The first photo shows how the water used to flow from one pan to the next, through these large tubes. They have been filled with cememt. The second photos show the new weir system with a baffle that more efficiently allows water to flow from one pan to the next. This would be similar to something in the States.

Name:  Jamaica 2012 Negril Treatment Plant  IMG_4052.jpg
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Name:  Jamaica 2012 Negril Treatment Plant  IMG_4021.jpg
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Regards,
Bob