Demand

Date: 

1 Jun 2013

Author: 

Ted van der Gulik, Denise Nielson, Ron Fretwell, Stephanie Tam

Publisher: 

BC Ministry of Agriculture, Agriculture and Agri-Food Canada

Thinking About Water

By Rodger Hunter, Cowichan Watershed Board, December 19, 2010

With the rainy season squarely upon us maybe it an appropriate time to review some facts the essence of life.

Let’s start with the big picture and move from global to local.

So how much water is there on the planet?

Earth isn’t called the Blue planet for nothing. The United Nations Environment Program reports the there are 1.4 billion cubic kilometres of water on Earth.

Is the amount of water increasing or decreasing?

Supply and Demand

Water in the Cowichan Basin

The Cowichan Watershed can be characterised as having high precipitation/recharge, high storage, and low population/demand in the western and upper half of the watershed, contrasted with low precipitation, low storage, and high population/demand in the eastern and lower half. Supply and demand are not matched regionally, nor seasonally, and the supply-demand gap is pushed to extremes in the late summer and early fall.

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