Box Gutter Overflow Device with Dual Sump Receptacles
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Solution Overview
Problem
Existing overflow devices for box gutters often fail to comply with stormwater drainage codes, particularly AS/NZS 3500.3, due to complex construction and inadequate hydraulic capacity, leading to potential damage from blocked downpipes.
Innovation Solution
A simpler overflow device design featuring a primary and secondary sump receptacle with a partitioned chamber system, allowing water to overflow from the primary to the secondary receptacle, ensuring adequate hydraulic capacity and compliance with stormwater drainage codes by accommodating rainfall intensities for a 100-year average recurrence interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sump with side overflow device or high-capacity overflow device is used, then the hydraulic capacity can accommodate blocked downpipe conditions, but the device complexity and construction requirements increase
Solution Approach 1:
The sump is divided into two separate receptacles (first and second receptacles) with distinct outlet ports. Each receptacle handles specific flow conditions independently, allowing the system to maintain hydraulic capacity for blocked downpipe conditions while simplifying the overall construction by using separate, modular components rather than a complex integrated system.
2Reliability
If the common wall upper edge is spaced below the upper edges of end walls and sidewalls, then water can overflow from primary to secondary receptacle, but the device height increases
Solution Approach 1:
The overflow path is arranged horizontally between the two receptacles at different lateral positions, with the common wall positioned to allow overflow from the first to the second receptacle. This horizontal arrangement in plan view, rather than vertical stacking, enables the overflow functionality while controlling the overall device height by utilizing lateral space instead.
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 provides a compliant and efficient overflow solution that maintains the hydraulic capacity during both normal and overflow conditions, preventing damage from blocked downpipes and simplifying installation and design processes.
Implementation Method 1
water is able to flow from the first section of the box gutter, over an upper edge of the first end wall of the primary receptacle, into the primary receptacle for discharge through the primary outlet port
Implementation Method 2
when discharge through the primary outlet port is sufficiently blocked, water is able to overflow an upper edge of the common wall to be received into the secondary receptacle and discharged through the secondary outlet port
Data Source
AI summary
An overflow device comprising a sump for a box gutter includes a primary sump receptacle with first and second end walls, a pair of sidewalls extending between and a basal wall, with a primary outlet port for the discharge of water; the second end walls is common in forming a first end wall of a second sump receptacle having a second end wall, opposed sidewalls, a bottom wall and a secondary outlet for the discharge of water. The common wall has an upper edge spaced below the upper edges of each of the first end wall of the primary receptacle, the second end wall of the secondary receptacle and of the opposed sidewalls of each receptacle. The overflow device has a width between at least equal to the width of the box gutter whereby the overflow device is adapted to be installed in relation to a first box gutter section such that:the first end wall of the first sump receptacle extends transversely with respect to the box gutter to enable the overflow device to be sealed to the first section of the box gutter,the overflow device is adapted to be installed, if required, in relation to a second section of the box gutter such that the second end wall extends transversely with respect to the box gutter for sealing the overflow device to the second section of the box gutter; andsuch that, with the overflow device so installed, water can flow from the first section of the box gutter, over an upper edge of the first end wall of the primary receptacle, into the primary receptacle and discharge through the primary outlet port, and with the primary outlet port sufficiently blocked, water can overflow an upper edge of the common wall, into the secondary receptacle and through the secondary outlet port.