plans following publication of a list by the Town Planning Section, over 600 being supplied. Revision of existing tracings (200′ scale) was carried out, many changes in spelling of names being necessary. Two drawings in full colour were made of the Royal Coat of Arms for the P.W.D. Architectural Office. Work was also carried out for the Urban Services Department in locating and preparing plans of all old cemeteries on the Island and the Mainland.
DRAINAGE OFFICE
Chief Engineer, E. P. W. Morgan, B.Sc., A.M.I.C.E., A.M.I.W.E.
GENERAL
188. The rainfall during the year was about 40% above average, chiefly because of very severe rainstorms in the last week of May and the third week of June, which caused widespread damage by flooding on both sides of the harbour. Certain nullahs filled with silt and overflowed their walls; in particular, Wun Sha Street Nullah, Kai Tak Nullah and Waterloo Road Nullah. About 50,000 tons of silt were removed from Kai Tak Nullah alone whilst the total amount removed from all nullahs after these storms was in the region of 145,000 tons.
189. The Army assisted greatly in the removal of silt from Kai Tak Nullah by the use of mechanical plant.
190. The number of choked sewers cleared during the year showed an increase of 1,300 over the previous year's total due probably to the effect of the heavy rainstorms. The length of new sewers and storm-water drains added during the year was 14.2 miles being an increase of four miles over the previous year's total, whilst 3.7 miles of defective drainage were replaced.
191. The following table lists the normal drainage work carried out during the year, but does not include intercepting sewers and plant for Main Drainage Schemes:
Island Kowloon & New Kowloon New Territories Total New Drainage Laid (length in feet) 16,624 35,972 22,000 74,596 Replacement of Defective Drainage (length in feet) 5,426 13,997 40 19,463 Connexions provided 609 1,281 43 1,933 Chokes cleared 3,344 5,207 187 8,735192. It will be seen that most of the replacement of defective drainage was in Kowloon, a large proportion of this figure being in the Yau Ma Tei Drainage area to connect up with the new intercepting sewers which had been completed in the previous year. New drainage