Citation

Sohn W, Brody SD, Kim JH, Li MH. Cities 2020; 107: e102917.

Copyright

(Copyright © 2020, Elsevier Publishing)

DOI

10.1016/j.cities.2020.102917

PMID

unavailable

Abstract

The impacts of flooding can be devastating. Huge financial burden often follows major storm events to recover from structural damage. Well-designed drainage systems allow for effective discharge of stormwater, reducing property losses and expenditures on recovery. However, a lack of empirical studies on the topic has impeded the determination of which drainage method might be the most effective in preventing or minimizing property losses from flooding. This study assessed the economic impacts of three drainage systems − storage-, conveyance-, and infiltration-based facilities - on reducing flood damage recorded from 2009 to 2012 by Federal Emergency Management Agency in the Buffalo Bayou watershed in Houston, Texas, USA. Ordinary least squares and spatial autoregressive models were developed with a group of variables featuring drainage system, housing structure, geophysical environment, and storm characteristics. The results show that storage-based systems outperform conveyance-based mechanisms. Infiltration-based facilities are found to be less effective in reducing property damage because green spaces disconnected from sewer systems are rapidly inundated after being saturated while excessive overflow is not properly drained. This study confirms that the performance of a drainage system varies by facility type and environmental setting. The results encourage the recovery of wetlands and integration of retention/detention basins into community development in flood-prone areas to prevent potential future economic losses.

Language: en

Keywords

Economic impact; Flood insurance; Flood recovery; Green infrastructure; Stormwater management; Structural flood control measure