3.33. Planning of the supply facilities necessary to deliver water to the consumers is carried out by the Waterworks Planning Division. In newly developing areas, this involves assessment of the best physical subdivision of the area 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 the added guidance of a record of demand growth. All of this planning is duplicated for salt water flushing supplies.
3.34. Reservoir operational planning has historically depended on frequent adjustments of the supply zones of the various reservoirs so that the rate of draw-off is changed. The object is to avoid overflow from some reservoirs whilst others are not yet full, or conversely, to avoid some reservoirs emptying before others. The 'normal' complications of this work are the physical limitations on rate of draw-off from any particular source, the estimation of demand in the supply zone selected, and the rapid changes which can take place in the relative storage positions of the reservoirs due to mal-distribution of rainfall. At present, a further major limitation is the need to maintain fresh water and saline water zones to insulate certain industries from the effect of salinity in water drawn from the Plover Cove Reservoir.
The Time Scale
3.35. The horizon for different planning purposes varies. Thus, from conception to completion, a large reservoir may need 8-10 years, a treatment plant 5-6 years, service reservoirs and pumping stations 3-4 years and trunk mains 1-2 years. The arrangements for draw-off from reservoirs to maintain a proper distribution of resources must be planned months ahead, but sudden storms may require alterations to be made overnight.
3.36. All of this planning requires experienced professional staff trained in many inter-related disciplines, and maintaining such an organization might be said to be the most important planning function of the management of the Waterworks.
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3.33. Planning of the supply facilities necessary to deliver water to the consumers is carried out by the Waterworks Planning Division. In newly developing areas, this involves assessment of the best physical subdivision of the area 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 the added guidance of a record of demand growth. All of this planning is duplicated for salt water flushing supplies.
3.34. Reservoir operational planning has historically depended on frequent adjustments of the supply zones of the various reservoirs so that the rate of draw-off is changed. The object is to avoid overflow from some reservoirs whilst others are not yet full, or conversely, to avoid some reservoirs emptying before others. The 'normal' complications of this work are the physical limitations on rate of draw-off from any particular source, the estimation of demand in the supply zone selected, and the rapid changes which can take place in the relative storage positions of the reservoirs due to mal- distribution of rainfall. At present, a further major limitation is the need to maintain fresh water and saline water zones to insulate certain industries from the effect of salinity in water drawn from the Plover Cove Reservoir.
The Time Scale
3.35. The horizon for different planning purposes varies. Thus, from conception to completion, a large reservoir may need 8-10 years, a treatment plant 5-6 years, service reservoirs and pumping stations 3-4 years and trunk mains 1-2 years. The arrangements for draw-off from reservoirs to maintain a proper distribution of resources must be planned months ahead, but sudden storms may require alterations to be made overnight.
3.36. All of this planning requires experienced professional staff trained in many inter-related disciplines, and maintaining such an organization might be said to be the most important planning function of the management of the Waterworks.
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