A precast dam structure includes at least two precast segments coupled together via linkages and a flow path structure. The flow path structure defines a flow path having an intake port and a draft port and is associated with at least one of the at least two precast segments. The flow path structure is configured to provide a change in flow direction, either internally or externally, from the at least one of the at least two precast segments.

A precast dam structure includes at least two precast segments coupled together via linkages and a flow path structure. The flow path structure defines a flow path having an intake port and a draft port and is associated with at least one of the at least two precast segments. The flow path structure is configured to provide a change in flow direction, either internally or externally, from the at least one of the at least two precast segments.

The disclosed water barrier systems may include a first mobile water barrier, and adjacent second mobile water barrier, and a translation mechanism for translating the first mobile water barrier and the second mobile water barrier toward each other. Lowering mechanisms may be configured to lower sidewalls of the mobile water barriers. The mobile water barriers may include sealing elements to form water seals between the adjacent mobile water barriers and between the sidewalls and a surface. Related methods of forming a water barrier assembly are also disclosed.

A method for mitigating flooding in existing coastal plain areas includes: A dyke (or dykes) is (are) set/built on seabed outside partial existing coastline of an existing coastal plain area to form an enclosed area; the enclosed area, together with the dyke(s), the reservoir inlet(s) and outlet(s), constitutes a reservoir for containing rainwater; or, part(s) of the enclosed area is (are) of a reclamation area (or reclamation areas). Before the start of forecast heavy rainfall or continuous rainfall, the water level in the reservoir is lowered in advance and the water level of water area for containing rainwater in the existing coastal plain is also pre-lowered, so effective storage capacity for containing rainwater against flooding caused by rainfall in the locality is substantially increased. The present invention is applicable for the flooding control works, reclamation works, roads and highways and their integrated works in existing coastal plain areas.

A retaining wall extension system for extending a retaining wall, wherein the retaining wall includes an existing wall cap having an upper surface defining an elevation of the retaining wall, with the upper surface having a length and a width. The retaining wall extension system includes an extension cap arranged to be received by the existing wall cap of the retaining wall. The extension cap includes a first portion arranged to be received by the upper surface of the existing wall cap, and a second portion integrally formed with the first portion, wherein the second portion extends vertically upward from the first portion so as to extend the elevation of the retaining wall. A method of extending a retaining wall is also provided.

A membrane-lined wall for levee reinforcement or leak prevention, prevention of water migration, and pollution control of impoundments. The membrane-lined wall generally includes a cementitious or concrete wall formed within an excavated trench. The concrete may be internally reinforced, and the wall may also comprise a double-layer of impermeable geomembrane liner that forms a barrier between the concrete and the sides and bottom of the trench. The membrane or liner reduces water migration, prevents levee leakage, and prevents the escape of contaminants in impoundments.

A membrane-lined wall for levee reinforcement or leak prevention, prevention of water migration, and pollution control of impoundments. The membrane-lined wall generally includes a cementitious or concrete wall formed within an excavated trench. The concrete may be internally reinforced, and the wall may also comprise a double-layer of impermeable geomembrane liner that forms a barrier between the concrete and the sides and bottom of the trench. The membrane or liner reduces water migration, prevents levee leakage, and prevents the escape of contaminants in impoundments.

A triadic recurve implosion flood navigation for in-situ tailoring yearn system -[TRINITY - D20] has a tailoring mechanism comprising a first unit having an arc-shaped first arcuate portion, and a second unit having an arc-shaped second arcuate portion, the first and second units stagger each other with concave arcuate surfaces facing opposite directions by center axes of curvature of the first and second arcuate portions parallelling each other to cause an arcuate end of the first arcuate portion locate between two arcuate ends of the second arcuate portion and separated from the concave arcuate surface of the second arcuate portion by a first distance, and to cause an arcuate end of the second arcuate portion locate between two arcuate ends of the first arcuate portion and separated from the first arcuate portion by a second distance, thereby the first and second arcuate portions jointly define a curved channel.

A triadic recurve implosion flood navigation for in-situ tailoring yearn system -[TRINITY - D20] has a tailoring mechanism comprising a first unit having an arc-shaped first arcuate portion, and a second unit having an arc-shaped second arcuate portion, the first and second units stagger each other with concave arcuate surfaces facing opposite directions by center axes of curvature of the first and second arcuate portions parallelling each other to cause an arcuate end of the first arcuate portion locate between two arcuate ends of the second arcuate portion and separated from the concave arcuate surface of the second arcuate portion by a first distance, and to cause an arcuate end of the second arcuate portion locate between two arcuate ends of the first arcuate portion and separated from the first arcuate portion by a second distance, thereby the first and second arcuate portions jointly define a curved channel.

An article for use in damming or channeling surface water flow is comprised of a non-woven polymer fabric sleeve which is encased in a sheath made of polymeric mesh. The sleeve contains a water absorbent material. When water passes through the sheath and sleeve, the absorbent swells up, to change the barrier from a flattened article to a bulky shape article. Preferably, the sleeve is black or brown and the sheath is a mesh comprised of highly visible bright orange fibers; the sheath has a regular pattern of openings nominally equivalent in area to 4 to 5 mm diameter holes; and the sheath has about 25 to about 60 percent open area.