90 PSI is a bit high....you can check water flow (gallons per minute) by filling up a 5 gal bucket at full open and time it.
Channel flow is how much water flows through a channel.
question cannot be answered because it depends on the water pressure
That depends on the pressure behind the flow, and on the length of time the flow is allowed to continue.
10ppm of copper what mass of this rock must water flow. 10/10^6=2000/x=2E8 kg
about 16,000 tons flow through space and go on the edge of saturn atmmsphere
300 gallons per minute
As much as you want. But a larger quantity will take longer to pass through the hose.
Have to much water flow
300mm is a very low head, you can't expect much flow through that pipe, but you can work it out from the mechanical energy balance equation.
Depends on what's flowing (gas or water or something else) and under how much pressure.
In most there is a washer in them that has a small hole in it so that only so much water can get through regardless of how much pressure is behind it.
Not much of it. Much of the earth's waste is dumped into large holes and left to rote. This left for water to flow through it, and join up with water systems underground, which eventually join up large overland water systems as infected water.