# Urban Flood Control (DD-369)

> Urban flooding happens when heavy rain overwhelms a city's drainage. Impermeable surfaces such as concrete, asphalt and rooftops keep water from soaking into the soil, so runoff rushes into storm drains faster than they can carry it. Cities respond with larger drains, retention basins, permeable pavement and green spaces. The footage shows floodwater surging through city streets.

- Department: Tech (also Nature)
- First published: 2024-11-13
- Last updated: 2024-11-13
- Permalink: https://detailenjoyer.com/case/urban-flood-control/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## Quick facts

- **DD-369-F01**: Rain overwhelms drainage. _(Write-up · Exhibit A (Cause))_
- **DD-369-F02**: Concrete and asphalt are impermeable. _(Write-up · Exhibit B (Surfaces))_

## Write-up

Concrete and asphalt stop rain from soaking into the ground. Storm drains can overflow when too much water arrives at once.

1. **Cause**: Rain overwhelms drainage.
2. **Surfaces**: Concrete and asphalt are impermeable.
3. **Runoff**: Water runs off quickly.
4. **Drains**: Drains overflow.
5. **Solutions**: Permeable pavement and basins.

## Related case files

- [Retarred Roads (DD-494)](https://detailenjoyer.com/case/retarred-roads/): I linked more on city roads

## Reel vs. record

- **Note**: None needed.

## Video: Urban Flood Control: Concrete and Asphalt Stop Rain From Soaking Into the Ground

- Duration: 24.4 s · Published: 2024-11-13
- File: https://detailenjoyer.com/assets/videos/DCTKAl8u8Iz.mp4

### Transcript

Urban flooding occurs when heavy rainfall overwhelms drainage systems in cities, causing water to accumulate on streets, sidewalks, and properties. This flooding [...] exacerbated by [...] proportion of impermeable surfaces in urban areas, such as concrete, asphalt, and rooftops which prevent water from naturally seeping into the ground. As a result, water flows rapidly into storm drains which may [...] the capacity to handle such large volumes, leading to overflow. NOW YOU KNOW!

## Questions & answers

**Q: What overwhelms drains?**  
A: Volume. _(Source: Write-up · Exhibit A (Cause) · Wikipedia: Urban flooding)_

**Q: Which surface is impermeable?**  
A: Sealed. _(Source: Write-up · Exhibit B (Surfaces) · Wikipedia: Urban flooding)_

**Q: What is water running off land called?**  
A: Overland. _(Source: Write-up · Exhibit C (Runoff) · Wikipedia: Surface runoff)_

**Q: What helps?**  
A: Soaks in. _(Source: Write-up · Exhibit D (Drains) · Wikipedia: Urban flooding)_

**Q: Where does runoff go?**  
A: Drainage. _(Source: Write-up · Exhibit E (Solutions) · Wikipedia: Urban flooding)_

## Sources

- [Wikipedia: Urban flooding](https://en.wikipedia.org/wiki/Urban_flooding)
- [Wikipedia: Surface runoff](https://en.wikipedia.org/wiki/Surface_runoff)

## Cite this case file

Easterling, Marcus. "Urban Flood Control." The Detail Department (DetailEnjoyer), case file DD-369, last updated Nov 13, 2024. https://detailenjoyer.com/case/urban-flood-control/