To determine the elevation, we used two poles connected by a string. We put the poles on level ground and ensured that the string was also level. We anchored the string on one pole, and moved the second pole to another location. When the string was flat again, if the two sides were at different locations along the poles, we knew there was an elevation change. By subtracting one number from the other, we determined the change in elevation.
We also looked at the number of clams in certain locations along the river bank.
We found the most clams in the river, close to the shore, and less along dry riverbeds and islands. We shoveled dirt into a sift and picked out the clams.
To determine flow rate, we let a ball float along the river and calculated how long it took the ball to get from one place to the other.
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