SN pH EC (µScm-1 ) TDS (ppm) TSS (ppm) NO3-N (µgL-1) NH4-N (µgL-1) PO4-P (µgL-1) DIN    (µgL-1) DIP (µgL-1) DIN/DIP
Upstream Catchment                
1 7.7 414 208 547 500 180 848 680 848 0.8
2 7.9 312 156 820 400 240 783 640 783 0.82
3 7.8 389 194 373 400 160 1012 560 1012 0.55
Average 7.8 371.7 186.0 580.0 433.3 193.3 881.0 626.7 881.0 0.7
Std Dev. 0.1 43.4 22.0 184.0 47.1 34.0 96.4 49.9 96.4 0.1
Middle Stream Catchment              
4 8.7 572 287 200 600 150 979 750 979 0.77
5 8.5 510 252 387 940 700 979 1640 979 1.68
6 8.1 432 216 193 700 210 1012 910 1012 0.9
7 8.0 330 163 287 1000 890 1175 1890 1175 1.61
8 7.9 318 159 253 1250 1010 914 2260 914 2.47
Average 8.2 432.4 215.4 264.0 898.0 592.0 1011.8 1490.0 1011.8 1.5
Std Dev. 0.3 110.8 55.7 78.9 256.9 392.6 97.9 644.1 97.9 0.7
Downstream Catchment                
9 7.7 215 109 2700 400 130 1175 530 1175 0.45
10 7.9 196.4 97.6 1967 680 170 457 850 457 1.86
11 8.0 309 155 1740 900 170 1175 1070 1175 0.91
12 7.8 152.8 77.6 67 400 210 783 610 783 0.78
13 8.7 98.5 49.2 13 800 120 587 920 587 1.57
Average 8.0 194.3 97.7 1297.4 636.0 160.0 835.4 796.0 835.4 1.1
Std Dev. 0.4 78.2 39.3 1201.6 229.1 36.1 331.0 222.9 331.0 0.6
Table 2: Physico-chemical parameters along from Simiyu-Duma River.