The Hydrological Response of Wetlands in Southern Ontario

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Abstract
The evaluation of wetlands in southern Ontario has been started by the Ontario Ministry of Natural Resources. This has heightened interest in the hydrological behaviour of wetlands. We present results of hydrological studies in Ontario of riverine, palustrine (upland), and isolated wetlands. Field results are sparse but tend to confirm the assumption made in the evaluation that the principal effect of wetlands on flowrate is the reduction and delay in peak flowrates. We demonstrate that recession of stored surface water in upland wetlands occurs within five days after input ends. Interaction between surface and groundwater flow is complex within palustrine wetlands. More field investigations are required, with an emphasis on groundwater studies. Hydrological models should be used to guide data collection and aid in the prediction of effects of changes in wetlands on the hydrology of the surrounding area.

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