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Water issues
Flooding
- 27 significant floods have been reported since 1862
- Over $542 million in flood damage since 1960
- Voters approved Measure A, a flood protection sales tax in March 1998
- Napa River/Napa Creek Flood Protection Project, currently under way, aims to protect against 100-year floods on both streams while following the Living River Guidelines
Water supply for people
- in cities, meeting current demands requires the combination of reservoir storage & imports from State Water Project
- unincorporated area demands met by combination of surface and groundwater
- projections through 2050 show increasing shortfalls during dry periods, especially in unincorporated areas
- depletion of groundwater a rising concern
- surface water diversions may conflict with fish needs
- recycled water use is increasing
Fish habitat
- low springtime creek flows may inhibit fish passage & keep fish from thriving
- timing of surface water diversions for human use is important for fish
- increased & concentrated surface runoff destroys fish habitat
Groundwater
- sparse long-term monitoring by state Department of Water Resources
- identified groundwater basins include Napa Valley main basin, Milliken-Sarco-Tulucay basin, and Carneros basin
- human use is primarily for irrigation and rural residential wells
- recharge of groundwater not keeping up with human use
- groundwater levels especially threatened in Milliken-Sarco-Tulucay
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