1. 1 FEMA Flood Insurance Rate Map Update FEMA Public Meeting October 22, 2009

2. FEMA Initiates Levee Reaccreditation Every 5 Years Heritage Levee (City) Pole Crk Debris Basin (WPD) Pole Crk Channel (WPD)

3. Accredited: Non Accredited: Heritage Levee (City) Pole Crk Debris Basin (WPD) Non accredited levees cause Flood Zone A Levees Expected to be Accredited by November 2009 Pole Crk Channel (wpd)

5. Accredited: Non Accredited: Years to Accreditation Future Heritage Levee (City) 3 to 10 1 to 6 Pole Crk Debris Basin (WPD) Pole Crk Channel (WPD) 4 to10 6 to 12

6. HISTORY OF SESPE CREEK LEVEE  1978: Los Serenos Flood  1979: Q-100 = 98,000 CFS  1983: COE Sespe Levee - 121,000 CFS  1979 to 2009: 6 Large Flood Flows  2006: Q-100 = 135,000 CFS

7. T E C H N I C A L S T U D I E S Los Serenos 1978 Flood (pre-levee) 7

8. Improved Hydraulic Analysis Since 1979  1979: HEC 2 – One Dimensional Flow Analysis  2009: HEC RAS + Flow 2 D – Two Dimensional Flow Analysis  Better projection of flow from island crossover

9. Main Channel Shifts from West to East (1938 – 2008) 193819752005 9 T E C H N I C A L S T U D I E S

10. Scour and Aggradation T E C H N I C A L S T U D I E S 10 (1970s, 2004, & 2005 topography)

11. SC-1 Levee - Phase 3 Certification Action Plan Cost Estimate: $824,500

12.  Raise levee 1 to 6 feet  Preliminary initial cost $6,500,000  Deepen Foundation?+3X$ A L T E R N A T I V E S A N A L Y S I S 12 Preliminary Plan Retrofit the USACE Levee 6’ 1’

13. A L T E R N A T I V E S A N A L Y S I S Possible Modification/Replacement of Hwy 126 Bridge  Extension/replacement of exist. structure  Options: 90’ extension; Raise existing structure  Cost: $13,000,000 or or$44,000,000  Possibly Non effective

14. T E C H N I C A L S T U D I E S Summary of Key Sespe Issues  Increase in estimated peak flow rates based on additional stream gage data (+35% compared to 1979 analysis)  Shift of dominant channel from west to east fork  Active channel changes with major storm events  Lower reach of USACE levee does not meet Federal requirements  Long-term sediment deposition and local erosion  Levee foundation must be checked for adequacy for the new 100 year flow 14

15. T E C H N I C A L S T U D I E S Next Steps on Sespe Creek Levee  Ventura County Watershed Protection District reaches consensus with FEMA and Army Corps of Engineers on the retrofit work necessary to restore Q-100 capacity.  Prepare Environmental Impact Report, Plans and Specifications.  Locate funds and construct improvements.  Obtain Letter of Map Revision from FEMA which removes Flood Zone “A” and requirements for flood insurance.  Accreditation: 3 to 10 years ALL CONCEPTS AND COSTS PRESENTED TONIGHT ARE PRELIMINARY AND SUBJECT TO SIGNIFICANT CHANGE 15

16. Heritage Levee (City) Heritage Levee Issues  LOMR going to FEMA this month: October 2009.  If approved by FEMA, Heritage area could be removed from Flood Zone “A” as early as Spring 2010.  Accreditation: 6 months to 6 years

17. Pole Crk Debris Basin (WPD) Pole Creek Debris Basin Issues  Construction of permanent basin on hold until Heritage Bridges project moves forward.  Once approved by FEMA El Dorado should be removed from Flood Zone “A”  Accreditation: 4 to 10 years

18. Pole Creek Channel Issues Pole Crk Channel (wpd)  VCWPD is planning to increase capacity from Q-50 to Q-100.  Schedule and funding for this work is uncertain due to issues over Steelhead Trout passage.  Accreditation: 5 to 15 years  Next FEMA map update (2012) may put some homes in east Fillmore into Flood Zone “A” until channel improvements are complete.

19. Accredited: Non Accredited: Heritage Levee (City) Pole Crk Debris Basin (WPD) QUESTIONS ? Pole Crk Channel (wpd)

22. Levee Certification Website http://www.vcwatershed.org/levee