1 Will Allen, EI| GHD Hail Damage To Your Infrastructure? Using Insurance to Offset Project Costs NC AWWA WEA Spring Symposium Agenda • Background • Weather event • Types of hail damage • Damage assessment • Working with insurance • Design and construction • Project outcome
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Hail Damage To Your Infrastructure? Using Insurance to ... · Damage Assessment • GHD performed a hail damage assessment • This was to provide backup incase of an insurance dispute.
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Will Allen, EI| GHD
Hail Damage To Your Infrastructure? Using Insurance to Offset Project CostsNC AWWA WEA Spring Symposium
Agenda
• Background
• Weather event
• Types of hail damage
• Damage assessment
• Working with insurance
• Design and construction
• Project outcome
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Background
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North Fork Water Treatment Plant
• 31 MGD permited
• 15-17 MGD average
• Direct filtration water treatment plant.
• Burnette reservoir constructed in 1954
• Current facility built in 1976
• Main water source for the Asheville.
• A total of 7 buildings at the plant
• Roofs were covered with single ply, clay tile, and metal
Source: Google Earth
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Weather Event
How Hail Forms in a Storm
• A hailstone is developed in layers.
• Layers consist of transparent and translucent layers. Usually 0.039 inch in thickness. Layers are developed by rate of freezing, thus position in cloud.
• Usually irregular shaped and clumped together.
• Hail develops by cycling vertically in the cloud.
• Hail falls when the weight of hail overcomes the updraft or the cloud loses energy.
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Hail Storm at North Fork
• On April 1, 2016 a strong line of thunder storms impacted the plant.
Threshold for damage is a level where the functional capacity of the roofing material is affected, but not to the level where the water shedding capacity is stopped or the anticipated life of the roofing materials is alternate/diminished.
What Does Hail Damage Do to Single Ply?
• Type of system at North Fork
• Most approaching 20 years old
• As a TPO roof ages plasticizers leak out and make it more brittle