It sounds like you are looking for wetland restoration and mitigation resources. If you Google ‘wetland restoration’ you will get a ton of hits. As a starting point, you can try downloading these:
http://www.bay.org/publications/design-guidelines-for-tidal-wetlands-restoration-in-san-francisco-bay
http://www.wrmp.org/design/#downloads
http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/water/wetlands/restore/?cid=nrcs143_010912
Las Vegas might be an odd example for Ghana, but this is a big project where I helped design the cienega/wetland restoration:
http://www.springspreserve.org/attractions/trails.html
