![]() By establishing integrated protected area networks, we’re working towards a sustainable future for the UAE’s people and nature. So Emirates Nature-WWF is partnering with government, business and communities to deliver achievable solutions. It’s a situation no one can take lightly if we want to maintain our lifestyles and protect the abundance of wildlife living around our freshwater sources. Desalination is also environmentally treacherous – affecting marine life and contributing to climate change. Dams have severe effects on wildlife areas, creating droughts and upsetting the balance of nature. Unfortunately these solutions pose their own threats to the environment. Several dam building and desalination programmes have been implemented to combat the looming water shortages. But there has also been a drop in supply – climate change, low rainfall, high evaporation, over-exploitation of groundwater for agriculture, and the maintenance of artificial gardens, parks and forests are all taking their toll. This is partly due to a rapid rise in demand from urbanisation and population growth. Today, most of our water is being provided by desalination. Thirty years ago, all of our freshwater requirements were satisfied by natural sources. Instead, we rely heavily on rainwater falling in the Hajar Mountains – creating year-round water in the wadis and underwater gorges. We have no permanent rivers or natural lakes. Very few countries have freshwater supplies that are so scarce and fragile as the UAE’s. And humans need it for almost everything – from the food we eat to our fuel, clothes and medicine. The provincial record is held by the Churchill River in central Labrador which discharges an average of almost 2000 cubic metres per second in June.Every living creature’s survival depends on it. However, similar to other large rivers around the world, the Yangtze is also confronting a severe water crisis. In May, the month of maximum discharge in the Gander River (in central Newfoundland), the mean discharge is more than 250 cubic metres per second. John's, the capital of Newfoundland and Labrador, drains a small basin and the mean rate of flow in April is less than 5 cubic metres per second. The Waterford River, that runs through St. The volume of water discharged by a stream is also affected by the size of the drainage basin. In central and southern parts of the island, where precipitation can fall as rain during the winter, the winter streamflow minimum is less marked than the summer minimum. ![]() In Labrador and the northern parts of the island where winters are long and severe, this is the season of minimum streamflow. In winter, when temperatures fall below freezing and precipitation falls as snow, no surface water reaches the streams and flow decreases again. ![]() Soon the soil holds as much water as it can (it is saturated), and the surplus reaches the streams whose flow increases. With the approach of fall evapotranspiration decreases, and in the southern part of the island precipitation increases. Man-made reservoirs on dammed streams function like natural lakes to reduce peak run-off and maintain flow during the summer. Lakes in a streams's course store some of the spring run-off and help to maintain flow as do springs fed by groundwater. Although stream flow is low during the later part of the summer, streams rarely dry up completely. Farmers and gardeners know that the soil is much drier in summer than in spring or fall this is the result of high evapotranspiration during the growing season and means that very little of the rain that falls in summer reaches a stream. Evapotranspiration is at a maximum in summer, when temperatures are higher and plants are growing strongly. Stephenville Integrated High School Projectĭuring the later part of the summer and the fall streamflow is related to the balance between precipitation and evapotranspiration.Une série de documentaires (en français). ![]()
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