Evidence of increasing temperatures, lower precipitation, and greater evaporation have already been noticed in many places of Canada. The graph given below, left, is the modeled evaporation for eastcentral Alberta from 1960 to 2099.
The picture below, right, shows a stream in the Experimental Lakes Area (ELA) of Ontario that was previously permanent, meaning that it flowed year-round. An increase in average summer air temperature from 14 to 16 °C at the ELA between 1970 and 1990 caused many permanent streams to become ephemeral, meaning that they only flow during certain times of the year. This stream is the outflow of Lake 239.
Modeled evaporation for eastcentral Alberta from 1960 to 2099
An ephemeral stream that only flows during parts of the year