 A major benefit for British Waterways was the increased value of the land which it holds in areas no longer subject to flooding, which it was expected would exceed the cost of the project.The lock is 62 metres long, 8 metres wide and 2.4 metres deep, and can hold two 350 tonne barges (other locks on the Lower Lee limited barges to about 120 tonnes).It was designed by Tony Gee and Partners and built by Volker Stevin.