It is highly unlikely that Bangkok will be dry within 10 days as there are still 900 million cubic metres of water mass to be managed above Bangkok while on the westen front (Thonburi) there are about 1,000 million cubic metres waiting to flow in.
Dr Seri gave the reason that when floodwater creeps into Bangkok, the area is getting flatter and flatter and thus the water travels even slower than anticipation. Even if BMA's drainage capacity can drain Bangkok dry within 10 days, it does not mean that floodwater will be there to be drained off completely by that timeframe. It is now accepted that Big Bag helps slow the inflow. It is a wise decision to allow two gaps to let some water in as this will lessen the suffering for those above Big Bag as Khlong Bang Sue, which receives floodwater from Khlong Lat Phrao, Khlong Prem Pachakorn as well as from Vibhavadi canals on both sides, can manage to pump the floodwater into Chao Phraya river very well.
If the BMA wants to dry Bangkok quicker, Big Bag gaps must be widened to allow more inflow. But BMA must install more pumps at Khlong Bang Sue to manage the increasing inflow rate. If pumps break down, expect to see floodwater overflowing the canal to travel down to Victory Monument to be met by Khong Sam Sen, restricting even more road space. So it is a balancing act right now.
Good news that Chulalongkorn sluice gate water level continues to decline as well as at other gates. What is worrying is that Khlong Saen Saep above Khlong Bang Chan sluice gate is overflowing banks due to narrowing sluice gate even though the gate is opended fully. The water level below the sluice gate is nearly 1 metre lower than above it. Bang Chan Industrial Estate floodwall is 1.5 metres high, but the floodwater level is now near 1 metre, very risky. Do whatever possible to expedite waterflow along various canals surrounding the estate.
Lat Krabang Industrial Estate is now facing floodwater at the level of about 50-80 cm and overflowing into the estate road itself. However, all factories are protected by floodwalls as high as 3 metres. On Thonburi side, flood head has yet to reach Rama II Rd proper but nearby areas see rising water. The water will come and expect to flood the road in a few days.