Some large engineering works have also been carried out during these years. The Waitakere dam, which stores 220,000,000 gallons of water, was finished in 1906. Two other reservoirs are under construction at Nihotupu, the upper designed to contain 69,000,000 gallons of water, and the main dam 540,000,000 gallons. The smaller dam is expected to be completed shortly, and the large one in 1923. A comprehensive scheme of drainage and sewerage for the city and suburbs was started on 25th October, 1909, and the main outfall works were opened on March 25th, 1914. The work of linking up other districts has proceeded during the following years. Electrical supply for power and lighting was taken in hand by the Corporation in 1906, and the first supply was given from Freeman's Bay in 1908. Since that date the department has grown considerably, although the war interfered with the supply of material and delayed the development of the scheme. An idea of the present extent of the undertaking may be formed from the fact that for the year ending 31st March, 1921, 10,496,060 units were sold, the revenue being £108,734. The electric tramway system was inaugurated on 24th November, 1902, powers having been given to a company for this purpose. The City Council took over the concern on July 1st, 1919. There are at present twenty-seven miles of lines and 154 cars in commission. For the year ending 31st March, 1921, the cars carried 45,820,939 persons. Other activities which engaged the attention of the Council were the erection of new abattoirs at Westfield (opened in 1909), and large new city markets, which were completed in 1917 and 1918. The Corporation also entered the fish trade, opening markets and providing trawlers to catch fish, and, besides supplying the trade, it retails this food at its own shop. The figures of last year's working indicate the extent of this business. The total weight of fish received from all sources was 1040 tons, the sales amounting to £49,758. The provision of houses by the municipality was commenced in 1915, when six houses were erected in Ponsonby. A larger scheme of dwellings, to be erected on the old abattoir site at Grey Lynn, was proposed in 1918, but, owing to financial difficulties, it could not be carried out. As an instalment of the proposal, ten cottages have been built on this site up to the present. [Illustration: The Town Hall, with the Sir George Grey Statue]