When I need tide data in a hurry, I tend to visit the Mobile Geographics site for Sembawang – this link provides the year’s data: http://www.mobilegeographics.com:81/calendar/year/5729.html
Then I use the “find” (cmd-F) command to search for, in this case, “September”. The data for the month scrolls up and I can check the tides for the International Coastal Cleanup Singapore.
The coastal cleanup is always conducted on the 3rd Saturday of September every year on he beaches. It’s just a question of whether the mangrove cleanups will be conducted the same day.
As it turns out, it IS a low tide that morning:
20 Sep 2008
7:49 AM SGT – 1.17 m
2:13 PM SGT – 3.10 m
This means the mangrove cleanup will take place the same day as the beach cleanup.