Thursday, October 27, 2011

20111027 Shenton Way Flood - Its Deeper Implications

20111027 Shenton Way Flood - Its Deeper Implications
Two Points and Three Wisdom from Founders' Drainage Design Codes




Point One


Photographer reported at the Asia Sq , one side of the rd the water was flooding fast but the opposite side across the road the water subsided very fast also


This shows that one of the drains is totally choked.
Our floods subside very fast, even before rain stop.
One logical explanation is the high water pressure, caused by flood, push away obsticles in the drains, silts, leaves, rubbish.



Our water way therefore has enough capacity.
Our water way is too complex, costly to monitor, cleanse.









Point 2


Massive floods comes only after ABC Projects swing into place.

A $2 Billion dollars over the last decades did not include recent investment in  massive ABC projects, Bishan, Dawson, etc.http://bettersingapore.blogspot.com/2011/10/20101018-pub-2-billion-waterway.html


The claim, also in that report say that Orchard Road is too far away from Marina Barrage, therefore cannot be saved by Marina Barrage is flawed.

Shenton way is just stone throw away from the Marina bay.




These massive investment do not increase flow.


This veteran of  flood management standing in front of a river which the flow is stagnated.
This is no longer a river, this is a storage formed by barrages.
Therefore, the next project of widening, deepening of Singapore River, section Zion/Kim Seng will not solve upstream floods.


Federal Highway Administration has the following graph dictating what is the key of drainage design.


The flow stop at the storage.
The gradient is the key.
Size come secondary.






3 Wisdom from our Founders Generation:



One:

It is in PUB design code that water flow in non-raining season must be at least 1m/sec.
It is clear at Bukit Timah Canal, even in the rain, the speed is less than 1m/sec.
Veteran standing in front of a zero flow storage show how prevalent this is all over Singapore.


Two

It is in PUB design code if water flow is slower than 1m/sec, you must reduce the size of the drain.
This PUB approach of designing gigantic drains, more drains is against its principles.


Three

It is in PUB design code that drains cannot be too deep.
Weep holes in deep drains discharged rich nutrients that lead to algae.

The immense algae in the drains, rivers, reservoirs is not solely caused by global warming.





2 comments:

  1. Please take photo, video and with similar observation with specific like
    .
    "at the Asia Sq , one side of the rd the water was flooding fast but the opposite side across the road the water subsided very fast also".
    .
    These are things all Singaporeans, visitors can do to help solve our flood, most likely can be totally resolved. We are small island, with steeper slope.
    .
    From here we see Singaporeans not only are able, they are devoted, responsible.
    .
    Keep mass media helping Singapore, better Singapore, Stronger Singaporeans
    .
    Father of the above photographer observe:

    you r right that Shenton Way was flooded around 1 p.m. pls see the photo captured by my son fm Shenton House. my son told me that on the road at the Asia Sq , one side of the rd the water was flooding fast but the opposite side across the road the water subsided very fast also. he suspected there could hv some designing faults of the pipes.

    ReplyDelete
  2. Please educate me why our flood subside before rain stop?
    i have some explanations, but i want to hear more wisdom!

    ReplyDelete