitigation, it was sought across 235 km2 of central West Bengal, in the western part of the basin. By drilling 76 boreholes and chemical analysis of 535 water wells, groundwater with <10 µg/L As in shallow aquifers was found under one-third of a study area. The groundwater is in late Pleistocene palaeo-interfluvial aquifers of weathered brown sand that are capped by a palaeosol of red clay. The aquifers form two N-S trending lineaments that are bounded on the east by an As-polluted deep palaeo-channel aquifer and separated by a shallower palaeo-channel aquifer. The depth to the top of the palaeo-interfluvial aquifers is mostly between 35 and 38 m below ground level (mbgl). The palaeo-interfluvial aquifers are overlain by shallow palaeo-channel aquifers of gray sand in which groundwater is usually As-polluted. The palaeosol now protects the palaeo-interfluvial aquifers from downward migration of As-polluted groundwater in overlying shallow palaeo-channel aquifers. The depth to the palaeo-interfluvial aquifers of 35 to 38 mbgl makes the cost of their exploitation affordable to most of the rural poor of West Bengal, who can install a well cheaply to depths up to 60 mbgl. The protection against pollution afforded by the palaeosol means that the palaeo-interfluvial aquifers will provide a long-term source of low-As groundwater to mitigate As pollution of groundwater in the shallower, heavily used, palaeo-channel aquifers. This option for mitigation is cheap to employ and instantly available.
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