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Breachway Definition
Overtime, an deep cut or inlet on the shore will become closed off due to linear flow of sand. First a spit forms, then the spit extends, and finally, the inlet is closed off, create a pond or "lagoon." Because we like to f with mother nature, which by the way I am not against, we will build a jetty that sticks out to stop the flow of sand, dredge the channel, and hence keep the breach into the pond/lagoon open. Hence the term, Breachway.
This is pretty much the geology of the entire south coast of RI.
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