Drainage Basins

The Drainage Basin Master Plan, approved by City Council in June 2004, describes the flooding history of each basin, identifies potential problem areas and recommends improvements. In addition, the master plan:

• Recommends cost-effective projects to remove properties from floodplains, reduce risk and reduce street flooding
• Offers guidance for new development in the basins
• Provides ways to enhance the riparian habitat along stream corridors and improve water quality
• Offers guidance to stabilize streams where necessary

History
The City updated the master plan and floodplain maps after the devastating 1997 flood, including criteria for a "100-year storm". During the update process, officials determined approximately 2,745 structures and numerous roads would be damaged during a 100-year storm. Total estimated cost of damage: $139.6 million.

Stormwater Improvement Projects
Numerous improvements were recommended in the plan. Construction of all improvements is expected to occur by 2036. The result: more than 2,300 structures removed from the 100-year floodplain flood damages reduced by more than $289 million