Table 2.
Physicochemical parameters of the various water type categories
| Water types |
Temp (°C) | pH | DO (mg/l) | TSS (mg/l) | BOD5 (mg/l) | Chloride (mg/l) | Salinity (mg/l) | Hardness (mg/l CaCO3) |
Electrical conductivity (μS/cm) |
Nitrate plus nitrite (mg/l) |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M | R | M | R | M | R | M | R | M | R | M | R | M | R | M | R | M | R | M | R | |
| BL | 28.3 | 25.7–33.6 | 6.2 | 5.8–7.5 | 2.9 | 1.1–8.4 | 2 | 0.1–34 | 5.6 | 0.1–17 | 486 | 290–850 | 1.1 | 0.5–30 | 392 | 213–1,800 | 2,400 | 1,100–5,900 | 19 | 1.2–92 |
| BH | 29.6 | 27.8–32.7 | 6.8 | 6.5–7.1 | 2.1 | 1.3–7.3 | 1.8 | 0.2–42 | 6.1 | 1.0–18 | 348 | 220–590 | 1.0 | 0.4–1.3 | 336 | 170–660 | 2,100 | 790–2,800 | 39 | 9.2–75 |
| OP | 28.3 | 25.8–29.3 | 6.4 | 6.1–6.9 | 2.5 | 0.5–8.1 | 16 | 3.6–720 | 35.9 | 23–48 | 249 | 8.7–390 | 0.7 | 0.1–1.3 | 119 | 9.6–310 | 1,500 | 150–2,700 | 22 | 2.8–100 |
| US | 27.8 | 25.0–33.6 | 7.7 | 7.1–8.3 | 4.7 | 1.7–8.9 | 102 | 6.8–4,800 | 86.9 | 33–200 | 37 | 17.8–320 | 0.2 | 0.1–0.8 | 122 | 39–220 | 450 | 210–1,700 | 7 | 0.2–16 |
| DS | 27.4 | 24.9–29.0 | 7.6 | 7.3–7.9 | 1.1 | 0.8–8.6 | 161 | 14.2–3,600 | 109.6 | 78–180 | 126 | 21.9–360 | 0.4 | 0.1–1.1 | 113 | 30–270 | 810 | 220–2,200 | 12 | 4.8–31 |
Abbreviations: M, Median; R, Range; BL, Pooled low-risk boreholes; BH, Pooled medium-risk boreholes; OP, Pooled high-risk boreholes; US, Pooled upstream sites and DS, Pooled downstream sites; Temp, Water temperature; DO, Dissolved oxygen; TSS, Total suspended solids; BOD5, Five days’ biological oxygen demand; n = 5 habitats × 15–18 single samples.