Rivers
There are 10 (ten) major rivers in the state. They are generally
ephemeral in nature and their flow is directly related to the rainfall,
being in spate in rainy season and running almost dry during summer
months.
The purity and sustained and regular discharge of water is directly
proportional to intensity of vegetative cover in the river systems. Due
to deforestation in the catchment areas of such river systems all the
navigable rivers have become almost dry during lean seasons. The water
are muddy during rainy season and bitterly polluted during lean periods.
The burima,gomati, khowai,howrah, longai, dhalai, muhuri, feni, juri,
manu are the major rivers .
Besides, there are many small lakes and ponds in the state. There are as
many as 13 lakes inside trishna wildlife sanctuary, and 2 inside
sepahijala wildlife sanctuary. Many migratory birds visit these lakes.
Special mention may be made of a clear water lake " devtapukur" at the
source of muhuri river which can be a beautiful tourist spot in future.
Major rivers in the state:
| Name of river | Basin area in sq. km. | % of basin area to geographical area of the State | Annual flow in 1000 cubic meter | % of flow to total flow |
| Burima | 658 | 6.27 | 13428 | 1.69 |
| Dhalai | 695 | 6.61 | 42778 | 5.40 |
| Fenni | 555 | 5.28 | 50433 | 6.36 |
| Gumti | 2378 | 22.66 | 249399 | 31.45 |
| Haora(Saidra) | 570 | 5.43 | 36032 | 4.54 |
| Juri | 586 | 5.57 | 15709 | 1.98 |
| Khowai | 1378 | 13.13 | 115854 | 14.61 |
| Longai | 342 | 3.25 | 9166 | 1.66 |
| Manu-Deo | 1979 | 18.86 | 170034 | 21.44 |
| Muhuri | 839 | 8.00 | 76247 | 9.63 |
| Other streams | 511 | 4.90 | 13797 | 1.74 |
| Total | 10491 | 100 | 792877 | 100 |
Source: Department of science, technology and environment
River Water Quality (Year - 2019)
| Min | Max | |
| Temperature (degree celcius) | 20 | 28.5 |
| Dissolved Oxygen (mg/l) | 5.5 | 8.1 |
| pH | 6.1 | 7.8 |
| Conductivity (umho/cm) | 102 | 233 |
| Bio Chemical Oxygen Demand (mg/l) | BDL | 3.8 |
| Nitrate (mg/l) | BDL | 2.57 |
| Faecal Coliform (MPN/100ml) | 11 | 350 |
| Total Coliform (MPN/100ml) | 110 | 920 |
