| The expansion of the Smith Lake
Reservoir and Aquia Dam was an interesting and
challenging blend of civil construction. To increase the
water capacity of the reservoir, the existing earthen
dam elevation had to be raised and reinforced, with
appropriate safety enhancements incorporated. A new
spillway, slurry curtain wall cut-off trench, and
overtopping armorment were constructed features of the
dam modification, as well as major alterations to the
water supply and control structures. One of the most
innovative techniques was the use of roller compacted
concrete (RCC) for the overtopping armorment and slope
protection. RCC overlays provide earthen dams the safety
and reliability of conventional-slump concrete, but at a
considerably reduced cost.
During construction, environmental and public safety
issues had to be addressed. The reservoir provides water
to a lot of people in the area, making it essential to
maintain an adequate and uncontaminated supply. Erosion
and sediment control were also vital, as well as
protecting the down stream flow so that the existing
ecosystem was not damaged.
So, how did we do? Keith Dayton, Capital Improvements
Program Manager for the Stafford County Utilities
Administration, had this to say...
"The expansion of the dam at Smith Lake was
confronted with more than the fair share of challenges,
including record snowfalls and the remnants of three
hurricanes. The fact that the job was completed on time
and within budget speaks volumes about the initiative
and "can do" attitude of Branch Highways, Inc."
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