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2. Mexico–United States border wall - Wikipedia

   en.wikipedia.org/wiki/Mexico–United_States...

   The United States Border Patrol in the Algodones Dunes, California A section of the barrier, made out of steel slats, ending in the Pacific Ocean in San Diego–Tijuana Douglas, Arizona, 2009 The border fence between El Paso and Juarez has an elaborate gate structure to allow floodwaters to pass under. The grates prevent people being able to ...

3. IHNC Lake Borgne Surge Barrier - Wikipedia

   en.wikipedia.org/wiki/IHNC_Lake_Borgne_Surge_Barrier

   Navigation gates where the barrier crosses the GIWW and Bayou Bienvenue can be worked to reduce the risk of storm surge coming from Lake Borgne and/or the Gulf of Mexico. Another navigation gate ( Seabrook Floodgate ) has been constructed in the Seabrook vicinity, where the IHNC meets Lake Pontchartrain , to block a storm surge from entering ...

4. Border barrier - Wikipedia

   en.wikipedia.org/wiki/Border_barrier

   A border barrier does not usually indicate the location of the actual border, and is usually constructed unilaterally by a country, without the agreement or cooperation of the other country. Examples of border walls include the ancient Great Wall of China, a series of walls separating China from nomadic empires to the north. The construction of ...

5. Ha-ha - Wikipedia

   en.wikipedia.org/wiki/Ha-ha

   Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward. A ha-ha (French: hâ-hâ [a a] ⓘ or saut de loup [so də lu] ⓘ), also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier (particularly on one side) while preserving ...

6. Bremer wall - Wikipedia

   en.wikipedia.org/wiki/Bremer_wall

   A Bremer wall, or T-wall, is a twelve-foot-tall (3.66 m) portable, steel-reinforced concrete blast wall of the type used for blast protection throughout Iraq and Afghanistan. The Bremer barrier resembles the smaller 3-foot-tall (0.91 m) Jersey barrier, which has been used widely for vehicle traffic control on coalition military bases in Iraq ...

7. Floodgate - Wikipedia

   en.wikipedia.org/wiki/Floodgate

   Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams , to adjust flow rates in sluices and canals , or they may be designed to stop water flow entirely as part of a levee or storm surge system.