Precast L-Wall Stormwater Detention System
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Solution Overview
Problem
Current stormwater detention systems are labor-intensive, costly, and inefficient, with limited detention capacity, requiring extensive excavation, many pieces to install, and a large footprint, which can lead to premature repairs and safety issues.
Innovation Solution
The system employs precast and prestressed concrete elements, including L-wall, T-wall, and double-T members with pockets, arranged to form an outer wall and inner support structures, along with a roof, to create a more efficient and robust stormwater detention system with increased capacity and reduced installation time and land use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional precast modular systems (STORMPOD, STORMTRAP) are used, then stormwater detention capacity is provided, but the systems require extensive excavation, many precast units, and are very labor-intensive in manufacturing, shipping and installation
Solution Approach 1:
The system divides the detention structure into modular precast concrete elements (walls, floors, roofs, access chambers) that can be manufactured separately and assembled on-site. This segmentation enables parallel manufacturing and simplifies installation while maintaining detention capacity.
Solution Approach 2:
The system combines multiple functions into integrated precast elements: structural support, water detention, and access points are merged into a unified modular system. The precast elements are designed to work together as a complete assembly, reducing the number of separate components needed.
2Reliability
If traditional precast modular systems are used, then stormwater detention is achieved, but the systems require extended time at the project site for excavation, drainage, sub-base, select subgrade material placement and installation
Solution Approach 1:
Critical structural elements (walls, floors, roofs) are precast in advance at a manufacturing facility, allowing site preparation and element fabrication to occur simultaneously. This preliminary action eliminates waiting time during on-site assembly and reduces overall construction schedule.
3Strength
If access chambers are limited in traditional systems, then structural integrity is maintained, but maintenance needs to be performed manually and poses maintenance issues
Solution Approach 1:
The system incorporates built-in access chambers that enable maintenance personnel to enter and service internal components (pumps, screens, outlets) without external equipment. This self-service capability allows routine maintenance to be performed from within the structure, improving accessibility while maintaining structural integrity.
Data Source
AI summary
Systems and methods for stormwater detention. An outer wall comprising L-wall members arranged side by side, each comprising a vertical stem having a height h and a width w, and a base of width w connected to the stem and extending outward therefrom at a horizontal angle. At least a first portion of the L-wall member stems having a pocket extending a distance d from a top surface of the stem towards the base, where d<h. The pockets may be positioned midway of the stem width. At least a second portion of the L-wall member stems devoid of a pocket. Optionally, support walls also having a pocket. A roof of double-T roof members each having a span, a flange, and two webs, the webs having first and second ends engaged with one of the pockets of the stems of the L-wall members.