I heard the same report, and since I live directly opposite Sukhumvit Soi 50 (on Soi 79), I went to take a look.
From a point 1.8 km southwest of Sukhumvit, I took the photo shown at: http://twitter.com/#!/StoneSoupBKK/status/129822334596038657/photo/1 This was looking southwest.
500 meters to the west, Khlong Prakhanong water level was absolutely normal - see http://twitter.com/#!/StoneSoupBKK/status/129831847847931904/photo/1
and http://twitter.com/#!/StoneSoupBKK/status/129831048124178432/photo/1