E2 pH (2) Akosombo, 1985-1988 Depth [m] Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Surface 6.9 7.1 7.1 6.9 7.1 6.9 6.9 6.9 7.1 7.1 7.7 6.9 Ampem, 1974-1975 Surface 7.5 7.7 8.1 7.7 7.8 7.4 7.2 7.3 7.5 7.7 7.9 7.3 1 7.5 7.6 8.1 7.7 7.8 7.4 7.2 7.3 7.3 7.7 7.9 7.2 5 7.4 7.3 8.1 7.6 7.8 7.3 7.2 7.3 7.2 7.7 7.7 7.2 10 7.3 7.3 7.4 7.45 7.7 7.2 7.15 7.1 7.1 7.4 7.4 7.2 Bottom 7.2 7.0 7.3 6.95 7.1 7.1 7.15 6.9 7.0 6.9 6.9 7.1