There is tons of information available on the web. Google "riparian buffer" , "wetland restoration", and "constructed wetland". Most is geared towards wastewater treatment but the technique is the same for establishing a "balanced" aquatic ecosystem.
There's a book I've used at work titled "Constructed Wetlands for Wastewater Treatment; Municipal, Industrial, and Agricultural" edited by Donald A. Hammer. ISBN 0-87371-184-X. Lewis Publishers Inc., 121 South Main Street, Chelsea Michigan, 48118.
My copy is almost 20 years old now, but I'm sure more current volumes are available.
Also check with the Natural Resources Conservation Service (NRCS), an agency of the USDA. We work with them all the time where they provide techical assistance in design and construction. Your local county office should be listed in the Blue Pages under USDA Service Centers. Or on-line at:
Natural Resources Conservation Service
If you live on a farm you may be eligible for cost-shares for installing a raparian buffer or developing suitable wildlife habitat through the USDA Farm Service Agency. They will be in the same USDA Service Center. On-line at:
FSA Home
Click on "Conservation Programs" for more information.
Also, check with the folks at your nearest Ducks Unlimited. They do a lot of work with USDA and State agencies in developing suitable wildlife habitat.
Wetlands Conservation, Waterfowl Habitat Restoration, Research - Ducks Unlimited & Conservation
Cheers.
Jim