Most urban infrastructure was not designed for shorter duration storms that yield torrential downpours. Hard surfaces including roofs cause stormwater to pool rapidly, creating floods. Green roofs can mitigate some of this effect, and a similar approach known as “blue roofs” can accomplish the same without using vegetation.
A blue roof system stores rainwater and slowly releases it using flow-control devices or structures including customized trays and existing building risers that cause water to dam up. Together, they collect and then slowly release rainwater, allowing municipal drains and stormwater piping to keep up with heavy volume pressure.
Blue roofs typically retain more water than green roofs and are particularly beneficial in commercial/industrial zones. Stored water also provides buildings with a cooling effect through evaporation, and the collected water can be made available for reuse.
Related Stories
Codes and Standards | Oct 26, 2021
Drownings during Hurricane Ida point out FEMA flood map flaws
Eleven people drowned in New York City in areas marked as low risk.
Codes and Standards | Oct 26, 2021
Dept. of Energy’s REScheck tool updated for the 2021 International Energy Conservation Code
Previous version incorporated 2018 code.
Codes and Standards | Oct 20, 2021
New York City passes overhaul of construction codes
Over 600 major changes along with thousands of smaller updates slated for 2022.
Codes and Standards | Oct 20, 2021
One-quarter of U.S. critical infrastructure at risk of failure due to flooding
Police and fire stations, hospitals, airports, and wastewater treatment facilities face threat.
Codes and Standards | Oct 19, 2021
Pittsburgh enacts first-in-the-nation “Dark Sky Lighting” law
Applies to all city parks, facilities, and streetlights.
Codes and Standards | Oct 15, 2021
New Calif. law mandates use of lead-free plumbing fixtures
Must meet NSF/ANSI/CAN 61-2020 in 2023.
Codes and Standards | Oct 14, 2021
Building industry leaders urge governments to boost emissions reductions targets
Scores of large AEC firms and organizations sign letter to UN’s COP 26 group.
Codes and Standards | Oct 13, 2021
FEMA’s new flood insurance plan will sharply raise insurance costs for seaside properties
Risk Rating 2.0 will have more accurate assessment of flood risk.
Codes and Standards | Oct 12, 2021
Three new laws expected to spur more affordable housing in California
Trio of measures could aid carbon reduction in built environment.
Codes and Standards | Oct 11, 2021
New program to promote mass timber construction launched in Boston
City’s planning and development agency to award grants for projects in early-stage planning.
