Riverine Flood Risk in Delaware
All Delaware counties ranked by FEMA National Risk Index riverine flood score
Riverine Flood risk — rivers and streams overflowing their banks after heavy rain or snowmelt — is rated for 3 of 3 Delaware counties in FEMA's National Risk Index. New Castle County carries the state's highest riverine flood score at 97.6, with $150M in expected annual riverine flood losses.
1 Delaware county is rated High or Very High for riverine flood, and expected annual losses from riverine flood total roughly $217M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Riverine Flood
| # | County | Riverine Flood Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | New Castle County | High | 6.57 / yr | $150M | |
| 2 | Sussex County | Medium | 2.54 / yr | $43M | |
| 3 | Kent County | Medium | 1.39 / yr | $24M |
3 Delaware counties with measurable riverine flood risk. See the national riverine flood ranking or all Delaware counties by overall risk.
Frequently Asked Questions
Which Delaware county has the highest riverine flood risk?
New Castle County has the highest FEMA riverine flood risk score in Delaware at 97.6 (High), with $150M in expected annual losses and about 6.57 events per year.
How many Delaware counties face significant riverine flood risk?
3 Delaware counties record measurable riverine flood risk in FEMA's National Risk Index; 1 of them are rated High or Very High.