ClimateChange Assessment Guide.pdf - University of Waterloo

Appendix E E-5Subwatershed 19 Case StudyThe northern portion of the subwatershed contains Upper Monora Creek, Middle Monora Creek and Lower MonoraCreek, which all drain into Island Lake Reservoir from the west. There are also two unnamed tributaries that draindirectly into the Island Lake Reservoir from the east. Outflow from Island Lake Reservoir at the South Dam marks thestart of the Credit River. Mill Creek joins the Credit River downstream of the South Dam, and the River continues toflow in a southward direction, to Lake Ontario. At the southern end of the subwatershed near Melville, three additionalunnamed tributaries located within the Town of Caledon discharge to the Credit River. The Melville Dam is located atthe downstream limit of Subwatershed 19.Land use within Subwatershed 19 includes various natural heritage features (wetlands, greenlands, etc) as well asurban areas, aggregate extraction areas and various other rural land uses. Figure 1-2 illustrates the land use withinthe subwatershed, (Credit Valley Conservation and EBNFLO Environmental, 2009).Figure 1-2: Existing land use within Subwatershed 19.The Towns of Orangeville and Mono rely on overburden and bedrock groundwater aquifers for all municipal watersupplies. Figure 1-3 illustrates the locations of municipal supply wells in the study area. Most of the Town ofOrangeville’s existing municipal supply wells are located within Subwatershed 19; however, one well (Mono CardinalWoods Well 3) is located in the Nottawasaga Watershed to the north, and two of the Town of Orangeville’s supplywells (Wells 6 and 11) are located south of the subwatershed within Shaw’s Creek Subwatershed (Subwatershed 17).