Surface-Mounted Floodwall System with Shallow Excavation
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Solution Overview
Problem
Conventional floodwalls require deep excavations, which are not feasible in areas with complex underground systems, and temporary floodwall systems are prone to failure under repeated use.
Innovation Solution
A surface-mounted floodwall system with shallow excavation, comprising concrete sections with a deep footing and a wall section, connected by impermeable seals, featuring a sliding access gate and a plumbing system for water management, allowing for minimal site excavation and robust flood protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional floodwalls with deep foundations are used, then flood protection capability is improved, but excavation depth requirement increases making them infeasible in areas with complex underground systems
Solution Approach 1:
The floodwall system is divided into modular sections (e.g., 10ft, 20ft, 30ft lengths) that can be assembled in series. Each module contains integrated foundation elements (footings, piles, or ground beams) that provide individual stability without requiring deep continuous excavation. This segmentation allows the system to achieve reliable flood protection through cumulative modular strength while maintaining shallow individual excavation depths suitable for sites with underground utilities.
Solution Approach 2:
The foundation elements are nested within or integrated with the wall structure itself. Footings, piles, and ground beams are positioned within the wall module footprint, eliminating the need for separate deep excavation zones. This nested arrangement provides deep-foundation-level stability while keeping the overall excavation depth shallow and compatible with sites containing buried electrical, plumbing, or other underground systems.
2Ease of manufacture
If temporary floodwall structures are used to avoid deep excavation, then ease of installation is improved, but reliability under repeated use deteriorates
Solution Approach 1:
The system provides dynamic adaptability through multiple foundation configuration options (footings, piles, ground beams) that can be selected based on site-specific soil conditions and flood loads. This dynamic design allows the same modular wall structure to achieve permanent-grade reliability in varied environments while maintaining relatively simple installation procedures. The foundation type can be adjusted without changing the overall system approach, enabling reliable performance under repeated use.
Solution Approach 2:
The floodwall modules utilize composite construction combining concrete, steel reinforcement, and geosynthetic materials to achieve durability comparable to permanent structures. The composite material system provides enhanced strength, crack resistance, and longevity while maintaining modular assembly advantages. This composite approach eliminates the temporary-structure limitation, enabling the system to withstand repeated flooding events over extended service lives.
3Ease of manufacture
If surface-mounted floodwall sections with shallow excavation are used, then ease of installation is improved, but resistance to hydrostatic and hydrodynamic forces may deteriorate
Solution Approach 1:
The foundation elements (footings, piles, ground beams) are designed to counterbalance hydrostatic and hydrodynamic forces acting on the wall. These elements provide anchoring resistance and overturning moment counterweights that enable shallow-mounted walls to resist forces comparable to deeply-founded structures. The counterweight effect is achieved through strategically positioned concrete and steel masses within the shallow foundation footprint, maintaining strength without requiring deep excavation.
Solution Approach 2:
The system transitions from relying solely on vertical depth for stability to utilizing horizontal distribution and three-dimensional anchoring. Multiple foundation elements are distributed across the wall footprint in plan view, creating a wide-based stable structure. This dimensional shift allows shallow excavation to provide equivalent stability to deep foundations by spreading load resistance across a broader horizontal area while maintaining vertical force resistance through integrated foundation-wall connectivity.
Data Source
AI summary
A static floodwall system that includes at least one floodwall section, and may include an access gate. The access gate may include a motor, control box, and drive system for moving a gate panel between open and closed positions. The static floodwall system may further include a plumbing system for transporting rain water from a dry side to a wet side. The floodwall system may be installed such that it is surface mounted, requiring minimal excavation. Methods of installing the floodwall system include creating a shallow excavation, adding compact fill and a top layer to the excavation site, and installing the floodwall section(s) on the top layer.