relatively speaking, banyan/tamalan is located at one the lowest point within precint 6. that is because precint 6 is located at a higher ground. However, if u take whole setia alam into the picture, it is actually on the same level with other areas, like setia impian , setia indah.
regarding the flood, what i know was there was a mini flood near the guardhouse 1-2 yrs ago. That was due to the clogged underground sewerage due to ongoing construction. It was rectified by Sp Setia sometime ago. Since then i didn't witness any flood near the banyan/tamalan area, even during the rainy season end of last year where we experienced one of the heaviest rainhall in the history (almost everyday we had thunderstorm in klang valley). Also, the water retention ponds in setia alam were full almost everyday during last year rainy season, so it shows the retention pond is working properly.
if u are considering banyan/tamalan, i suggest u take the 3rd and 4th row (ie: closer to the ongoing construction of semi-d and the park). The semi-d will be completed end of this year i think. so by the time u move in, the whole area of precint 6 will be completed and no more new construction. However, the land opposite banyan/tamalan belongs to sime darby and they are planning to launch 20x70 DSL this year or next year. So the 1st and 2nd row of banyan/tamalan will face some noise pollution in the next 2-3 yrs. If u want to see the house with the owner/agent, i suggest u come during weekend, around 6pm. u can see community living at its best, ppl are jogging, walking their pets, cycling at the precint 6a central park, etc. pretty nice !

ya, forgot to mention one thing, apart from the newly vp banyan/tamalan, there are also some very limited subsale units for 24x70, facing or near the central park. They are older (completed in 2009/2010 i think) but cheaper, <700k.
Thanks for the detail explanation. Really good to know that P6 is such an interesting place.