section and other Government Offices. Progress report and record photos for the whole Department were also made amounting to 1,697 negatives. 805 contact prints were made, and 204 miscellaneous reflex prints from 25 negatives.
159. Drawings were also prepared for the coloured maps. Six sets used for the Riot Reports, English and Chinese versions. New grids were also made for the printing of new sets of 8 inch to 1 mile scale plans of Hong Kong and Kowloon, and the basic plans brought up to date.
DRAINAGE OFFICE
Chief Engineer, E. P. Wilmot Morgan, B.Sc. (Civ. Eng.), A.M.I.C.E., A.M.I.W.E.
General
160. The rainfall during the year was abnormally low and resulted in no appreciable rainstorm or typhoon damage, and in this connexion it is worth noting that despite the short hours of water supply and the low flow in the sewers, the number of chokes cleared during the year showed a reduction of 1,500 as against the number quoted in the previous year. While this large reduction could partly be attributed to the comparatively large relaying programme undertaken, especially on the Island, it is even more noteworthy when it is considered that over 11 miles of sewers and stormwater drains were added to the drainage system of the Colony during the year. Of this figure of over 11 miles, approximately two-thirds was laid either as work contingent on development or within the development of housing estates, etc., thus showing that private development had lost none of its impetus.
161. The following table sets out the drainage work executed during the year with the exception of the major construction works on intercepting sewers, screening plants, pumphouses, etc.:
Island Kowloon & New Kowloon New Territories Total New drainage laid (length in feet) 13,773 34,041 10,103 58,917 Replacement of defective drainage (length in feet) 21,991 3,055 145 25,191 Connexions provided 310 820 131 1,261 Chokes cleared 3,315 4,100 17 7,44229