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Rehabilitation of polluted rivers has gained great importance to many countries in the world since the last century as the river is a vital water resource and it is being altered because of urbanization and industrialization causing great threat to the environment. Literatures on river rehabilitation projects have been reviewed focusing on the developing part of the world such as USA, UK, Japan etc. Rehabilitation issues of rivers crossing borders have also been discussed in this paper. Key lessons from different experiences in different regions have been extracted and comparison has been done. Statistics on different experiences has also been presented. Finally, some guidelines have been provided based on different experiences, which should be helpful for developed and developing nations making river rehabilitation efforts.

Riverbank erosion is a major concern in all parts of the world due to its extensive impacts geomorphologically and economically. This study aims to quantify the rates of riverbank erosion of Pusu River using erosion pins method. Two sections of the river were selected namely site A and site B where site A is a straight section while site B is situated on the outside bend. 21 pins were installed at each site in a grid pattern. Measurement of erosion pins exposure were taken from February 2019 to April 2019. Field observation were made to identify the possible factors influencing the bank erosion. The average rates of bank erosion ranged between 0.05 cm/day to 0.21 cm/day at site A and 0.09 cm/day to 0.51 cm/day at site B. Bank failure occurred at site B towards the end of measurement period due to high flow after heavy rainfall event. Field observations suggest that rates of riverbank erosion were influenced by several factors such as the flow velocity and vegetative cover of the bank.