Tybee Island - Initial Case Study

High Water Levels
Surface water flooding
Tidal Water

Location: Tybee Island, a city and a barrier island located in Chatham County, Georgia, USA.

Background: Tybee Island is sensitive to high water levels due to the lack of elevation on the island.  High sea levels have a tremendous impact on the island, as does high sea levels to most of the low lying southern East Coast of USA.  High rainfall events can also impact the island, causing flooding from inland.  This rainfall combined with high sea levels puts infrastructure to the test.
Prior to the installation of WaStop Inline Check Valves, the City of Tybee island trialled other check valves with unsatisfying results. The solution was to provide a complete seal against backflow, in high and low pressure situations.  This is one area WaStop excels.

Problem: Tybee Island needed reliable and functional valves to stop back flow from the ocean, whilst draining water from upstream. High tide events would lead to dry-weather flooding on streets caused by backflow in the stormwater network.  The backflow of sea water often filled the stormwater system which in turn reduced retention capacity and rendering the stormwater system useless even in normal rainfall events.  This lead to wide spread flooding in residential areas.

Solution: A quick and easy installation of a WaStop Check Valve in a catch basin protects the lowest lying areas and critical pipes. Areas similar to Tybee Island such as Fort Lauderdale, St Augustine and Miami Beach struggle with the same kind of flooding problems. Most products on the market require considerable back pressure in order for the valve to close and stop backflow.  WaStop, however, is closed and sealed against backflow even when there is no backflow pressure thus excelling in tidal applications where pressure builds slowly.  WaStop also ensures that, as long as the differential pressure is higher than the opening pressure, the upstream water will be released even when it's high tide. With an exceptionally low headloss WaStop ensures water is released through the valve with the highest efficiency available.

Conclusion:  Wastop has prevented tidal water from entering the system and no flooding has occurred since the installation despite the recent King Tide. WaStop provides peace of mind and residents can be assured of no more dry-weather flooding.

Wapro - Holding back the flood  

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” Even the newest member of the crew can install this. The installation took less than 25 minutes, even though we didn’t have the right tools to start with”
– Supervisor of the Tybee island project
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