If you're thinking about buying a retractable awning, consider the value, longevity and cost. Purchasing a retractable deck awning is a big investment. While smaller, less-expensive awnings start at around $500, larger, higher-quality awnings can cost as much as $2,000 or more. Before you make the decision to buy a retractable awning, you should learn as much as possible about their benefits and drawbacks. Here are the top three pros and cons to consider.
Drainage basin. 558 pages on this wiki. A drainage basin is the area within the drainage basin divide (yellow outline), and drains the surface runoff and river discharge (blue lines) of a contiguous area.rainage basin. 558 pages on this wiki. A drainage basin is the area within the drainage basin divide (yellow outline), and drains the surface runoff and river discharge (blue lines) of a contiguous area.
They are also known as drainage divides because they divide the river system or river basins from other river systems. A watershed is also a term that is being used in the North American region to refer to a water basin which is smaller in size and flows into a smaller outlet such as a stream or wetland.atersheds are considered part of a water basin. In other regions of the world, watersheds are the drainage divides that cut through a river system. While both a river basin and a watershed are land forms, they have different functions in our ecology.