By Ken Howard; Dubravka Pokrajac
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Extra info for Advanced simulation and modelling for urban groundwater management : UGROW
4), recharge distributions tend to be 6 Urban groundwater systems modelling extremely heterogeneous. Made ground effects are briefly considered above; here the discussion focuses on paving, buildings and discharge of waters. g. 4), paving of urban catchments is very much more extensive than in rural catchments. This encourages surface runoff and reduces direct infiltration. g. Cedergren, 1989). g. Kung, 1990), with almost no evapotranspiration and possibly only limited natural attenuation (Thomas and Tellam, 2006a).
A. 6 Study area: the Greater Toronto Area (GTA) showing component regions, existing urban centres and the Seaton Lands Source: After Howard and Maier, 2007 20 Urban groundwater systems modelling development is seen as an important test of the provincial government’s resolve to ensure that growth in the GTA is environmentally sustainable. Primary issues regarding these lands include the effects of development on the local water balance, the fate of sensitive wetlands, and the potential impacts of NaCl road de-icing salts on groundwater quality.
This will often result in changing the redox status from aerobic to anaerobic, or vice versa, with consequent effects for chemical reactions. For example, aerobic degradation of petroleum hydrocarbons may no longer occur, or anaerobic degradation may cease for chlorinated solvents. Robins et al. (1997) report a case where falling water levels induced oxygen influx, resulting in sulfide oxidation and the production of very high sulfate, low pH waters. Mixing: Wells may penetrate one or more plumes, and abstraction will thus cause within-well mixing.
Advanced simulation and modelling for urban groundwater management : UGROW by Ken Howard; Dubravka Pokrajac