Paving Element Drainage Channels for Filter Media Maintenance
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Solution Overview
Problem
Existing paving systems with drainage cavities and filter media face challenges in maintaining infiltration capacity due to clogging with organic and chemical particulates, and conventional cleaning methods are ineffective in restoring this capacity, leading to reduced water treatment effectiveness over time.
Innovation Solution
The design of paving elements with partial drainage cavities that can be efficiently cleaned using a pressurized fluid jet and vacuum system, allowing for the removal and replacement of spent filter media, thereby maintaining the infiltration capacity of the pavement system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter media is provided within drainage cavities to filter contaminants, then water treatment effectiveness is improved, but infiltration capacity decreases over time due to clogging with organic and chemical particulates
Solution Approach 1:
The drainage cavity is segmented into an upper cupule portion and a lower conduit portion. The filter media is confined to the upper cupule portion, while the lower conduit portion remains clear for efficient water flow. This segmentation allows the system to maintain both filtration capability and high infiltration capacity by preventing clogging in the conduit portion.
2Ease of operation
If conventional cleaning methods are used on drainage cavities, then maintenance is simplified, but infiltration capacity cannot be substantially restored
Solution Approach 1:
Instead of trying to clean the entire drainage cavity including the conduit portion, the design inverts the approach by confining filter media to only the upper cupule portion. This allows conventional surface cleaning methods to effectively maintain the system by removing debris from the accessible upper portion, while the lower conduit portion remains inherently resistant to clogging.
3Productivity
If filling material is provided in drainage recesses to enable drainage, then water discharge capability is improved, but removal of spent filter media becomes difficult
Solution Approach 1:
The drainage cavity is divided into an upper cupule portion that receives and contains the filter media, and a lower conduit portion that provides unobstructed water flow. This segmentation allows the filter media to be easily accessed and removed from the upper portion without interfering with the water discharge function of the lower conduit portion.
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
This solution enables the effective removal and replacement of spent filter media, restoring the infiltration capacity of the pavement system, ensuring continued effective water treatment and pollutant filtration over time.
Implementation Method 1
The cleaning apparatus may include a jet configured to direct a stream of pressurized fluid towards the filled drainage cavities
Implementation Method 2
The cleaning apparatus may include a vacuum configured to facilitate the removal and collection of the spent filter media
Data Source
Figure 1
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Figure 4
AI summary
A paving element includes upper and lower surfaces and one or more drainage channels extending through the paving element between the upper and lower surfaces. The drainage channels include a substantially concave or cupule shaped upper portion, provided on the upper surface of the paving element, and a channel from the concave portion through to the lower surface of the bottom surface of the paving element. The drainage channels can be complete, when provided in the interior of the paving element, or partial, when provided along the sides or perimeter of the paving element. The partial channels are completed when the paving element is placed adjacent another paving element when forming a pavement. The drainage channels are adapted to facilitate the cleaning process of the channels.