Question is vague. Most would simply need to look at a river to determine that water - given a chance - will flow.
Doesn't even need a river. Get a glass, or a bottle of water. Tilt it, see what happens.
Maybe you're asking about the amount, or speed of water flow.
That's trickier. You can get an idea of speed simply by tossing something floating into the water and watch it move. Time it over a known distance, some simple math, and you get an answer in the unit of your choice.
Doesn't work that well on rivers though. Water likes to divide into layers. There might be a deeper layer moving either faster or slower.
water can flow at 200km per hour which is amazing! I know that is so cool!
It's not that they "know" there is an open circuit. It's that they can't flow. Imagine a hose with water in it. If you pinch the hose, water can't flow any more. An open circuit is like a pinched hose.
That's turbulent flow. I'd know it anywhere.
The jobs that will need to know about chlorine are jobs that deal with the water flow.
river
Flowing Water always flow downwards, and is always wet
water cannot flow uphill
As we know, whitewater rafting is in water, in which turbulent flow would be best in the case. Generally because the water will NOT be straight, and this activity is where the water flow is rather rough then smooth. Overall, turbulent flow is best used in this scenario.
the water aways flow because it does
a natural flow of water from underground
Most drillers have a good idea how much water will flow while drilling. If this is an older existing well, the only way is to conduct a 'controlled flow and recovery test' .Most drillers have a good idea how much water will flow while drilling. If this is an older existing well, the only way is to conduct a 'controlled flow and recovery test' .
They believe that it is from water flow.