Dave Liquorice wrote in message
ll.com...
On Wed, 15 Mar 2006 23:03:59 GMT, Mark wrote:

Agreed, the Environment Agency recommend when the bottom silt content
reaches 25% of volume.

How does one measure the bottom silt content?


long pole ;(
http://www.ext.nodak.edu/extpubs/age...u/ae892-27.gif


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