www.broward.org/climatechange climate change and water resources presentation to the west palm beach...

www.broward.org/climatechange

Climate Change and Water Resources

Presentation to the West Palm Beach Green Task ForceMay 6, 2010

Nancy J. Gassman, Ph.D.Natural Resources Administrator

Broward County Environmental Protection and Growth Management Department


Our past...

100 years ago Clematis Avenue looked like this.


looked different than our present...

Clematis Avenue today


and our future.

West Palm Beach in 2100?

Planning today shapes our tomorrow.


Looking Forward• Climate Change and its impacts will be a

dominant agent of change in SE Florida.

• Action including careful coordinated planning is needed to sustain our economy and to ensure a climate-resilient SE FL community.

• Adaptation to water resource issues are central to sustainability…and are already being impacted.


a) Drinking water

a) Demand

b) Availability of existing and future water supply

c) Treatment requirements

b) Predictability of Rainfall/Storm events

c) Drainage

d) Utility carbon footprint

Critical Water Resource Concerns


Development, even in high risk areas, is expected to continue


Sea Level Rise Implications

• Saltwater intrusion into the

aquifer

• Drainage and flood control compromised


a) Drinking water

a) Demand

b) Availability of existing and future water supply

c) Treatment requirements

b) Predictability of Rainfall/Storm events

c) Drainage

d) Utility carbon footprint

Critical Water Resource Concerns


Extreme Weather

(12/17-19/09)8-16 inches rainfall


Extreme Rain Event Hollywood/Hallandale

Photo: Sun Sentinel

(12/17-19/09) 8-16 inches rainfall


Tropical cyclones and climate changeTropical cyclones and climate change

• Hurricane Intensity ↑Hurricane Intensity ↑• Storm Frequency ↓Storm Frequency ↓• Storm-related Rainfall ↑Storm-related Rainfall ↑

•http://geology.com/hurricanes/named-hurricane-fran.gif


Tidal Flooding 9/18/09 – Las Olas(8 inches above average high tide)


Tidal Flooding 9/18/09 – Riverwalk(8 inches above average high tide)


Drainage in the Face of Sea Level Rise


StormwaterSaltwater

Flood Control

Structure

Drainage Challenge with Sea Level Rise

Drainage Capacity

CURRENT CONDITION

StormwaterSaltwater

Flood Control

Structure

Drainage Capacity

FUTURE CONDITION


Defining Adaptation

Preparing for climate change impacts that are inevitable.


Broward County Climate Change Action Plan

WATER RESOURCES

Goal 1Ensure protection of water resources while

minimizing flood damage

Action 1.1 Include climate change in updates of

Lower East Coast Plan

Action 1.2 Conduct studies for large-scale Advanced Water and

Wastewater Treatment Plants

Action 1.3 Monitor and protect wellfields

Action 1.4 Re-evaluate reuse due to sea level rise


Climate Change Action PlanWater Resources



WATER RESOURCESGoal 1 (cont)

Action 1.5 Development, by utilities, of adaptive management

strategies for water resources

Action 1.6 Reduce utility carbon footprint

Action 1.7 Provide resources to implement water conservation

Action 1.8 Develop alternative water supply strategies


Water Resources



WATER RESOURCESGoal 1 (cont)

Action 1.9 Protect Wastewater Treatment System from

Infiltration and Inflow

Action 1.10Convene a regional workshop to enhance resilience of

water resources to Climate Change

Action 1.11 Require construction to include a percentage of

pervious areas to enhance water resources



MODELING, MONITORING, AND MAPPING

Goal 8Ensure the use of current modeling information in developing adaptation and mitigation strategies

Goal 9Develop and maintain monitoring for environmental benchmarks that indicate impacts of climate change

Goal 10Ensure the use of current mapping information in developing adaptation and mitigation strategies



MODELING, MONITORING, AND MAPPING

Goal 10Ensure the use of current mapping information in developing adaptation and mitigation strategies

Action 10.1 Improve inundation mapping capabilities

Action 10.2 Develop new 100 year storm maps

Action 10.3 Incorporate sea level rise/storm surge impacts into

maps of hazard areas

Action 10.4 Encourage FEMA to consider Sea Level Rise in flood

map updates


1 ft rise

0 84

Miles

At Risk in Broward:

1934 households

182 business

Property worth ~ $469M

Critical Infrastructure: Library/park/natural area

4 major roads including:Hollywood Blvd

Ocean Dr / A1ADania Beach Blvd

Sheridan St

Sea level rise is based on additional water above themean higher-high water (MHHW) value. MHHW isdefined as the average of the higher high water heightof each tidal day. MHHW was calculated from tidalstation data along the coast of Broward County duringthe 1983-2001 epoch and represents approximately 6inches of elevation on the LiDAR. This value wasprovided by NOAA Tide and Currents.

LiDAR point elevation error: +/- 0.21 feet (2.52 inches)LiDAR flown: 2007 - 2008H: North American Datum 1983 HARN FeetV: North American Vertical Datum 1988 (NAVD88) Feet

LiDAR point elevations provided by:Florida Division of Emergency Management

Area at Risk

LEGEND

General area directly affected by tides

Broward County Salinity Control Structures#


a) Future water supply source planning

b) Future water supply treatment planning

c) Contingency planning for extreme drought and rainfall

d) Coordinated retrofit of drainage infrastructure

b) Investigation into reducing utility carbon footprint

Municipal Considerations

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