Are cities really reducing disasters?

Rain, floods and green systems: Are cities really reducing disasters?

It is a thought process for understanding the distribution and effects of the problem of pluvial fluid and gastrointestinal (GI) systems in local communities. Found: Portland State University

Cities are growing, the area of ​​impervious skins is growing. In cities across the United States, roads, buildings, parking lots, sidewalks and highways increased by an average of 326,000 acres annually between 2012 and 2017.

When it rains, bad water collects on these surfaces or flows into ditches, sewers and water systems. However, heavy rainfall events can eliminate the city’s ability to carry sewage, resulting in the city’s floods. The introduction of gastrointestinal (GI) systems, such as bioswales with permeable surfaces, has provided towns with a new tool to take care of the river’s problem associated with rainfall. Cities like Portland, Phoenix and Atlanta have planned to implement GI to reduce the risk of leukemia.

New research from Portland State University will combine demographic data with the distribution of GI and specific locations related to rainwater runoff in Portland, Phoenix and Atlanta and ask if it is building properly. these cities to the GI to reduce sea problems.

The paper, “The problem of urban water and green systems: Who sees the problem and who benefits from the investment? Landscape and urban planning.

According to the paper’s lead author, Arun Pallathadka, a Ph.D. students at the Earth, Environment and Society program at Portland State, the research team found that the deposits of GI in each of the cities inconsistently overlapped with areas prone to rainwater runoff, and non- white and low-income populations are more vulnerable to influx. trouble. Portland and Phoenix have increased investments in the GI in communities with large non -white residents and low income, signaling a shift to a more sustainable economy. In Atlanta, the risk of flooding is very low for non -white people and low income, even though the amount of GI coverage varies.

“Flooding is a real natural disaster,” Pallathadka said. “But when we talk about the flow, the idea is often to be on the river, in the streams. But with the changing climate, we think of climbing the risk of flooding, who live in those communities, and where are the cities located to help reduce the risk of flooding? Dealing with disasters. “

In addition to looking at spatial, temporal and demographic analysis, the research team, including Heejun Chang, professor of geography at Portland State, and Jason Sauer and Nancy Grimm of the University of California, has developed Arizona State, has developed a tool that can be used by researchers, urban planners. and policy makers to isolate the problem levels of the community. Cities can use the app to help guide GI donations to communities most vulnerable to flooding from rainfall events. It is a thought process for understanding the distribution and effects of the problem of pluvial fluid and gastrointestinal (GI) systems in local communities.

The activities organized by the organization provide cities with a new way to evaluate the effectiveness of the GI in communities in relation to rainwater runoff and planning for distribution. balance such resources as they move forward under the threat of increasing the number of rain events associated with it. a warm world.

Exercise: Low -lying communities are more susceptible to running, very hot water

More information:
Arun Pallathadka et al, The river crisis and green systems: Who knows the problem and who will benefit from the investment? A study of three U.S. cities, Landscape and urban planning (2022). DOI: 10.1016 / j.landurbplan.2022.104417

Presented by Portland State University

Directions: Yes, floods and green systems: Are cities really reducing disasters? (2022, April 15) Retrieved 15 April 2022 from

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