The Dagwan Nallah is a stream that flows through the Dachigam National Park. At the edge of the Park this little piece of engineering diverts some of the water from the Dagwan Nallah / River into the Sarband Lake, that traditionally was used to supply drinking water to Srinagar city. This system was set up way back in 1906. And for many years the water was just supplied raw so pristine was the water.