 The reservoirs and have a combined capacity of 3,338 million gallons (15.175 million m3) and were completed in 1902.The valve towers for each reservoir are located at the west end of the dividing embankment.Soon after completion of the reservoirs in 1902 the three water companies, and seven others, became part of the Metropolitan Water Board which was established under the provisions of the "Metropolis Water Act 1902" (2 Edw.