Semi-Helical Culvert Flow Control for Debris-Flushing Drainage
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Solution Overview
Problem
Conventional culverts experience flow restrictions and debris accumulation, leading to flooding and reduced drainage capacity, especially when operating at or near maximum flow capacity, which can be exacerbated by debris deposition and environmental regulations require unobstructed wildlife passage.
Innovation Solution
A stationary fluid flow enhancing device with semi-helical flow control bodies installed upstream of culverts transforms water flow from parabolic to rotational, enhancing flow capacity and disrupting debris, while maintaining wildlife passage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If culverts operate at maximum flow capacity to handle watershed runoff, then drainage efficiency is improved, but flow restriction and flooding occur when flow exceeds capacity
Solution Approach 1:
The patent applies the dynamics principle by transitioning the flow regime from static parabolic flow to dynamic rotational flow. The semi-helical flow control bodies create a rotating fluid flow that actively responds to varying flow rates, enabling the culvert to dynamically adapt to different watershed runoff conditions and prevent flooding while maintaining high drainage capacity.
Solution Approach 2:
The patent changes the flow regime parameter from parabolic to rotational flow. By introducing semi-helical flow control bodies, the flow pattern parameter is transformed, which fundamentally alters the flow characteristics and enables the culvert to handle exceedance flows without flooding.
2Productivity
If culverts are designed to maximize flow capacity, then drainage performance is improved, but debris accumulation restricts flow over time
Solution Approach 1:
The patent converts the harmful effect of debris accumulation into a beneficial self-cleaning mechanism. The rotational flow generated by the semi-helical flow control bodies creates centrifugal forces that prevent debris from settling and instead flush it through the culvert, transforming the potential harm of debris into a beneficial cleaning action.
Solution Approach 2:
The culvert system performs self-cleaning through the rotational flow mechanism. The semi-helical flow control bodies automatically generate rotational flow that prevents debris accumulation and actively flushes debris through the system without requiring external intervention, making the system self-maintaining.
3Productivity
If culverts are modified to enhance flow capacity, then drainage efficiency is improved, but wildlife passage requirements may be compromised
Solution Approach 1:
The patent applies local quality by creating different flow conditions in different regions of the culvert. The semi-helical flow control bodies generate rotational flow in the central flow path to enhance drainage capacity, while maintaining appropriate flow characteristics in peripheral regions that support wildlife passage, thus satisfying both contradictory requirements simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device increases culvert flow capacity, prevents flooding, and passively cleans debris, meeting environmental regulations by ensuring unobstructed wildlife passage and adhering to fish passage requirements.
Implementation Method 1
transforms water flow from parabolic to rotational, enhancing flow capacity
Implementation Method 2
disrupting debris, while maintaining wildlife passage requirements
Data Source
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AI summary
Fluid flow enhancing devices disclosed herein are adapted to enhance flow of fluid through subsurface watershed conduits, for example, culverts, drainpipe and the like. Such fluid flow enhancing devices advantageously enhance watershed runoff functionality in subsurface watershed conduits by altering watershed flow from a parabolic flow pattern to a rotational flow pattern while still accommodating fish passage requirements. This change in flow pattern beneficially provides turbulence that disrupts and flushes debris out of the subsurface watershed conduits. This disruption and flushing establishes a passive cleaning functionality within the subsurface watershed conduits that serves to clean the subsurface watershed conduits after suitable upstream water delivery event (e.g., heavy rain, controlled water release, etc.). In doing so, these fluid flow enhancing devices overcome one or more shortcomings associated with subsurface watershed conduits in a manner that overcomes drawbacks associated with conventional design and in-use considerations for such subsurface watershed conduits.