The Kamala originates from Churia Range near Maithan which is near Sindhuliagarhi in Sindhuli District of Nepal at an elevation of . It flows in a southerly direction crossing Kamala Khoj area and after passing through a gorge above Chauphat it flows into the terai area of Nepal at Chisapani. The Kamala forms the border between Siraha and Dhanusa districts in the terai. During the monsoon the river swells up and thus causes devastating river bank erosion. Tao River and Baijnath Khola River merges with Kamala at Maini It enters Indian territory in Madhubani district in Bihar, upstream of Jainagar. A barrage known as Kamala barrage has been constructed by the State Government near Jainagar. It joins the river Kareh at Badlaghat in Khagaria district and the combined stream flows into the Koshi nearby. While one of its branches leads to the Bagmati another leads to the Kosi. In the lower reaches it follows the course of the Balan and is therefore also known as Kamala-Balan.
Tributaries
The main tributaries of the Kamala River are the Tao, Baijnath Khola, Mainawati, Dhauri, Soni, Balan, Trisula, and Chadaha.
River and basin data
The total length of the Kamala is of which is in Nepal and the remaining is in India. The river drains a total catchment area of out of which lies in Bihar in India and the rest in Nepal. Average annual rainfall is. Cropped area in Bihar is. Population of the Kamala basin in Bihar is 3.9 million.
Floods
The extent of flood impact can be gauged from the fact that about one million people were affected by floods in the Kamala and other rivers in the region in 2003. While 16.5 per cent of the total flood affected area in India is in Bihar, 57 per cent of India's flood affected population live in Bihar, out of which 76 per cent are in northern Bihar. About out of total area of or about 73.06 percent of the total area of Bihar is flood affected. Over 70 per cent of the population of North Bihar lives under recurring threat of floods.
The plains of Bihar, adjoining Nepal, are drained by a number of rivers that have their catchments in the steep and geologically nascent Himalayas. The Kosi, the Gandak, the Burhi Gandak, the Bagmati, the Kamala Balan and the Adhwara group of rivers originate in Nepal, carry high discharge and very high sediment load and drop it down in the plains of Bihar. Bihar witnessed high magnitudes of flood in 1978, 1987, 1998, 2004 and 2007. The flood of 2004 demonstrated the severity of flood problem when a vast area of was badly affected by the floods of Bagmati, Kamala and the Adhwara groups of rivers causing loss of about 800 human lives. Three dams have been proposed as solutions to north Bihar's flood problems. Among the three one is across the Kamala at Chisapani, but a report claims that there is no flood cushion in the proposed Chisapani reservoir. .External link:
Kamala Multipurpose Project
The Kamala Multipurpose Project would involve the construction of storage dam on the Kamala River in the districts of Dhanusa and Siraha in Nepal. The project would provide year-round irrigation facilities and generate hydropower with an installed capacity of 30 MW. This scheme forms part of the Sunkosi Storage-cum-Diversion Scheme which involves diverting water from the Sunkosi River to the Kamala River to augment lean season flow. However, there is a cause for worry. North Bihar is an earthquake prone area. In 1998, earthquake zone was Darbhanga that is only from the borders of Nepal where big dams are being proposed. In 1988, Kamala River embankment in Madhubani district breached due to earthquake cracks.
