Яркон
In 1930s the British authorities in Palestine searched for an additional major water resource for the evolving city of Jerusalem. Two options were examined at the time: the Jordan River the Yarkon River. The Jordan River is closer to Jerusalem but located at a much lower altitude than the Yarkon River and in order to bring the water up to the peaks of Jerusalem a relatively complex technology would be needed to be used, therefore the British authorities decided to opt for the alternative Yarkon-Jerusalem water extraction pipeline. Using water pumps placed in the springs which flowed into the Yarkon River, water was flowing up to Sha'ar HaGai and then through additional pumps into the city of Jerusalem. The Rosh HaAyin springs were, during the period of the British Mandate in Palestine, the main and most important water resource of Jerusalem. They provided 13,000 cubic meters of water every day to the city residents.