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Gabion weir/dam

 
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Location: Hazel Green, Alabama
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I'm new to the forum and was hoping to get some advice or links to resources. I have a relatively flat Creek 20 ft wide and I'm wanting to build a gabion weir across it to build up enough head to run a small ram pump. The creek has a solid stone bottom and is normally 6-8 inches deep but floods occasionally. Is there any sort of rule of thumb or math i need to do for sizing the drain pipe. I've already checked local laws and there is no issue with building it as long as its under 4ft tall and i don't stop the flow of water off of the property or cause flooding upstream. Any other advice on construction would be appreciated. Thank you
 
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solar wood heat
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Here are somethings dam builders are going to want to know:
  -what is the topology of your land along the stream (relatively flat could mean feet and those few feet difference on your property might mean alot for head);
  -the topology of the your land will also give insight into the natural dips and highs that could prove useful in retaining water;
  -what types of material do you have on your land (sand, clay, rock, percentages);
  -how fast is the flow of the stream?
  -finally, consider the ramifications of your dam breaking (how to slow down a small tidal wave).

Good luck!
 
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