A river is defined as a body of running water carrying sediments which flows along a definite path.The study of the channel pattern and the channel geometry at several points along a river channel, including the network of tributaries within the drainage basin is known as River Channel morphology.

River Channel Pattern

When the river flows in its way, it follows a definite path, the path followed by the river during its flow is called river channel. The river follows different path according to the energy level, the velocity of river and the gradient of riverbed. There are three different types of river channel pattern:
1.    Straight River
The river follows a straight path in its high energy level. In this case erosion is predominant and the velocity of river is maximum. Mostly, high erosion with less deposition occurs. In hilly region, the river follows straight path.
This type of channel pattern are very advantageous in terms of hydro-power generation and easy to construct bridges. But unavailability of construction material easily is one of the hindrance at such place.
Bhotekhosi, Arun, Marshyangdi are some of the straight rivers found in Nepal.

2.Mendering River
In this type of flow, the river follows the path like as snake's movement or zig-zag way. In valley region, the river follows the meandering path. Erosion and deposition take place side by side in the same time.
This type of river channel pattern is advantageous in terms of hydro-power generation, possibilities of building reservoirs and easily available construction materials. But difficulties in constructing bridge over the river due to its possibilities to divert path from the original position is one of the main disadvantages.
Kali-Gandaki, Karnali are some of the meandering rivers found in Nepal.

3.Braided River
In this type of flow, the river follows multiple channels. Deposition is predominant in this flow. The braided river tends to be very wide and relatively shallow. The river follows this type of path in Terai region.
Easy availability of construction materials is advantage, whereas unsecure construction of bridge and flooding are disadvantages at such places.