Are you talking about Spate irrigation???
http://en.wikipedia.org/wiki/Spate_irrigation
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Originally Posted by MtnGoat
OK I can't remember for the life of me what kind of irrigation system/dam this is called. So I will try my best to discribe it. I thought I had it in my 18C MOS Book but didn't.
You use them mainly on ditches or run out streams, dry river/creek beds that fill with water when it rains in high Elevations. YOu can use them on Small Streams and Rivers too.
I'm basically looking for one in a dry creek bed that gets water, not really flash floods. But fills when it rain or rain comes down a hill/mountain side. Like you live down in a valley and you can see it rain up in the mounatins. You know by morning or with XX set of hours you will have rain coming down your creek/stream.
How the Dam or irrigation system works is you build three "walls" in a semi-circle. Each wall is seperated by a set distance due to the amount of water typically running down/along the creek/stream. The height of each wall is different based on the same factors. The first wall starts to slow the water down, second wall slows the water down to a stop spilling over into the third walled area. The third walled area spills back into the stream/creek to flow down stream. If there isn't that much water it still "catches" water to be used in the area.
There is a name for this kind of irrigation system or Dam system. That's what I'm looking for so I can google it. The measuremeants are base off river/creek size or amount of water flowing. Maybe stream velocity, etc. I know this is some Redneck Engineering, but it has a real name.
Looking for some help. Thanks 
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There is only one tactical principal which is not subject to change. It is to use the means at hand to inflict the maximum amount of wounds, death and destruction on the enemy in the minimum amount of time.
Gen. George S. Patton, Jr.
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