The water cycle describes how water evaporates from surfaces into clouds, condenses back into liquid when temperatures decrease, and returns to the surface as rain. Water is treated and stored in reservoirs and tanks before being distributed to homes, where it is used for washing, drinking, and other purposes. After use, wastewater undergoes treatment to remove contaminants before being released into rivers.

1. Water Cycle The water evaporates from the rivers, seas, lakes and forms clouds. When the temperature decreases the water vapor becomes liquid and rain occurs. Water returns to the surface.

2. Resevoir – El Gergal A part of the water can be stored in a reservoir.

10. Measures to conserve water