We are trying to see the effect of sedimentation on wildlife in Tanzania and we can't seem to find any effective but yet inexpensive way of measuring sedimentation. any advice would be much appreciated.
You could also try placing something square with rims around the side on the bottom. Knowing the surface area of the square and volume of sediment obtained you can figure out the rate.
We have done some experiments to understand the sedimentation process in our seaweed cultivation farm. We have used small glass bottles with round bottom and placed them for 24 hr in the field. The samples were collected and data was expressed over area of the bottle. The only precaution which you need to take is the bottles remained in the same plain as the topography of the sea bed.