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In order to permit your site,you will need to balance your desire to extract
power from the Water with adequate protection for the fish and plant habitate above and below the micro hydro generator site.
Unique ways to do this include diversion canals(leets), weirs, partial diversion dams, siphons and coanda's to draw
water downstream
Maine is covered with old mill sites that can be restored to produce energy from stored or falling water. Here are a few:
These are various coandas and stainless steel weirs which seperate out fish, debris, ice, etc. from a 'pipe'
of water that flows out the side. http://www.hydroscreen.com/products/hydro_turbine_diversion/index.html
   This is a well laid out, small micro hydro plant w/an impound.
  An on-site hydro site assessment is $150. Email or call for a blank form and details.
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There are many innovations depending on a client's water way, watershed, and habitat. These include filters for invasive
species, 'trash racks' for plastics and other debris; settling basins for silt and rock; leets for diverting water
from a stream; tidal barriers which hold back water until the tide drops enough to generate power.