(a) the capacity of the water surrounding the Colony to accept sewage either raw or treated;
(b) by means of a pilot plan now being designed, the best methods under varying conditions to achieve the required quality of effluent.
As and when the need arises to construct a project recommended in the Report, the basic data is checked and brought up to date as necessary.
3.15. The annual rainfall measured at the Royal Observatory varies between 35.48 inches (1963) and 119.71 inches (1889) with a mean value of 85.39 inches. In recent years, the highest intensity recorded in the Colony has been 6.18 inches in one hour (Aberdeen 12th June, 1966), after rainfall had been recorded on every day during that month. The main urban areas are relatively flat lying below hills which rise to between 1,000 to 1,500 feet. The Royal Observatory has prepared intensity/duration curves for varying probabilities of recurrence. Following a visit of E.C.A.F.E. advisers, an empirical formula is used for the determination of the time required to attain maximum flow at the section of the stormwater drainage system to be designed. This 'time of concentration' determines the intensity of rainfall to be used in the design, and this is considered to be sufficiently accurate for the smaller catchments typical in the Colony.
3.16. Seawalls, piers, and other marine structures are designed and constructed as and when required, rather than to a comprehensive overall plan. The hilly topography of most of the Colony frequently makes large-scale site formation, sometimes combined with reclamation, necessary before urban development can take place. Detailed planning layouts are prepared in consultation with the Crown Lands and Survey Office and the District Commissioner, New Territories. Large-scale development for new towns is carried out in stages.
LAND
3.17. In carrying out the responsibilities of survey, mapping, town planning, and the development and control of land, three factors are kept firmly to the fore:
(a) the need for continuous preparation and updating of survey maps and planning layouts which are basic to all forms of land development;
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(a) the capacity of the water surrounding the Colony to accept
sewage either raw or treated;
(b) by means of a pilot plan now being designed, the best methods under varying conditions to achieve the required quality of effluent.
As and when the need arises to construct a project recommended in the Report the basic data is checked and brought up to date as
necessary.
3.15. The annual rainfall measured at the Royal Observatory varies between 35.48 inches (1963) and 119.71 inches (1889) with a mean value of 85.39 inches. In recent years the highest intensity recorded in the Colony has been 6.18 inches in one hour (Aberdeen 12th June, 1966), after rainfall had been recorded on every day during that month. The main urban areas are relatively flat lying below hills which rise to between 1,000 to 1,500 feet. The Royal Observatory has prepared intensity/duration curves for varying probabilities of recurrence. Following a visit of E.C.A.F.E. advisers, an empirical formula is used for the determination of the time required to attain maximum flow at the section of the stormwater drainage system to be designed. This 'time of concentration' determines the intensity of rainfall to be used in the design and this is considered to be sufficiently accurate for the smaller catchments typical in the Colony.
3.16. Seawalls, piers and other marine structures are designed and constructed as and when required, rather than to a comprehensive over- all plan. The hilly topography of most of the Colony frequently makes large scale site formation, sometimes combined with reclamation, necessary before urban development can take place. Detailed planning layouts are prepared in consultation with the Crown Lands and Survey Office and the District Commissioner, New Territories. Large scale development for new towns is carried out in stages.
LAND
3.17. In carrying out the responsibilities of survey, mapping, town planning and the development and control of land, three factors are kept firmly to the fore:
(a) the need for continuous preparation and updating of survey maps and planning layouts which are basic to all forms of land development;
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