How
do heavy sediment deposits affect waterways

The deposition of heavy sediment can significantly diminish the water quality and aquatic habitat.  The sentiment in the water can reduce the sunlight that reaches the floor of the waterway, affecting animal and plant life. For example, photosynthesis may be less effective due to the decreased sunlight and the gills of fish may get clogged from the sediment.

The peak above is part of the  sierra madre occidentals ,  a chain of volcanic mountains that runs through the middle of central america. 

Lol why dont you actually do the work instead of have people do it for you. jk i do it too lol