Month

Mean TSS concentration (ppm) 1978-1989 (±SD)

Mean TSS concentration (ppm) 1990-2001 (±SD)

1

2.00 (0.82)

2.71 (0.75)

2

3.49 (1.11)

3.55 (1.05)

3

5.49 (1.99)

3.93 (1.52)

4

5.27 (1.31)

6.07 (3.31)

5

5.60 (2.76)

5.35 (1.78)

6

3.25 (0.86)

3.62 (1.06)

7

2.85 (0.83)

3.08 (0.86)

8

3.29 (0.59)

2.82 (0.68)

9

2.67 (0.72)

2.71 (0.70)

10

2.43 (0.62)

2.75 (0.63)

11

1.89 (0.75)

2.28 (0.65)

12

2.04 (1.02)

2.22 (0.49)