It has been drained naturally or man made every year that I have been around, 21 years. The mangrove gets over full and some years more so depending on the rain amount. The water level when high threatens certain homes and roads so a ditch is dug to let off the water. Naturally it would happen on it's own eventually but since humans have built structures and roads it gets drained artificially sometimes, like most years. That's my take on it.
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