A big drain passing through a residential complex on Mahadevapura Main Road 4th Cross in Shanthinagar is causing a lot of problems to residents living in the surroundings who are bearing the stench emanating from the sewage water. Also, mosquitoes have increased a lot in the locality with children and senior citizens falling sick due to mosquito bites. Authorities concerned are urged to cover the big drain with concrete, which would be helpful for all.