Used in weirs, hydraulic jumps etc
208248
What your actually thinking of are baffles. These cause the water to travel in a zig zag way or even perpendicular to flow direction. This slows the water by taking its Kinetic Energy and so reduces wear on other structures or machinery
161922
try this site http://www.irrigationtutorials.com/
457398
I've "witched" water before, but it is a questionable method.  I got 2 two foot long bronze brazing wires from a welder, bent them into equal sized "L"s....not everybody can do it, but you can try it over municipal water lines to see if it works for you.  I am a scientific person generally, but it does work...there is something to it.  be careful to hold them lose but level...go back and forth different directions...if you get a hit, try it from a different direction...don't let your sub-conscience mind take over and try to fool you.  there are times for me that I could not stop the crossing of the wires the indication was so strong.  The method is questionable because there is no depth meter on the wires and it could be anything, like differential density of the sub ground causing it...it could be water or something else.  I have heard of "witching" graves because of the differential density I suppose.
156577
It is used in plumbing particularly in car wash equipment.
314132
sometimes they are used for radio antennas
362780
It's a string that has a metal weight on one end (a plumb bob). It is hung by the other end, and the weight pulls it down so it makes a vertical reference line. It's used in construction to see that walls and objects are vertical.
650484
Able to be dissolved by water.
234170
use water with salt spray.
276994
wall jumps , jump more jumprope, anything that has to do with jumping
339792
The only way I can see this being done is to have a piston or other way to separate the water and air; otherwise, the air will simply bubble up through the water.\n\nAssuming there is a piston or other separation device and the water will overflow at the top, the initial pressure needed to begin the displacement of the water is the height of the water in inches  times its density in pounds per cubic inch. Taking the density of water as 62.4 pounds per cubic foot and converting to pounds per cubic inch the density becomes .036111. The height is of course 100 ft time 12 inches per foot or 1200 inches. This yields an initial pressure of 1200 time .036111 or 43.33 psi. As the piston moves upward, the required pressure will decrease directly in proportion to its height or .4333 psi per 12 inches of rise.
157768
They are used for bp.
605670
hmm! i think best way is to use a hacksaw. thanks for the 10 pts
26888
I know! The sport of using ur enviornment as an obstacle course. Urban freeflow all the way!
62344
wrap in tape and drop in water
310063
It would make water (H2O).
674682
some types of guns work underwater
249064
There is often a wide divergence between theory and application.  I remember one application where lengthy mechanical linkages and cables were used to transmit rudder position for a huge seagoing ship in the even that the steering gear room became flooded (and electronic indication was lost).  The system had too much lost motion to indicate rudder position even though it looked good in theory.  I suggested connecting a vertical rod to the rudders that pierced the overhead into the ("unflooded") compartment above which could be connected to a reliable electronic transmitter (similar to existing "flooded" transmitters) and that worked much better.  Even electronic control systems can exhibit unexpected hysteresis when built.