Which of the following was not a purpose for building Farakka Barrage?

The Farakka barrage was constructed by India in 1975 to divert water from the Ganges river system. It's main purpose was to checking water flowing in Bangladesh, checking silting of Kolkata port and erosion of Kolkata port. But recently Farakka Barrage was in news because of silting of river bed in Bihar which causes devastating flood in Bihar.