Flood barrier and a method for forming a flood barrier
AssigneeBaroid Technology, Inc.
InventorAndrew Liao
Life of this patent
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Abstract
A trench is excavated from the top surface of an earthen dike, all the way down into the foundation below the base of the dike. Dry powder, partially hydrolyzed polyacrylamide (PHPA) is mixed with fresh water and soda ash in proportions of 20 lbs PHPA, to 4 lbs of soda ash, to 68 barrels of fresh water (2856 gallons) to form a slurry having a funnel viscosity of at least 45 sec/quart. As the trench is being excavated, the slurry is pumped into the trench immediately. A section of geo-membrane having a thickness of 0.080" is placed in the trench all the way to the bottom of the trench, overlapping at the top of the membrane onto the top surface of the dike. Dry sand is then pumped into the trench to displace the slurry in the trench.
Claims10
A method for forming a drainage trench in a dike, comprising:
- excavating a trench in the top surface of said dike;
- filling said trench with a slurry comprised of fresh water and PHPA;
- and
- filling said trench with sand, thereby replacing at least a portion of said slurry of water and PHPA used to fill said trench.
A process for forming a drainage trench in a dike, comprising:
- excavating a trench in the top surface of said dike;
- at least partially filling said trench with a slurry prepared by mixing fresh water and dry PHPA, the amount of dry PHPA with respect to the volume of fresh water being mixed being selected to provide a funnel viscosity of the slurry of at least 45 sec/quart;
- and
- pumping sand into said trench to at least partially displace the slurry in said trench.
Dependencies are inferred from the claim text.