How can the water crisis be solved? Lesson Objective: Know examples of water management at different scales Consider the costs and benefits of the Hoover dam on the river Colorado Examine the role of a small scale intermediate technology project

Large Scale Management Water has been managed to give reliable water supplies to people The Hoover dam, Colorado The river Colorado is one of the most managed rivers in the world, it feeds the needs of 7 US states and Mexico.

The drainage basin for the river Colorado shows the scale of the river.

Hoover Dam The river is a primary source of water to a region that receives little annual rainfall Water management projects have smoothed out the flood peaks through the construction of reservoirs and dams The HOOVER DAM 1935, stores the equivalent of 2 years river flow in Lake Mead The Glen Canyon Dam followed in 1963, the 2 lakes store water and feed cities like Las Vegas

The river Colorado regime

Activity Read over all of the information in your booklet highlight the key points Use 2 colours to shade in positives and negatives of the river Colorado being managed

Impacts of the management A young member of the Cocopah Indians of northern Mexico plays in a dried-up arm of the Colorado River near the town of El Mayor, Mexico. The Colorado River, on which the Cocopah people fished and farmed for about 2,000 years, is often drained dry by upstream demand before reaching this part of Baja, California.

Small Scale Management Options 1 Afridev hand pump, Chessa village, Tanzania

Rain water harvesting Option 2

What do you think intermediate technology is?

Small Scale Management

What is the solution, large or small scale? Think SUSTAINABILITY

Practice makes perfect Complete the exam style questions I and J on page 14. Self assess and give your self a mark for each question