River capture is the process where by a strong river diverts a parallel weak river and forms a strong stream through pirate stream. It is pirate stream that advances towards the weaker stream and capture it.
In order for river capture to develop the following conditions should be in operation:
- There must be strong river flowing adjacent to the weak river so that the powerful stream may capture its weak neighbor
- The powerful river must have a greater energy to undertake both vertical and head ward erosion
- The powerful river must be flowing at lower and steeper gradient than the weak river
- The capturing river must be flowing over rocks that are more easily eroded than the weak river