In 1894, the small action dam Surrpull (Red Bridge) was constructed on the main Urak road to control flooding, and divert water, coming catastrophically from snow melt and rain down the Zarghoon Ghar and Murddar Mountains Koh-i-Murdaar streams, into Hanna Lake through its main canal.
Over a century old in 1908, this lake was spread over an area of 818 acres with a holding capacity of over 220 million gallons of water and a depth of 49 feet (15 m).In 1973[5] a heavy flood destroyed the Murdar Mountains recharge linked canal on the way to Surrpull, near Spin Kaarrez road, which has not been (Restored) reconstructed till date.
Presently, in May 2016 a heavy flood filled this small action dam Surrpull with mud and stones. Accordingly, all the streams and flood waters are going waste and there is no chance to regulate water conservancy to Hanna Lake without the restoration, desilting of surrpull and both main canals. On the other hand, the water level in Hanna Lake is falling critically low, hence endangering the natural ecosystem, the local wild life, the environment of the surroundings, and native peoples, along with hundreds of migrated birds and thousands of fish. The future of athletic activities such as rowing and canoeing is also in danger. It is possible that the Hanna Lake might be fully dried, like in 1999 to January 2005, and in 2010.
The environmental scientists, Speleologists and the Conservationists are looking at the future of the lake in its most dangerous condition. The current harmful environmental situation will badly affect the natural eco system, environment, and underground water level of the surroundings. However, the small action dam surpull was locally restored / desilted in February 2019, with the assistance of Hashim Khan Ghalzai, secretary P&D, and Hayatullah Khan Durrani C.E, HDWSA. Since then the flood rain from the Zarghoon mountains has been continuously coming to Hanna Lake, and the water level has risen by up to 50%.