Environmental Hazard: Population in 100 Year Flood Zone
Flooding is a major issue in the city and the floodplain is increasing as a result of increased development. In Harris county, the floodplain increased by 65 square miles between 1996 and 2007 (Blackburn, 2011). According to the Harris County Flood Control District (HCFCD), 65% of the area in Harris County that flooded during Tropical Storm Allison was outside of the mapped regulatory floodplain (Harris County Flood Control District, 2004).
Sustainability Benefit: The delineation of the 100-year floodplain is a good estimate to identify areas at risk of flooding.
Sustainability Issue: Increasing the amount of impervious paving in the city also increases the amount of stormwater runoff and hence exacerbates flooding.