As the people have brought forward the story behind the great existence of the tank, from their ancestors, it was the Prince of Wales in 1875 who had proposed this tank and showed the feasibility of satisfying Colombo’s water requirement from Labugama. And thus, the construction of the tank commenced in 1882.
By 1886 the tank was able to commence the flow of water to Colombo and it holds a remarkable capacity of 1960 million gallons of water. It provides 16% of Colombo’s water requirement.
So, how does one find water for a tank; you find a reliable source such as the Kelani River, go along the course till it branches off to create the Wak Oya and place the tank at the tip of this brook. The Labugama province receives approximately 3000ml of water with the monsoon rains and with that you have the story behind water for the tank.