Gallinas Watershed Program

Transcription

1 S A N R A F A E L C I T Y C O U N C I L May 2, 2016

2 Tonight s Agenda G A L L I N A S W A T E R S H E D P R O G R A M What is the Watershed Program? Gallinas Watershed Products Community Involvement More Information Questions and Answers Slide 2

3 The Watershed Approach H O L I S T I C ; L O O K I N G A T T H E E N T I R E S Y S T E M Encourages collaboration across jurisdictions Combines flood protection and habitat restoration elements Supports cost-effective solutions Attractive to state and federal regulatory and funding agencies Stakeholder-driven and community-based Slide 3

4 Gallinas Watershed C I T Y A N D U N I N C O R P O R A T E D - W A T E R K N O W S N O B O U N D A R I E S Slide 4

5 Watershed Goals I N T E G R A T E F L O O D P R O T E C T I O N A N D E N V I R O N M E N T A L R E S T O R A T I O N Reduce flood risk to vulnerable communities Evaluate local, beneficial re-use of sediment Improve navigational access Plan for sea level rise Identify multi-benefit projects for grant funding Protect and restore creek and wetland habitats Slide 5

6 Program Partners C O L L A B O R A T I O N City of San Rafael Flood Control Zone No. 6 Flood Control Zone No. 7 County Service Area No. 6 Las Gallinas Valley Sanitary District Marin County DPW and Parks Slide 6

7 Products Slide 7

8 Sea Level Rise Vulnerability Assessment L O W E R G A L L I N A S C R E E K B E L O W 2 0 FT E L E V A T I O N Existing Conditions and 3 Sea Level Rise scenarios Slide 8

9 Sea Level Rise Vulnerability Assessment L O W E R G A L L I N A S C R E E K B E L O W 2 0 FT E L E V A T I O N Current 12" SLR 36" SLR 60" SLR Structure Type Total # % # % # % # % Residential 3, % 1,110 31% 1,531 43% 1,733 49% Industrial/Commercial % % % % Institutional/Other % 10 6% 12 7% 18 11% Total 4, % 1,234 31% 1,662 41% 1,901 47% Mean higher high water at 6.2 ft NAVD88 *Mean higher high water at 6.2 ft NAVD88 Impacted Current 12" SLR 36" SLR 60" SLR Streets (miles) Total # % # % # % # % City San Rafael % % % % County % % % % State/Federal % % % % Private Roads % % % % Railroad % % % % Total % % % % Slide 9

10 Upper Gallinas Restoration Opportunities R E S T O R I N G T H E C O N C R E T E C H A N N E L I N T E R R A L I N D A Concrete channel is nearing the end of its design life Can we restore the channel and add a greenbelt to enhance habitat and people s interaction with the creek? Slide 10

11 Upper Gallinas Restoration Opportunities R E S T O R I N G T H E C O N C R E T E C H A N N E L Alternate A Restore in Place Alternate B Restore with Greenway and High-Flow Bypass Alternate C Full Restoration with Enhanced Greenway Las Pavadas to Las Gallinas Ave. Slide 11

12 Community Involvement S U M M A R Y O F P U B L I C M E E T I N G S A N D O P P O R T U N I T I E S F O R F E E D B A C K Updates at public Flood Control Zone and County Service Area meetings Updates to SVNA, GWC and HOAs E-newsletters and notifications Post all reports to website; invite public comments January 2014 Levee Evaluation Community Meeting April 2016 Watershed Program Community Meeting Slide 12

13 What Have We Learned? P R O M O T I N G M U L T I P L E B E N E F I T S - W A T E R, F L O O D R I S K R E D U C T I O N, E C O L O G I C A L Santa Venetia McInnis Marsh Upper Gallinas Creek Levees Pump Stations Street drainage Habitat Restoration Recreation Sea Level Rise Restoration Sediment management Sediment re-use Slide 13

14 Potential Options G A L L I N A S W A T E R S H E D M E A S U R E S Phased restoration of concrete channel Improve recreation and navigation Use dredge spoils to raise McInnis Marsh elevations Improve habitat and water quality Tidal flood protection Santa Venetia flood protection improvements Adapt to sea level rise Slide 14

15 Moving Forward C O N T I N U I N G T H E W A T E R S H E D A P P R O A C H Strengthening partnerships Bringing in additional stakeholders Identifying multi-benefit projects Attracting grant funding Leveraging local funding Slide 15

16 For More Information W E B S I T E A N D N O T I F I C A T I O N L I S T webpage creek_flood_protection.html BayWAVE / Sea Level Rise notification list Contact me: lwilliams@marincounty.org Slide 16

17 Thank You Laurie Williams Senior Watershed Planner /gallinas_creek_flood_protection.html May 2, 2016