Drainage, Weir and Debris-Screen Design Details

Expanded the erosion-remediation scope into a complete civil and hydraulic stormwater-control design.

Designed protection for the tank slab.

Designed measures to reduce washout risk.

Designed control of high-velocity roof runoff.

Designed drainage access and debris control to improve maintainability.

Developed a permanent drainage route for future upgrades.

Uncontrolled roof runoff created subgrade voids and slab-edge risk, so the site needed source capture, reinforced conveyance, debris screening, step-down energy dissipation, outlet protection, and phased stabilization.

Defined drainage design criteria: 545 GPM design basis, 135-ft reinforced concrete channel, 1-ft channel width, 12-in depth, 4% slope, #4 rebar, 8 in x 8 in stainless gutters with five 4 in x 5 in downspouts, 85 ft x 4 ft x 2 ft Phase 1 void, and 445 anchor. Added 4,375 cf/hr / 1.215 cfs design runoff basis at 6 in/hr; alternative 3.5 in/hr/ 2,555 cf/hr/ 318.7 GPM as design-check only; 12-18 in sidewall height; 6-in reinforced sidewalls/base; 5-7 ft/s target velocity; rectangular/U-shaped channel; flared transition to weir; expansion joints every 12-15 ft; control joints every 6 ft; 8 in crushed stone base; geotextile; 4 in perforated PVC relief lines; riprap/gabion transitions; reinforced apron; keyway/interlocking base; 12-in steel dowels every 4 ft; geo-cellular confinement / erosion-control matting; debris grates/screens.

Improved stormwater-control design and phased execution readiness.

Advanced stormwater-control design using a 545 GPM basis, a 135-ft reinforced channel, a five-step/55-ft weir, 34-degree debris-screen tilt, a 10 ft by 15 ft by 2 ft outlet basin and a Phase 1 stabilization package. The scope coordinates gutters, downspouts, channels, screens, weirs, outlet energy dissipation and slab stabilization.

Advanced tank-slab protection design.

Advanced drainage maintainability design.

Advanced phased construction readiness.

Design runoff basis: 545 GPM.

Design runoff basis: 4,375 cubic feet/hour, or approximately 1.215 cubic feet/second.

Specified channel length: 135 ft.

Specified channel slope: 4%.

Specified weir arrangement: five 5-ft drops.

Specified total weir length: 55 ft.

Specified total weir height: 25 ft.

Specified step length: 11 ft.

Specified width where used: 7 ft.

Specified outlet basin: 10 ft by 15 ft by 2 ft.

Specified debris-screen tilt: 34 degrees.

• Project Ownership

  Full lifecycle project ownership

  Owned the full project lifecycle: capital planning and prioritization, need definition, feasibility and scope development, engineering and AFE justification, procurement and vendor coordination, construction sequencing and field oversight, commissioning, turnover, and post-startup support. Connected operating requirements with technical scope, funding decisions, execution readiness, and the needs of operations and maintenance.

Owned the full project lifecycle: capital planning and prioritization, need definition, feasibility and scope development, engineering and AFE justification, procurement and vendor coordination, construction sequencing and field oversight, commissioning, turnover, and post-startup support. Connected operating requirements with technical scope, funding decisions, execution readiness, and the needs of operations and maintenance.

Developed the reinforced channel, debris screens, five-step weir, outlet basin and stabilization scope. Curbing, grading, landscaping and wastewater-collection interfaces were coordinated with the work. The system reduced sediment carry by more than 90 percent while providing a maintainable runoff path.

• Civil, Structural, Concrete, and Site Engineering — Application ReviewCapability application review
• Stormwater, Drainage, and Erosion Control — Application ReviewCapability application review