Location	Pool	Riffle	Difference
1	6	3	3
2	6	3	3
3	3	3	0
4	8	4	4
5	5	2	3
6	2	2	0
7	6	2	4
8	7	2	5
9	1	2	-1
10	3	2	1
11	4	3	1
12	5	1	4
13	4	3	1
14	6	2	4
15	4	3	1