Crabtree Creek Quarry Pit Structure
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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Crabtree Creek, located near Raleigh, NC is prone to flooding in the Crabtree Mall area approximately 4 miles downstream of Umstead State Park. Several retention dams are located upstream of Umstead Park however, a proposed quarry spillway was preferred over a dry dam upstream of the Crabtree Mall. The quarry pit structure was designed to divert 5,374 cfs of the total 8,420-cfs discharge into the existing quarry located about 2 miles upstream of the Crabtree Mall during a 100-year storm event. A pumping station not part of this study was proposed to dewater the quarry after each event. Several spillway designs were tested in a 120-scale model to evaluate hydraulic performance and resulting water levels. The type 3 spillway design, having an 85-ft width in contrast to the original 150-ft width, aligned with the upstream portion of Crabtree Creek, provided the desired flow diversion and distribution. An adjustable weir was recommended downstream of the spillway to allow changes in downstream water levels, if it is desired in the future either to increase or decrease the flow diversion into the quarry. Keywords North Carolina Spillwaysweirs Hydraulic models.
- Hydrology, Limnology and Potamology
- Civil Engineering