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STAGE 2

Questions to consider

Map the HighWaterLine

Map your community to determine the potential impacts of climate change

“I am interested in working on maps that explore the areas around the 10 foot above sea level line. Looking at the obvious things, like ethnicity, age, income, number of people in household, language spoken. But also other things like the infrastructure and what area it services. Things like distance from transportation in case of evacuation, immigration status (are the coastal dwellers new or old New Yorkers), types of industry.”

What types of utility infrastructure do you see below the line that would be impact the health, safety and mobility in your community?

What type of neighborhood’s are in your community, different ethnic groups, age groups, and economic levels.

Where are the safety hubs or high ground facilities that your community can go to in a major flooding scenario?

Where do you live in relation to the line? How might it feel to live above the line? Below the line?

ACTION STEPS

Eve Mosher 12/4/2007 BLOG POST

1. Visualize where in your community the line would be most visible and logical.

ACTIONS

2. Identify recent flood or storm surge data, or investigate where riverbanks or lakeshore lines were historically.

• Visualize scientific research • Learn about the local topography • Measure distance along waterways

• Utilize maps to chart flood zones • Identify important infrastructure in flood zones

3. Determine the boundaries of the flood zones or sea level rise and chart the line where you will navigate public space.

Stage 2 invites participants to visualize climate science by mapping projected sea level rise or flood zones. This can be an empowering stage of the project. It is through this visual activity that participants can make it real in their own backyard.

4. Identify key impact sites such as water treatment plants, subways, train tracks, electrical power plants, and tributaries flowing down toward larger water bodies.

Eve’s STORY

You’ll need to understand some of the science behind climate change, and tidal flow. Sea level rise is measured in vertical distance. In a coastal zone, a rise of just a few inches can cause salt water to push inland, changing fresh water to brackish water (a mixture of fresh and salt water) in some locations, and changing brackish water to salt water, in a process known as saltwater intrusion. As the sea levels increase or weather patterns change, the potential for flooding is even greater. Each city and area near a waterway will be impacted differently in terms of the level of inundation depending on a community’s ground elevation; sea level is relative.

STORM SURGE VS STORM TIDE

In 2007, Eve Mosher used USGS Topographic maps of the region and transferred that data onto Community Walks to mark the path she would take to mark the line. communitywalk.com

Storm surge is an abnormal rise of water generated by a storm, over and above the predicted astronomical tide.

Storm tide is the water level rise during a storm due to the combination of storm surge and the astronomical tide.

• •

• •

It’s the change in the water level that is due to the presence of the storm Since storm surge is a difference between water levels, it does not have a reference level

Since storm tide is the combination of surge and tide, it does require a reference level A 15 ft. storm surge on top of a high tide that is 2 ft. above mean sea level produces a 17 ft. storm tide

Source: National Oceanic and Atmospheric Administration

Stage 2

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Stage 2

15

HighWaterLine ACTION GUIDE  

ecoartspace presents Eve Mosher's HighWaterLine ACTION GUIDE, the first in a series of ten art and ecology learning guides presenting replic...

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