Stairs Calculation
Surface Drainage for surface water and foul water
The two main places where surface water gathers are the roof and paved areas. Surface water has become more of a problem in recent years due to the increasing number of homes being built in urban areas. Siting buildings on previously undeveloped land means that the land absorbs less water than it would if there were no buildings, and this in turn increases the volume of surface water. Why I chose this system was because foul water is directed into the sewer system and piped to a treatment plant as it is soiled. The surface drainage will run off water which is kept clean so it is kept separate. It could possibly be stored in an underwater storage tank and reused for non sanitary purposes if the correct filters are used to clean the water of leaves and dirt. This system can be used for flushing toilets, watering plants etc but cannot be used for showers or tap water.
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