| Summary: | <p>The Rivers area is located in southwest Manitoba between
49°53' and 50°09' North Latitude and 100°04' and 100°29' West Longitude.
The average precipitation is about 19 inches, and the mean annual temperature is about 35ºF.</p>
<p>The surficial sediment is glacial drift. It overlies the
Riding Mountain Formation throughout the area. A large aquifer bearing
artesian water, containing about 2000 ppm. total dissolved solids,
mainly sodium sulphate, occurs in the northwest part of the area beneath
till and overlying or near the surface of the bedrock. Intratill sands
and gravels in the north half of the area yield limited quantities of
water of various qualities, ranging up to 4000 ppm. total dissolved
solids, mainly calcium-magnesium sulphate. A large outwash delta occurs
in the south central part of the area. It yields good quality water in
generally minor quantities. Its water contains typically less than
500 ppm., mainly calcium-magnesium bicarbonate. Some of the delta water
collects in the fluvial deposits in the north side of the Assiniboine
River valley, just south of the delta where this water is presumably
available in larger quantities.</p>
<p>The Assiniboine and Minnedosa River waters generally contain
between 600 and 1000 ppm. total dissolved solids, but may drop to as low
as 370 in April and May. The main constituents are
calcium-magnesium sulphate and calcium and magnesium bicarbonate. Water
quality fluctuations observed in the Assiniboine and Minnedosa River
waters as well as in one groundwater well, appear to indicate that
recharge to groundwater from snowmelt begins in late January and February.</p>
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