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.
Drainage divides (red lines) separating drainage basins (grey regions). A drainage divide, water divide, divide, ridgeline, watershed, water parting, or (in Canada) height of land, is the line that separates neighbouring drainage basins.n flat countryâespecially where the ground is marshy âthe divide may be harder to discern. A valley floor divide is a low drainage divide that runs across a valley, sometimes created by deposition or stream capture.