3.39
The variability in the rainfall into and the volume of storage and size of catchment areas of the sixteen reservoirs, which at present provide Hong Kong's fresh water supply, impose a need to plan the various draw-offs so that the productivity of the collective sources is maximised.
3.40
Planning for the development of the salt water flushing systems is similarly required. During the year, these systems supplied 39 million gallons daily for sanitary purposes.
The Machinery
3.41
In the early post-war years, staff was scarce, and the priorities were more obvious.
There was no specific planning section in the Waterworks Office, and much of the thought on where new works were needed was done personally by the head of the office. As the organisation grew, and planning became more complex, a single planning officer was appointed in 1965 and planning is now undertaken by a staff of four or five engineers responsible to a Chief Engineer. Outline proposals are prepared for new water supply schemes for proposed development throughout the territory and also for revision of requirements in existing developments.
3.42
The planning for and development of operational programmes for existing resources is carried out by the Supply Division, and includes the management of storage and supply by computerization.
The Method
3.43
the need
—
The planning of resource development must begin with an estimate of
in this case, the future demand for water. Crudely, this can be done by extrapolation of the past trend. This method however ignores possible changes in the community which may make the future increase in demand quite different from that in the past. A more sophisticated complementary analysis can be made by subdivision of demand into categories e.g. industrial, and various domestic categories and with all available knowledge of future growth rates of each category of consumer, gleaned from population estimates, building programmes, etc., a picture of future demand can be built up from the estimates of its various parts. Estimates of this sort were prepared by the Water Resources Survey, and statistics to revise these are being gathered continuously by the Waterworks Supply Division.
3.44
—
When demand is estimated, the possible resources can be matched to it, taking account of practical time-tables for investigation, design and construction of large civil engineering works. This work showed the need to proceed with works to increase the capacity of the Plover Cove system, to construct the new reservoir at High Island, and to commence work on the building of a 40 million gallons a day desalting plant based on the multi-stage flash distillation principle.
3.45
Planning of the supply facilities necessary to deliver water to the consumers involves assessment of the best physical sub-division into supply zones, limited in extent and level, calculation of probable demand in these zones, based on estimates of use, population, and unit demand rates and selection of suitable sites for pumping stations, pipelines and service reservoirs.
The process is the same in established but growing areas, with
25
3.39
The variability in the rainfall into and the volume of storage and size of catchment areas of the sixteen reservoirs, which at present provide Hong Kong's fresh water supply, impose a need to plan the various draw-offs so that the productivity of the collective sources is maximised.
3.40
Planning for the development of the salt water flushing systems is similarly required. During the year, these systems supplied 39 million gallons daily for sanitary purposes.
The Machinery
3.41
In the early post-war years, staff was scarce, and the priorities were more obvious.
There was no specific planning section in the Waterworks Office, and much of the thought on where new works were needed was done personally by the head of the office. As the organisation grew, and planning became more complex, a single planning officer was appointed in 1965 and planning is now undertaken by a staff of four or five engineers responsible to a Chief Engineer. Outline proposals are prepared for new water supply schemes for proposed development throughout the territory and also for revision of requirements in existing developments.
3.42
The planning for and development of operational programmes for existing resources is carried out by the Supply Division, and includes the management of storage and supply by computerization.
The Method
3.43
the need
-
The planning of resource development must begin with an estimate of
in this case, the future demand for water. Crudely, this can be done by extrapolation of the past trend. This method however ignores possible changes in the community which may make the future increase in demand quite different from that in the past. A more sophisticated complementary analysis can be made by subdivision of demand into categories e.g. industrial, and various domestic categories and with all available knowledge of future growth rates of each category of consumer, gleaned from population estimates, building programmes, etc., a picture of future demand can be built up from the estimates of its various parts. Estimates of this sort were prepared by the Water Resources Survey, and statistics to revise these are being gathered continuously by the Waterworks Supply Division.
3.44
—
When demand is estimated, the possible resources can be matched to it, taking account of practical time-tables for investigation, design and construction of large civil engineering works. This work showed the need to proceed with works to increase the capacity of the Plover Cove system, to construct the new reservoir at High Island, and to commence work on the building of a 40 million gallons a day desalting plant based on the multi- stage flash distillation principle.
3.45
Planning of the supply facilities necessary to deliver water to the consumers involves assessment of the best physical sub-division into supply zones, limited in extent and level, calculation of probable demand in these zones, based on estimates of use, population, and unit demand rates and selection of suitable sites for pumping stations, pipelines and service reservoirs.
The process is the same in established but growing areas, with
25
No comments yet.
Private notes are available after approval.