Here's a research essay on the effects of dams and dam removals. This is a highly contentious topic in the USA at the present time, and one that will be sure to haunt other developed nations as public awareness of environmental issues increases, and as dams age and become less viable. An academic review of the essay is available here.
I also did a project that modelled sedimentation rates occuring in brown trout spawning reaches in the Styx River (Christchurch, New Zealand). The text of this report is available online but none of the figures or tables have yet been converted for display here. Once I get hold of a scanner I will fix this lack.