1956-1957 — Page 62

Public Works Department Annual Report 工務司署年報 All AI Reviewed

reservoirs would not fill and on July 19th the daily hours of supply were reduced to 5. Despite this reduction the reservoirs did not fill and for the first time on record not one of the 13 overflowed and not a single district was given a full supply.

281. Although the quantity of water held in storage at the beginning of the dry season was the smallest recorded at this time of the year since Jubilee Reservoir was completed, the supply was maintained at 5 hours per day throughout the winter. This was made possible partly owing to the prospect of obtaining water from Tai Lam Chung in the early spring and partly owing to the very successful operation of the two emergency pumping schemes which were inaugurated towards the end of the last financial year and described in last year's Report.

282. Of the two pumping schemes that at Shatin operated successfully and apart from normal routine overhauls, continuously throughout the year. The much larger Taipo scheme was stopped for about two months during the summer when there were prospects of Jubilee Reservoir filling from its normal catchment area. During this time the opportunity was taken to install safety relief valves at all the pumping stations and to replace the two small electric pumps, which had previously restricted the "flow" with the large electric pump from Tytam Tuk at the highest pumping station.

283. The installation of the relief valves solved the problem of protecting the main against the very large surge pressures which had previously been experienced every time a power failure occurred and which had resulted in numerous burst pipes. The installation of the larger pump increased the output of the scheme by approximately 50% to just under 4 million gallons per day.

284. During the year the two pumping schemes added 1,252 million gallons to the Colony's reserves and of this quantity no less than 853 million gallons were delivered when the water was most needed, during the six dry months October to March.

285. The usual problems attendant upon drastic curtailment of the hours of supply were again very much in evidence. A large programme of renewals and improvements including temporary alterations to the distribution system was carried out

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Areservoirs would not fill and on July 19th the daily hours of supply were reduced to 5. Despite this reduction the reservoirs did not fill and for the first time on record not one of the 13 overflowed and not a single district was given a full supply.281. Although the quantity of water held in storage at the beginning of the dry season was the smallest recorded at this time of the year since Jubilee Reservoir was completed, the supply was maintained at 5 hours per day throughout the winter. This was made possible partly owing to the prospect of obtaining water from Tai Lam Chung in the early spring and partly owing to the very successful operation of the two emergency pumping schemes which were inaugurated towards the end of the last financial year and described in last year's Report.282. Of the two pumping schemes that at Shatin operated successfully and apart from normal routine overhauls, continuously throughout the year. The much larger Taipo scheme was stopped for about two months during the summer when there were prospects of Jubilee Reservoir filling from its normal catchment area. During this time the opportunity was taken to install safety relief valves at all the pumping stations and to replace the two small electric pumps, which had previously restricted the "flow" with the large electric pump from Tytam Tuk at the highest pumping station.283. The installation of the relief valves solved the problem of protecting the main against the very large surge pressures which had previously been experienced every time a power failure occurred and which had resulted in numerous burst pipes. The installation of the larger pump increased the output of the scheme by approximately 50% to just under 4 million gallons per day.284. During the year the two pumping schemes added 1,252 million gallons to the Colony's reserves and of this quantity no less than 853 million gallons were delivered when the water was most needed, during the six dry months October to March.285. The usual problems attendant upon drastic curtailment of the hours of supply were again very much in evidence. A large programme of renewals and improvements including temporary alterations to the distribution system was carried out52

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Areservoirs would not fill and on July 19th the daily hours of supply were reduced to 5. Despite this reduction the reservoirs did not fill and for the first time on record not one of the 13 overflowed and not a single district was given a full supply.281. Although the quantity of water held in storage at the beginning of the dry season was the smallest recorded at this time of the year since Jubilee Reservoir was completed, the supply was maintained at 5 hours per day throughout the winter. This was made possible partly owing to the prospect of obtain- ing water from Tai Lam Chung in the early spring and partly owing to the very successful operation of the two emergency pumping schemes which were inaugurated towards the end of the last financial year and described in last year's Report.282. Of the two pumping schemes that at Shatin operated successfully and apart from normal routine overhauls, con- tinuously throughout the year. The much larger Taipo scheme was stopped for about two months during the summer when there were prospects of Jubilee Reservoir filling from its normal catchment area. During this time the opportunity was taken to install safety relief valves at all the pumping stations and to replace the two small electric pumps, which had previously restricted the "flow" with the large electric pump from Tytam Tuk at the highest pumping station.283. The installation of the relief valves solved the problem of protecting the main against the very large surge pressures which had previously been experienced every time a power failure occurred and which had resulted in numerous burst pipes. The installation of the larger pump increased the output of the scheme by approximately 50% to just under 4 million gallons per day.284. During the year the two pumping schemes added 1,252 million gallons to the Colony's reserves and of this quantity no less than 853 million gallons were delivered when the water was most needed, during the six dry months October to March.285. The usual problems attendant upon drastic curtailment of the hours of supply were again very much in evidence. A large programme of renewals and improvements including temporary alterations to the distribution system was carried out52

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281. Although the quantity of water held in storage at the beginning of the dry season was the smallest recorded at this time of the year since Jubilee Reservoir was completed, the supply was maintained at 5 hours per day throughout the winter. This was made possible partly owing to the prospect of obtain- ing water from Tai Lam Chung in the early spring and partly owing to the very successful operation of the two emergency pumping schemes which were inaugurated towards the end of the last financial year and described in last year's Report.

282. Of the two pumping schemes that at Shatin operated successfully and apart from normal routine overhauls, con- tinuously throughout the year. The much larger Taipo scheme was stopped for about two months during the summer when there were prospects of Jubilee Reservoir filling from its normal catchment area. During this time the opportunity was taken to install safety relief valves at all the pumping stations and to replace the two small electric pumps, which had previously restricted the "flow" with the large electric pump from Tytam Tuk at the highest pumping station.

1956-1957 — Page 62

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