20110920 SASC3 To Impede Flow - Over-sized Excessive Depth Waterway

20110920 SASC3 What Impede Flow - Over-sized Excessive Depth
http://bettersingapore.blogspot.com/2011/09/20110920-sasc3-what-impede-flow-over.html


What impede flow - over-sized drains dig excessively deep.
Not only they cost a lot of money, material, labor and maintenance, they impede flow.

Latest project on Alexandra River will not mitigate flood, just from theory all experts use.

First waterway design is a very matured field, not an art, not rocket sciences - just a lot of common sense with keen observation of rain, flow, terrain, soil....
Therefore we can have double confirmation from prior experience and real solutions, not models.

The following two videos show how deeper drains, bigger drains is impeding flow when it is too deep that gradient is sacrificed.


2009 11 05 Hrs 1247 Rain
With gradient, upstream rapid flow can counter right angle interruption.
 Big, deep downstream drain that has almost zero gradient
Simmer this rapid to almost stagnation, dead stagnation
this is a 16MB MP4 your network may take time to load
Do not rely on machines, when machines fail you, please observe around you, there are many zero gradient drains
Complaint cannot make Singapore better
Observe, video, analyse and suggest improvement
Please keep eduating me
2011 09 22 1825hrs Algae Formation 6 hours after Heavy storm that end at 1200 hrs
The rapid flow can push leaves, stick down along 70 meter drain without gradient






this is a 22MB MP4 your network may take time to load
Do not rely on machines, when machines fail you, please observe around you, there are many zero gradient drains
Complaint cannot make Singapore better
Observe, video, analyse and suggest improvement
Please keep eduating me


Drainage without gradient
 is the key to choke, flood, algae, dengue
Gradient is the key in managing water flow.
We must understand, waterway is not rocket science, there must be previous examples, established standards, proven models.

Next will analyse Bukit Timah canal, if we can solve it, we can solve all flood in Singapore.

20110920 SASC1 -  Waterway Design for Global Warming 
20110920 SASC3 What Impede Flow - Over-sized Excessive Depth 
Please help me to Examine, Correct, and Improve 
Strengthen Singaporeans to serve the greater World

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