Making Lake Ralph Hall water-tight
By Upper Trinity Regional Water District
Dec 29, 2021
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Fannin County, Texas -- Ever wondered why water doesn’t just seep underneath a dam? A slurry trench—only 3 ft. wide but nearly 60 ft. deep in some areas—explains why.

Crews began work on it just this month. As the trench is dug, it is filled with highly water-resistant materials including bentonite, sand and gravel to form a kind of underground wall.

This wall will be around 23 times less permeable than the regular soil and foundation materials, keeping water from seeping out of the future lake.

Digging the 60-ft-deep slurry trench at Lake Ralph Hall in southeastern Fannin County.