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Agenda - 06-18-2024; 8-m - Approval of a Professional Engineering Services Contract with Schnabel Engineering, Inc. for the Lake Orange Intake Tower Rehabilitation-Replacement Project
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Agenda - 06-18-2024; 8-m - Approval of a Professional Engineering Services Contract with Schnabel Engineering, Inc. for the Lake Orange Intake Tower Rehabilitation-Replacement Project
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BOCC
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6/18/2024
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Business
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Agenda
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8-m
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29 <br /> schnabel-eng.com 2. Project References / Lake Orange Intake Tower / 13 <br /> West Fork Eno River Reservoir S. Kees served as PM for end s <br /> of construction phase services <br /> CEDAR GROVE, NC & post-construction services = 1' <br /> _5" <br /> SERVICES The original Phase 2 expansion plan was to construct an <br /> Alternatives Analysis ogee weir on the original broad-crested weir. However, early <br /> Computational Fluid Dynamics during the preliminary engineering phase of the Phase 2 <br /> Model expansion, several issues were identified that made the plan <br /> Construction Contract by the original designers problematic. To obtain data critical <br /> Administration to design decisions, Schnabel developed a 3D computational <br /> Filter Design fluid dynamics (CFD) model. The CFD model, which estimated <br /> spillway performance under various flood conditions, helped <br /> EAP / O&M Manual us to determine chute wall heights, identified zones of high <br /> Reservoir Expansion Planning hydraulic pressures and turbulent spillway flows, and informed <br /> and Design the evaluation of spillway alternatives for the control section. <br /> Seepage Analyses <br /> Slope Stability The alternatives analysis considered labyrinth, ogee, and <br /> Spillway Design piano key (PK) weirs. The labyrinth was eliminated due to size <br /> Subsurface Explorations constraints. Both the ogee and the PK weirs were viable, but <br /> the more compact PK weir was selected because it allowed the <br /> control section to be narrowed by about 45 percent while still <br /> OWNER/CLIENT passing the spillway design flood. Other modifications included <br /> Town of Hillsborough revising the control section layout for stability and adequate <br /> Marie Strandwitz, PE cutoff; increasing the chute slab thickness; raising the height of <br /> P: 919.732.1270 portions of the chute sidewalls; and a filter diaphragm around <br /> E: marie.strandwitz@ the existing concrete box culvert to prevent internal erosion. <br /> hillsboroughnc.gov <br /> Upon substantial completion, this PK weir was only the second <br /> such spillway structure ever constructed in the US, following <br /> AWARDS another Schnabel project in Georgia. During construction, <br /> 2023 ACEC National Honor Schnabel staff provided full-time oversight and contract <br /> Award administration services, allowing construction challenges to <br /> 2022 NC ACEC Engineering be solved quickly and the project to be completed on time. <br /> Excellence Honor Award Construction completed in June 2020. <br /> Build Better.Together. <br />
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