Levees

1

Provide flood protection to a significant percentage of the population in California

2

Levees

3

• Education and Outreach

• Forecasting and Planning

• Operations and Maintenance

• Path Forward

Education and Outreach

4

• Outreach always easier after event

• Special Flood Hazard Area/ dam inundation area noted on Title Reports

• Public assumes government has taken care of flood risk

• Make levee inspection reports public

Forecasting and Planning

5

• Levee systems can be monitored (reservoir releases/field inspections)

• Longer forecasts/flood based forecast operations

• Local agencies using DWR grants for emergency response plans

Operations and Maintenance

6

• During initial construction, maintenance costs often ignored

• Animal burrows and encroachments can undermine performance

• Environmental constraints can delay maintenance

Emergency Response for Levee Breaches

7

Emergency Response for Levee Breaches

8

• Cache Creek High Flows

• February 27, 2019

Emergency Response for Levee Breaches

9

• Cache Creek High Flows

• February 27, 2019

Emergency Response for Levee Breaches

10

• Cache Creek High Flows

• February 27, 2019

Emergency Response for Levee Breaches

11

• Cache Creek High Flows

• February 27, 2019

Emergency Response for Levee Breaches

12

• Cache Creek High Flows

• February 27, 2019

Emergency Response for Levee Breaches

13

• Cache Creek Historical High Flows

Year Flow (cfs) Stage (ft)

1983 33,000 83.75

1995 36,400 85.37

1998 34,600 84.39

2006 29,900 83.28

February 27, 2019 26,400 84.90

1957 Design Flow 30,000 -

Path Forward

14

• Educate public• notifying property owners when they are protected by a levee

• Provide more funding for levee maintenance

• Reduce environmental constraints• if public safety is at risk