{"product_id":"automatic-flood-barriers","title":"Oyster - Automatic Flood Barriers (Custom Quote)","description":"\u003ch2\u003eOyster™ Self-Rising Mechanical Flood Gate\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAutomatic flood protection for garages, driveways, loading docks, transit entrances and other downward-sloping access points.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Garrison Oyster™ Self-Rising Mechanical Flood Gate is a hydrodynamic, water-activated flood barrier designed to protect downward-sloping entrances, including parking garage ramps, driveway ramps, transit and subway station openings, loading docks, tunnels and other below-grade access points.\u003c\/p\u003e\n\u003cp\u003eUnder normal conditions, the Oyster™ flood gate remains flat on the ramp, allowing vehicles and pedestrians to pass freely. When floodwater approaches, water enters the barrier's internal cavities and creates buoyancy that automatically raises the panel into a vertical flood wall. No electricity, motors or manual deployment are required. Once flood conditions subside, the system can be returned to its closed position.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1021\/6426\/7291\/files\/Deployed_Barrier_2.webp?v=1793722600\" alt=\"Oyster self-rising mechanical flood gate deployed\"\u003e\u003c\/p\u003e\n\u003ch3\u003eHow the Oyster™ Automatic Flood Gate Works\u003c\/h3\u003e\n\u003cp\u003eThe Oyster™ flood gate uses a passive hydrodynamic mechanism within each module to detect rising water and automatically raise the flood panel, creating a protective barrier against incoming floodwater.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandby – Dry Conditions\u003c\/strong\u003e\n\u003cp\u003eVehicles and pedestrians can pass normally over the anti-skid driving surface. The flood panels remain flush with the concrete or sit directly on top of the existing surface.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRising Water \u0026amp; Activation\u003c\/strong\u003e\n\u003cp\u003eAs floodwater approaches, it flows through the inlets into internal water-storage cavities within each module.\u003c\/p\u003e\n\u003cp\u003eBuoyancy acts on internal flotation plates, which then push the rotating flood panel upwards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Deployment\u003c\/strong\u003e\n\u003cp\u003eWhen the water reaches the design activation threshold, the flood gate modules rise into position and lock into a near-vertical flood wall.\u003c\/p\u003e\n\u003cp\u003eContinuous ramp seals and flexible side-wall seals create a tight seal to help prevent water from entering the protected opening.\u003c\/p\u003e\n\u003cp\u003eThe Oyster™ system is fully passive and does not require human intervention to deploy.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControlled Drainage \u0026amp; False Deployment Prevention\u003c\/strong\u003e\n\u003cp\u003eIntegrated drainage and water outlet controls allow small amounts of water to drain away, helping prevent unnecessary deployment caused by shallow ponding. The barrier rises only when incoming flow exceeds the drainage capacity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter the Flood\u003c\/strong\u003e\n\u003cp\u003eOnce the flooding event has ended, water drains from the internal cavities. Operators can then follow the required procedure to lower the panel back to its flat position and visually check the seals and hardware before the next use.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/7f72e2c9-b093-4467-ac7e-5a416e92d8ac\/Array+of+Closed+panel.png\" alt=\"Oyster flood gate in closed position\"\u003e\u003c\/p\u003e\n\u003ch3\u003eOyster™ Barrier Closed Position\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/33405107-e007-41b1-ae59-f65c9dcfe9b7\/Array+of+Panrel+open+front+iso.png\" alt=\"Oyster flood gate panels in raised position\"\u003e\u003c\/p\u003e\n\u003ch3\u003eOyster™ Flood Gate Open Position – Dry Side\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1021\/6426\/7291\/files\/Array_of_panels_open_back.jpg?v=1793723080\" alt=\"Oyster flood gate open position from the dry side\"\u003e\u003c\/p\u003e\n\u003ch3\u003eOyster™ Automatic Flood Gate Open Position – Water Side\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1021\/6426\/7291\/files\/Screenshot_2026-11-03_212514.png?v=1793723139\" alt=\"Oyster automatic flood gate water side\"\u003e\u003c\/p\u003e\n\u003ch3\u003eWhy Use Oyster™ Self-Deploying Flood Barriers?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Automatic Operation – No Power Required\u003c\/strong\u003e\n\u003cp\u003eThe hydrodynamic system rises using the ballast of incoming floodwater. No electricity, pumps, motors or staff deployment are required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive-Through Safe\u003c\/strong\u003e\n\u003cp\u003eThe four-layer, heavy-duty panel structure is designed to support vehicle loads. Cars and light trucks can pass over the closed barrier and, where required and within design limits, safely drive out over the ramp even when the barrier is raised.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat, Low-Profile Design When Not Deployed\u003c\/strong\u003e\n\u003cp\u003eThe panels can be installed in-ground or positioned on top of concrete, with a ramped thickness of approximately 2.0–3.9 inches.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModular \u0026amp; Adaptable\u003c\/strong\u003e\n\u003cp\u003eStandard flood gate modules are approximately 23.6 inches wide, while non-standard filler units are available in 6.3, 11.4, 13.2 and 18.5-inch widths. This modular approach allows the system to match a wide range of ramps and openings.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Side Sealing System\u003c\/strong\u003e\n\u003cp\u003eAdjustable side seals and optional Z-profile gap fillers accommodate variations in wall alignment. Depending on the protection height, the distance between the barrier and wall can generally range from approximately 2.0–5.9 inches.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn-Ground or Surface-Mounted Installation\u003c\/strong\u003e\n\u003cp\u003eA recessed embedded frame can be selected for new construction, while a surface-mounted frame is suitable for retrofit projects where cutting into the slab is not practical. Both installation methods use the same core barrier modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Maintenance \u0026amp; Long Service Life\u003c\/strong\u003e\n\u003cp\u003eThe system uses aluminium, aluminium castings, 316L stainless steel and nodular cast iron, together with EPDM or silicone rubber sealing components.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProven Performance\u003c\/strong\u003e\n\u003cp\u003eThe Oyster™ passing flood gate system has been used at hundreds of installations globally and is designed for repeated flood protection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/dfa3d1c0-265c-4436-9ea8-80a0ee9064c9\/oyster_icons4_durable.png\" alt=\"Durable Oyster flood gate construction\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDurable\u003c\/strong\u003e\u003cbr\u003eBuilt using durable materials, hardware and construction for long-term use.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/8a6d66cc-285c-4f83-afff-46f655189081\/oyster_icons6_auto_rises_hydrostatic.png\" alt=\"Oyster flood gate automatically rises using hydrostatic pressure\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAutomatically Rises\u003c\/strong\u003e\u003cbr\u003eThe passive flood gate rises automatically using hydrostatic pressure, without electricity or battery power.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/ee34a398-da7d-42fb-8eb1-2183b64e4b4d\/oyster_icons5_3_heights.png\" alt=\"Oyster flood gate available in three heights\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3 Heights\u003c\/strong\u003e\u003cbr\u003eAvailable in 24, 36 and 48-inch heights, depending on the required flood protection level.\u003c\/p\u003e\n\u003ch3\u003eLearn About the Oyster™ Self-Rising Automated Flood Gate\u003c\/h3\u003e\n\u003cp\u003e\u003ciframe width=\"100%\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/dnQLQB7xFhs?rel=0\" title=\"Oyster Self-Rising Automated Flood Gate\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch3\u003eAutomatic Flood Gate System Components\u003c\/h3\u003e\n\u003cp\u003eThe Oyster™ self-rising flood gate system is built from standard modules combined with non-standard filler modules and flexible side seals at each wall. Two installation methods are available:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface-mounted:\u003c\/strong\u003e Panels are fastened to the top of existing concrete or asphalt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmbedded\/In-ground:\u003c\/strong\u003e Panels are installed using a recessed concrete installation method.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDeployment operating principle:\u003c\/strong\u003e The system uses passive hydrodynamic buoyancy and requires no external power. Panels automatically flip upwards without electricity or manual intervention.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptional control \u0026amp; alarms:\u003c\/strong\u003e A local battery-powered alarm box or control panel can be used to signal deployment status and provide audible or visual alerts.\u003c\/p\u003e\n\u003ch3\u003eStandard Flood Gate Modules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard width:\u003c\/strong\u003e Approximately 23.6 inches per module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective width with splice:\u003c\/strong\u003e 23.75 inches, allowing for spacing around joint hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable water-retaining heights:\u003c\/strong\u003e 24, 36 and 48 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePanel thickness:\u003c\/strong\u003e 2 inches for 24-inch panels; 4 inches for 36- and 48-inch panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/67de361c-605b-4f65-b309-ce0850ff379c\/water_img%2B%283%29+%287%29.jpg\" alt=\"Oyster flood gate standard modules and water protection\"\u003e\u003c\/p\u003e\n\u003ch3\u003eNon-Standard Filler Modules\u003c\/h3\u003e\n\u003cp\u003eFor closer fitting around different opening dimensions, Oyster™ uses narrower filler modules. These can be combined with standard modules to accommodate variations in opening width and provide a closer fit to side walls.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable filler widths:\u003c\/strong\u003e 6.3, 11.4, 13.2 and 18.5 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e For a 9-foot opening, four 23.75-inch standard units plus one 6.3-inch filler create a 101.3-inch section (8 feet 5.3 inches). The remaining 4.7 inches can be accommodated using flexible rubber side-wall seals on either side of the opening.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/d2af7518-fddb-454d-80ce-5fc0fb272c58\/Oyster+GIF+-+V4+Compressed.gif\" alt=\"Oyster flood gate automatic deployment demonstration\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFlexible Side-Wall Seals\u003c\/h3\u003e\n\u003cp\u003eFlexible rubber sealing plates span the remaining distance between the flood gate panels and the side walls. As the flood barrier rises, these seals flex upwards to maintain a secure seal along both sides of the opening.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTypical design ranges – distance from wall to main frame:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-inch height:\u003c\/strong\u003e Preferred wall distance 2.4–3.9 inches; tolerance 2.0–4.3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36-inch height:\u003c\/strong\u003e Preferred wall distance 3.1–4.7 inches; tolerance 3.1–5.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e48-inch height:\u003c\/strong\u003e Preferred wall distance 3.9–5.5 inches; tolerance 3.5–5.9 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTriangular side seals are fixed to the wall using stainless steel strips and anchors and are sized specifically for each required protection height.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/bc2f4085-e655-4498-a704-d4ae96efeed0\/Panel+Sizes+Screened+Background.png\" alt=\"Oyster flood gate panel sizes\"\u003e\u003c\/p\u003e\n\u003ch3\u003eRamped Edge Pieces\u003c\/h3\u003e\n\u003cp\u003eFor surface-mounted installations, standard powder-coated steel ramps or wider, more pedestrian-friendly ramp options can be selected. Wider ramps are suitable for non-vehicular access areas such as transit systems, malls and lobby entrances.\u003c\/p\u003e\n\u003cp\u003eIn-ground Oyster™ systems use powder-coated steel filler sections in place of ramp components.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/f2d8cdf3-2314-4d95-ab08-15809949babb\/Panels+and+end+gable+rubber+seal+complete.png\" alt=\"Oyster flood gate panels and side rubber sealing system\"\u003e\u003c\/p\u003e\n\u003ch3\u003e3 Heights Depending on Expected Flood Depth\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/bef41bdf-04a9-4e37-96df-6cc3276c70a6\/Standard+Panel+surface+mount+Open+Front.png\" alt=\"Oyster standard flood gate surface mount open front\"\u003e\u003c\/p\u003e\n\u003ch3\u003eFlexible Triangular Side Seals Help Prevent Leakage Where the Oyster™ Flood Barrier Meets the Wall\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/images.squarespace-cdn.com\/content\/v1\/60e5f1697187fc1d195aa488\/681a2c94-620a-4a36-97ec-8a5f5bf8ae12\/Standard+Panel+surface+mount+Open.png\" alt=\"Oyster standard flood gate surface mount\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1021\/6426\/7291\/files\/Oyster_spec_sheet_20261007.pdf?v=1793900783\" rel=\"noopener\" target=\"_blank\"\u003e \u003cstrong\u003eView Specification Sheet\u003c\/strong\u003e \u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eConstruction \u0026amp; Materials\u003c\/h2\u003e\n\u003cp\u003eEach standard Oyster™ flood gate panel is a four-layer composite engineered for strength, buoyancy and skid resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePanel Construction\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Skid Surface Layer\u003c\/strong\u003e\n\u003cp\u003eAluminium tread top layer with anti-slip texture for vehicle and pedestrian safety.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad-Bearing Layer\u003c\/strong\u003e\n\u003cp\u003eHeavy-duty cast-aluminium structure designed to handle vehicular traffic and rated for garage and ramp applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuoyancy Layer\u003c\/strong\u003e\n\u003cp\u003e316L stainless steel structure with electrophoretic coating and spray finish, creating sealed cavities for buoyant elements that lift the panel.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective Underside Layer\u003c\/strong\u003e\n\u003cp\u003e304 stainless steel protects the buoyancy system from impact and corrosion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Frame\u003c\/strong\u003e\n\u003cp\u003eBase frame and structural plates are manufactured from aluminium and aluminium castings.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eOther Key Elements\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide sloped sections:\u003c\/strong\u003e Nodular cast iron or 304 stainless steel, depending on the selected Standard or Pedestrian style.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealing components:\u003c\/strong\u003e EPDM or silicone rubber, including ground seals, inter-panel seals, side seals and wall seals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1021\/6426\/7291\/files\/Screenshot_2026-11-03_213416.png?v=1793723682\" alt=\"Oyster flood gate construction and installation details\"\u003e\u003c\/p\u003e\n\u003ch3\u003eShipping\u003c\/h3\u003e\n\u003cp\u003eShipping quoted separately: Shipping for Garrison Flood products is customized based on the product and delivery location and is not included in the listed price. Purchase your product now to receive a separate shipping quote afterward, or contact Home Power Tech before ordering at support@homepowertech.com or call\/text 727-334-0176. We’ll confirm the shipping cost with you before arranging shipment.\u003c\/p\u003e","brand":"Garrison Flood","offers":[{"title":"Default Title","offer_id":54502210830619,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1021\/6426\/7291\/files\/oyster-automatic-flood-barriers-custom-quote-6614343.webp?v=1794078459","url":"https:\/\/homepowertech.com\/products\/automatic-flood-barriers","provider":"Home Power Tech","version":"1.0","type":"link"}