Segmented Grate Filtration for Stormwater Debris Capture
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Solution Overview
Problem
Conventional inlet grates in stormwater drainage structures are inadequate for capturing debris during heavy runoff, often clogging or littering, and are cumbersome due to their heavy, unitary design, which complicates access to drainage systems.
Innovation Solution
A filtration apparatus comprising two grates with anchoring members secured to the drainage structure's internal walls, allowing them to be positioned below the inlet to catch debris without obstructing stormwater flow, and can be easily switched between open and closed configurations for access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional inlet grates are used to block debris, then debris is prevented from entering the drainage structure, but stormwater flow is impeded and the grate becomes clogged
Solution Approach 1:
The inlet grate is divided into multiple modular segments that can be independently removed and reconfigured. This segmentation allows maintenance workers to access specific areas for cleaning without removing the entire grate structure, thereby maintaining stormwater flow while enabling effective debris removal.
Solution Approach 2:
The grate system incorporates movable and adjustable components that allow dynamic reconfiguration based on debris accumulation. The modular segments can be shifted or removed to maintain optimal flow characteristics while providing continuous debris blocking capability.
2Strength
If conventional unitary grates are used, then structural strength is sufficient, but access to the drainage cavity requires lifting the heavy entire grate
Solution Approach 1:
The grate is segmented into multiple lighter modules that can be independently handled. Workers can remove individual segments to access the drainage cavity without lifting the entire heavy grate structure, significantly improving ease of operation while maintaining overall structural integrity through the modular assembly.
Solution Approach 2:
The modular grate system allows access through removal of individual segments rather than requiring vertical lifting of the entire structure. This dimensional change in access methodology transforms a vertically-oriented heavy lifting operation into a horizontally-oriented modular assembly/disassembly process.
3Object-affected harmful factors
If inlet grates are designed with small openings to block debris, then debris capture is improved, but the grate openings become clogged more easily
Solution Approach 1:
The grate comprises multiple segments with varying opening sizes and configurations. This segmentation allows different zones to handle different debris sizes, with larger openings preventing clogging while smaller openings provide enhanced debris capture in specific areas, maintaining overall reliability.
Solution Approach 2:
Different segments of the grate have locally optimized opening characteristics tailored to specific debris types and flow conditions. This local quality variation enables enhanced debris capture where needed while maintaining adequate flow capacity through strategically placed larger openings, preventing overall clogging.
Data Source
AI summary
A filtration apparatus for use with drainage structures and a method for installing the same are provided. The filtration apparatus has a first grate and a second grate, which, when installed and secured together, establish a filtration barrier between the inlet and bottom of a drainage structure for filtering stormwater runoff entering the drainage structure. The first grate and second grate are secured to internal walls of the drainage structure via anchoring members. The anchoring members allow each of the grates to rotate to facilitate transition of each grate from a hanging to a suspended position. A connecting member secures the first grate and the second grate together so that the grates bisect the cavity of the drainage structure.