Your search found 5 records
1 Kubr, M.; Wallace, J.. 1983. Success and failures in meeting the management challenge. Washington, DC, USA: World Bank. 98p. (World Bank staff working paper no.585)
(Location: IWMI-HQ Call no: 658.4 G000 KUB Record No: H07168)
2 Falkenmark, M.; Klohn, W.; Lundqvist, J.; Postel, S.; Rockstrom, J.; Seckler, D.; Shuval, H.; Wallace, J.. 1998. Water scarcity as a key factor behind global food insecurity: Round table discussion. Ambio, 27(2):148-154.
Water scarcity ; Food security ; Food shortage ; Food production ; Rain-fed farming ; Yields ; Water use efficiency ; Crop production
(Location: IWMI-HQ Call no: P 4875, IIMI 333.91 G000 FAL Record No: H022336)
(0.95 MB)
3 Wallace, J.; Wouters, P. (Eds.) 2006. Hydrology and water law: Bridging the gap. London, UK: IWA Publishing. xi, 344p. (Water law and policy series)
Hydrology ; Water law ; Water policy ; Water rights ; Legislation ; Water resource management ; River basins ; Groundwater recharge / USA / Mexico / Australia / China / Ghana / Central Asia / Ecuador / Palestine / UK / New Zealand / Upper San Pedro River Basin / Great Lakes Basin / Lake Erie / Murray Darling Basin / Tarim River Basin / Panama Canal / Gatun Dam / Volta River Basin / Aral Sea Basin / Chaguana River Basin / Jordan River / Scotland / Motueka Catchment
(Location: IWMI-HQ Call no: 333.91 G000 WAL Record No: H038907)
4 McJannet, D.; Wallace, J.; Keen, R.; Hawdon, A.; Kemei, J. 2012. The filtering capacity of a tropical riverine wetland: I. Water balance. Hydrological Processes, 26:40-52.
Wetlands ; Water balance ; Water quality ; Hydrology ; Catchment areas ; Lagoons ; Nutrient balance ; Groundwater ; Rain ; Meteorological stations / Australia / Queensland / Great Barrier Reef lagoon
(Location: IWMI HQ Call no: e-copy only Record No: H045070)
(0.35 MB)
Wetlands in the coastal catchments adjacent to the Great Barrier Reef lagoon play an important role in local hydrological processes and provide important ecological habitats for terrestrial and aquatic species. Although many wetlands have been removed or degraded by agricultural expansion, there is now great interest in their protection and restoration as important aquatic ecosystems and potential filters of pollutant runoff. However, the filtering capacity of tropical wetlands is largely unknown, so the current study was established to quantify the water, sediment and nutrient balance of a natural riverine wetland in tropical north Queensland. Surface and groundwater fluxes of water, sediment and nutrients into and out of the wetland were monitored for a 3-year period. This paper focuses on the water balance of this natural wetland and a companion paper presents its sediment and nutrient balance and estimates of water quality filtering. Wetland inflows and outflows were dominated by surface flows which varied by 3–4 orders of magnitude through the course of the year, with 90% of the annual flow occurring during the period January to March. Although groundwater inputs to the wetland were only 5% of the annual water balance, they are very important to sustaining the wetland during the dry season, when they can be the largest input of water (up to 90%). Water retention times in this type of wetland are very short, particularly when most of the flow and any associated materials are passing through it (i.e. 1–2 h), so there is little time to filter most of the annual flux of water through this wetland. Longer retention times occur at the end of the dry season (up to 8Ð5 days); but this is when the lowest fluxes of water pass through the wetland.
5 McJannet, D.; Wallace, J.; Keen, R.; Hawdon, A.; Kemei, J. 2012. The filtering capacity of a tropical riverine wetland: II. Sediment and nutrient balances. Hydrological Processes, 26:53-72. [doi: https://doi.org/10.1002/hyp.8111]
Wetlands ; Sedimentation ; Water quality ; Water balance ; Groundwater ; Surface water ; Lagoons ; Catchment areas / Australia / Queensland
(Location: IWMI HQ Call no: e-copy only Record No: H045071)
(3.89 MB)
The ability of wetlands to improve the quality of water has long been recognized and has led to the proliferation of wetlands as a means to treat diffuse and point source pollutants from a range of land uses. However, much of the existing research has been undertaken in temperate climates with a paucity of information on the effectiveness of wetlands, particularly natural wetlands, in tropical regions. This paper contributes to addressing this issue by presenting a comprehensive measurement based assessment of the potential for a naturally occurring tropical riverine wetland to improve the quality of the water entering it. We found small net imports and exports of sediment to/from the wetland in individual years, but over the longer term this kind of wetland is neither a sink nor source of sediment. In contrast, phosphorus was continually removed by the wetland with an overall net reduction of 14%. However, it should be noted that there is no ‘permanent’ gaseous loss mechanism for phosphorus, and its removal from the water column is equal to its accumulation in the wetland soil. We found very little removal of nitrogen by this type of wetland from several analyses including: (i) Surface and groundwater fluxes, (ii) Estimation of water column and soil denitrification rates, (iii) Wetland residence times, and (iv) Hydraulic loading. We also found no clear evidence for transformation of nitrogen to more or less bio-available forms. Hence, while the benefits of using wetlands to improve water quality in controlled environments have been demonstrated in the literature, these benefits may not always be directly translated to unmanaged natural wetland systems when there is strong seasonality in flows and short residence time during the periods of maximum sediment and nutrient load.
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