This is an excellent article on water intakes and filtration by Jerry Ostermeier of Alternative Power . The article is reprinted with permission of 2008 Home Power Inc. www.homepower.com.

Many examples are given as to how to build and filter your penstock supply and the author has also graciously agreed to this re-print.

Another good article in the same magazine by the same author is called "Hydro Penstock"in the June no. 125 issue. It discusses in detail how to plan you micro-hydro intake or penstock, including thrust blocks for pipe supports, choice of materials, air relief, etc. You can get this article on the Home Power web site with a subscription fee.