SLIDE 1
BASIC DEMOGRAPHICS
Land area is 7 square miles Permanent population ~ 88,000 Average daily population ~ 182,000 Annual beach patrons 16 million Highly urban Housing units per sq. mile 9,300 Taxable property value $23 billion
MIAMIBEACH BASIC DEMOGRAPHICS Land area is 7 square miles Permanent - - PowerPoint PPT Presentation
MIAMIBEACH BASIC DEMOGRAPHICS Land area is 7 square miles Permanent - - PowerPoint PPT Presentation
MIAMI BEACH MIAMIBEACH BASIC DEMOGRAPHICS Land area is 7 square miles Permanent population ~ 88,000 Average daily population ~ 182,000 Annual beach patrons 16 million Highly urban Housing units per sq. mile 9,300 Taxable property value $23
SLIDE 2
SLIDE 3
TOPOGRAPHIC DATA
Low and relatively flat terrain
- Coastal dune
- Mangrove swamp
- Manmade islands
High imperviousness
- Existing Development
- New Construction
Tidal constraints High groundwater table Aging infrastructure in corrosive conditions
SLIDE 4
STORMWATER MANAGEMENT MASTER PLAN
SLIDE 5
STORMWATER BASICS
When the sea level rises: Water flows more slowly or even flows from the Bay to the streets Storm water flows to catch basins Through large pipes Outfalls into Biscayne Bay
SLIDE 6
STORMWATER MANAGEMENT MASTER PLAN
The previous City Stormwater Management Master Plan was developed in 1997. Old Plan determined needs by:
- water quality
- flooding potential
- citizen complaints
- City staff ranking
New Plan determined needs by:
- City-wide model analysis
- water quality
- incorporates sea-level rise
projections
SLIDE 7
RAINFALL INUNDATION MAPPING
6 inch rainfall event flooding with tidal elevation of 0.5 ft NAVD up from -0.9 ft NAVD normal tide condition
MIAMIBEACH
SLIDE 8
TWO SEA LEVEL RELATED QUESTIONS
What is the present sea level? How fast is it rising?
MIAMIBEACH
SLIDE 9
STORMWATER MANAGEMENT MASTER PLAN
0.51 0.67 0.84 0.16 0.36 0.29 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025 2030 Mean High Water (ft NAVD) Year USACE NRC Curve I (Low) USACE NRC Curve II (Intermediate) USACE NRC Curve III (High) Virginia Key Tidal Data
NOAA ¡Epoch ¡ Annualized ¡Virginia ¡Key ¡ ¡ NOAA ¡ ¡Data ¡(1996-‑2011) ¡ USACE curves are based on the Engineering Circular EC 1165-2-212, published on October 1, 2011 and expires September 30, 2013.
SLIDE 10
STORMWATER MANAGEMENT MASTER PLAN
SLIDE 11
GOING FORWARD
Add flexibility to stormwater system
- backflow preventers at outfalls
- stormwater pump stations
- future storage
- raise seawalls
Monitor change in sea level and refine future adaptation strategies Re-prioritize infrastructure requirements, as needed Gain community acceptance Develop long-term financing
SLIDE 12
MIAMI BEACH IN 20 YEARS AND BEYOND
After over $200 million in stormwater infrastructure investment
- Improved drainage system
- Adaptable system
- City more resilient
Future policy considerations
- Seawalls
- Surge protection
- City climate action plan
SLIDE 13