what grade would a 4" drain pipe 40 feet long require
324inches, or 27 feet
This would require an area of 269.1 square feet.
Yes, it would.
8.88 inches
== == The grade of a hill is measured as a percentage in the United States. This is simply the slope of the hill written in percent form. For example, if you have a hill that drops 200 feet over one mile (5280 feet) the grade would be 200/5280 = 0.0379, or a 3.8% grade.
1% = 1/100 means 1 inch drop over 100 inches of drain pipe that is slightly more than 8 feet 1 in drop over 8 ft 4 in
No, it does not drain. The top so many feet act as a reservoir.
absolutely
It would require 74,530 US gallons of water.
This would be rise over run. I don't think I can explain why. Tangent
If you have a 2 percent grade over a distance of a mile, the vertical change is 105.6 feet. A half a mile is 52.8 feet.
well there is really no right grade to be in when you are a certain height