Richmond Hill, Ontario - Geography and Climate

Geography and Climate

The predominant feature of the town's geography, as its name suggests, is its elevation above surrounding regions. Thousands of years ago during the last ice-age, glaciers moving in a southerly direction amassed a considerable amount of earth in front of them which they carried forward as they grew. Gradually, as the temperature increased the growth of the glaciers lessened and eventually they began to recede to what is now the polar ice cap. The earth that had been collected by the glacier's movement however was left in place and the elevated region that remained comprises modern day Richmond Hill.

The town itself is at a much greater elevation than other communities within the Greater Toronto Area (GTA) and with exclusion of areas closely alongside its borders, the constituent of York region with the greatest height above sea level. The uneven melting of the glacier that formed the town has led to an extremely varied geography within the town's own borders, leading to such features as kettle lakes, minor tributaries and most notably the Oak Ridges Moraine.

Kettle lakes are the result of glacier water getting caught in water-tight depressions in the land and are sustained by only rainfall in the immediate area. The Town of Richmond Hill has many of these water bodies and its three largest in order of decreasing size are Lake Wilcox, Bond Lake and Philips Lake. The kettle lakes are predominantly confined to the northern fringes of the town.

Being elevated above the surrounding region, precipitation in the town tends to flow outwards via the multitude of streams and rivers that flow through the town. Principally water flow is in one of two directions, south to Lake Ontario or north to Lake Simcoe where they join up with larger tributaries that feed into the water bodies. Of note, are the Rouge and Don rivers which receive some of their flow from sources in the town.

Perhaps the most important geographical feature of the Town of Richmond Hill is the Oak Ridges Moraine. The moraine is a further elevated region of loose soil which comprises a significant portion (roughly the northern third) of the land area of the town. Its porous nature allows the collection and natural filtering of waters that flow through it which are then fed into multiple underground aquifers. While the town receives its water from the City of Toronto, these aquifers are an important source for those with their own wells in addition to surrounding communities. The ability of the soil to hold so much water means that despite Richmond Hill's comparatively high elevation, it has a very high water table which poses some problems to construction. The moraine is also host to a staggering amount of biodiversity and in recent years there has been a considerable amount of pressure applied to government to shield the area from development. Consequently, a considerable portion of Richmond Hill is subject to the Ontario Government's Greenbelt legislation.