That would depend on local codes and the fixture demands
The minimum size for service pipes typically depends on local building codes and the intended use of the system. For residential water service, a common minimum size is 3/4 inch in diameter, while for gas service, it may vary based on the load requirements but often starts at 1 inch. It's crucial to consult local regulations and standards to ensure compliance with specific requirements.
50 choice 2
you need to figure out how much water per minute you need and get the minimum pipe diameter that will give you that. the bigger they are the more expensive they are, on a logaritmic scale.
10 centimeters/second
If it is roof drains you are talking about, this calculator may help you: http://www.portalsplus.com/drain_calc.htm
Diameter of water fog:less dan or equal to 50um
Ball valve is usually preferable. full flow with no restriction and a lot easier and faster to turn off when needed.
The diameter of a typical drop of water is approximately 2-4 millimeters.
Only circles (or spheres) have a diameter
To increase the pressure you would have to reduce the diameter of the pipe. Half the diameter would give you twice as much pressure. Therefore to get 25 percent more pressure you would reduce the diameter by 25 percent giving you 37.5. Be careful though, this only increases the water pressure not the water flow rate.
Length x Width and then Pitch with a minimum of 2" diameter and it is called a STORM drain as no one really wants to just let potable water run down a drain constantly as it can be quite expensive
There are two water temperatures, incoming and lake temp. On Friday, 6/15/12 water incoming water temp was 63 degrees. Air temp was 86 degrees