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NC-2009 SSc6.2:Stormwater Design—Quality Control

Default percentage for removal of TSS by dislodging in a lagoon

Hello to all. Hope you can help me with this one. The Municipal Entity of my project requires us to discharge 100% of the stormwater into the City´s Lagoon "Laguna de Terminos" The reason is that there is no sewage system since the water table is at less than a meter from the surface. The project is located in Ciudad del Carmen, in the Yucatan Republic, Mexico. We are doing what is asked by this Entity (sending the water through pipelines and soak ways into the lagoon) and have their approval for the design. My question is: Is there a default rate for TSS removal through natural sedimentation in a lagoon? I know you can check it with municipal entities in order to know the exact amount, but we have asked them and they don't have the data. Thank you for your help. Regards Maria

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Sat, 03/03/2012 - 17:04

Define lagoon. A pond of standing water? Or do you have high and low marsh areas? Plantings?

Mon, 03/05/2012 - 18:42

The Laguna de Terminos is a tropical lagoon estuarine system in the southern Gulf of Mexico, with an area of 1 742 acres, (705 ha). The river Usumascinta flows into this lagoon. The lagoon system is the largest of the country. Including the continental fresh water marine platform, it has also the connections to the sea, freshwater ponds, salt marine estuarie areas, submerged grasses, wetlands and surrounding mangrove forests. Vegetation: Mainly marsh areas with species such as Thalia geniculate where the water stagnation is higher and the Thypa latifolia and Cyperus articulatum in the rest of the lagoon. You can also find Pistia stratiotes and Nymphaea. It is a protected area by the National Institute of Ecology and therefore the quality of water runoff to this lagoon is highly protected. Hope this clears your question Mike. Thanks for your help.
Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Tue, 03/06/2012 - 01:34

Oh, i understand now . you need to remove the TSS from your sites runoff before it gets to the lagoon. You can not use the body of water you are discharging into as the BMP. The idea is not to further pollute the receiving body.

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