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TECHNICAL ANALYSIS OF WHY THE MARINA BARRAGE IS THE CAUSE OF RECENT FLOODS

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TECHNICAL ANALYSIS OF WHY THE MARINA BARRAGE IS THE CAUSE OF RECENT FLOODS

Post by Darkmen on Sun Sep 08, 2013 6:45 am

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While PUB issued flash flood warnings at 12.15pm on Sunday 5th June, we’ve to ponder if the 7 Barrage pumps are capable even to dispel the volume of water that fell on that particularly fateful day.

Three points to consider:

A. 65mm rain within 30 minutes over central areas of Singapore:

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“A total of 124mm of rain fell over central areas of Singapore – this is equivalent to 77 per cent of the amount of rainfall that usually falls in the month of June. This rainfall was more intense than June last year, with about 65mm recorded within 30 minutes Sunday morning, compared to the 100mm within 2 hours on June 16, 2010.”
65mm of rain that fell in a violent 30 minutes is equivalent to 65 liters per square meter.
B. High tide at 2.24pm on Sunday 5th June & barriers are assumed to be up at mid-point from 0716 hours or ~11am.

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C. Pump volume: 280 cubic meters per second, assuming ALL 7 massive water pumps are operational.

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We know the combined capacity of the pumps are 280 cubic meters per second or 280,000 liters per second or 16.8 million liters per minute. Within a 30-minute period, the pumps can handle 504 million liters (16.8 million liters per minute x 30 minutes).
Since the Barrage pumps can only handle 504 million liters within 30 minutes, we sure hope the “central areas of Singapore” is only as large as 7.75 square km (504 million liters / 65 liters per square meter).

If the “central areas of Singapore” that includes Bukit Timah Road, Dunearn Road, Orchard Road, Potong Pasir, Macpherson, Toa Payoh & Balestier which experienced a 30-minute violent rainfall eventually flowing into the Kallang Basin, is larger than 7.75 square km, then there’s the possibility the pumps are not up to the task.

In perspective, Sentosa is 5 square km.

Also, even if the June 16, 2010 rainfall of 100mm within 2 hours (& during a high tide) fell within a 20 square km catchment area, the barrage pumps would be straining to handle that volume (20 square km is only just ~3% of Singapore main island land mass).

We may just have a serious underestimation on our hands and all the recent excuses are red herrings leading us on a wild-goose chase instead of the real problem – our barrage is not fit for purpose.

.

Fed-up with cover-up
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Darkmen
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