question archive Suppose that a section of the circumferential barrier wall described in Example 16-1 is constructed without adequately keying into an underlying layer of low hydraulic conductivity
Suppose that a section of the circumferential barrier wall described in Example 16-1 is constructed without adequately keying into an underlying layer of low hydraulic conductivity
Subject:Civil EngineeringPrice: Bought3
Suppose that a section of the circumferential barrier wall described in Example 16-1
is constructed without adequately keying into an underlying layer of low hydraulic
conductivity. A section of the original material 100 ft long and 3 ft deep remains with
the original aquifer hydraulic conductivity of 1 x 10-2 cm/s (a shallow buried valley).
What would the leakage through the wall be from this zone? Would this jeopardize
the success of the associated pump-and-treat system?
EXAMPLE 16-1. VERTICAL BARRIER HYDRAULIC CONDUCTIVITY. A 0.75-m (30-in)
thick circumferential barrier is planned to control the influx of clean groundwater to ex-
traction wells. The cost-effective treatment plant capacity is 3.2 x 10' m'/s (5 gal/min).
The perimeter is 900 m (3000 ft) in length and the aquifer is 9 m (30 ft) thick. An inward
gradient across the barrier wall will be maintained by lowering the water level within
the containment by 1.5 m (5 ft). What must the hydraulic conductivity of the wall be to
control the influx through the wallto 3.2 x 10-4 m'/s (5 gal/min)?
