THURSDAY, JUNE 25, 1992
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GRADING OF BEACH WATER QUALITY
THE ENVIRONMENTAL PROTECTION DEPARTMENT (EPD) TODAY (THURSDAY) ANNOUNCED GRADES ON THE BACTERIOLOGICAL WATER QUALITY OF ALL BATHING BEACHES IN HONG KONG.
THE PURPOSE OF THE GRADING SYSTEM IS TO INFORM SWIMMERS AND THE GENERAL PUBLIC ABOUT THE STATE OF BACTERIOLOGICAL POLLUTION AT VARIOUS BEACHES.
ANNOUNCED AT
AN EPD SPOKESMAN SAID THE GRADING WOULD BE BIWEEKLY INTERVALS DURING THE BATHING SEASON, TO COINCIDE WITH THE FREQUENCY AT WHICH BEACH WATERS ARE USUALLY SAMPLED.
THE GRADING IS BASED ON THE MOST RECENT B.COLI DATA OBTAINED BY THE EPD IN ITS ROUTINE MONITORING PROGRAMME.
AS WITH LAST YEAR, THE GRADING ALSO INCLUDES AN ESTIMATE OF THE RISK OF SUFFERING SOME MINOR SKIN OR GASTROINTESTINAL COMPLAINTS AS A RESULT OF SWIMMING AT A BEACH THAT HAS SOME DEGREE OF POLLUTION.
THE ESTIMATE IS BASED ON A VERY LARGE BODY OF STATISTICAL INFORMATION GATHERED IN HONG KONG IN RECENT BATHING SEASONS.
THE GRADING OF SOME BEACHES MAY VARY DURING THE SUMMER.
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THIS REPRESENTS A NATURAL FLUCTUATION IN THE BACTERIOLOGICAL QUALITY OF BATHING WATERS IN MOST CASES, AS RAIN AND TIDES BRING OR LESS POLLUTION TO THE BEACHES.
HOWEVER, THE GRADES GIVE A GOOD GENERAL PICTURE OF THE WATER QUALITY AT BATHING BEACHES AT THE TIME OF REPORTING AND FORM THE BEST AVAILABLE FORECAST FOR THE IMMEDIATE FUTURE.
"BEACHES WITH HIGHLY DEVELOPED HINTERLANDS ARE LIKELY TO BE MORE POLLUTED THAN THE GRADES SUGGEST DURING AND AFTER HEAVY RAIN.
"BATHERS SHOULD AVOID SUCH BEACHES FOR TWO OR THREE DAYS AFTER A STORM, LONGER IF THE WEATHER REMAINS OVERCAST OR LESS IF THERE IS STRONG SUNSHINE.
"
THE SYSTEM FOR GRADING BEACH WATER QUALITY IS AS FOLLOWS :
E.
* GRADE "1" INDICATES THAT THE WATER QUALITY IS GOOD. THE
COLI COUNT IS NO MORE THAN 24 PER 100 MILLILITERS AT EACH BEACH SO GRADED, AND THE EXPECTED RISK OF MINOR ILLNESS SWIMMERS IS UNDETECTABLE.
GRADE "2" INDICATES THAT THE WATER QUALITY IS FAIR. THE COLI COUNT IS NO MORE THAN 180 PER 100 MILLILITERS AT BEACH
GRADED, AND THE EXPECTED HEALTH RISK IS THAN 10 CASES OF MINOR ILLNESS PER 1,000 SWIMMERS.
ΤΟ
E.
EACH
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* GRADE "3" INDICATES THAT THE WATER QUALITY IS POOR.
COLI COUNT IS NO MORE THAN 610 PER 100 MILLILITERS AT BEACH 80 GRADED, AND THE EXPECTED HEALTH RISK IS
NO THAN 15 CASES OF MINOR ILLNESS PER 1,000 SWIMMERS.
THE
E.
EACH
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'* GRADE "4"