Surge Protection for Charleston?June 2020 - Jared Bramblett
The comment period on the US Army Corps of Engineers Coastal Flood Risk Management Study (surge protection wall) ends this Friday (06/19/2020). All comments submitted prior to the deadline will be incorporated into the project documentation and addressed by the Corps. I encourage you to read the report and consider submitting comments. It is important that comments are submited by Friday so that we can hopefully influence the outcome of this project. Note that the comment application limits comments to 1000 characters. If your comments are longer, you can submit them as multiple comments or email them to email@example.com.
I created the visualization studies below for the Historic Charleston Foundation to develop a point of reference and scale for the proposed wall’s impacts around Peninsular Charleston.This is a significant project that is going to impact how we live on the peninsula and interact with our environment. Ultimately, I believe we do need some form of perimeter protection. However, we need to carefully look at this project and how it interacts with our natural and man-made systems holistically. The City's estimated financial obligation is significant, so the project is likely to affect many aspects of City government. We need to ensure that the City will be able to continue to provide services and implement other improvements (storm drainage, parks, etc.) to improve quality of life for the City's residents. Climate change and sea level rise are going to present enormous challenges moving forward, and we need to look at innovative ways to mitigate their impacts.
There’s a lot to dive into in the report. Here are important points that I think should be considered:
- It is paramount that the project protect the area from tidal flooding events (’King Tides’ or ‘sunny day flooding) associated with sea level rise.
- The alignment and height of the protection should be carefully analyzed and considered. Is protection to 12-feet appropriate, or should we look at different elevations? Should the wall be placed within existing high ground, or should it be in the marshes and rivers that surround the peninsula?
- The project should be investigated in a holistic way that aims to make us resilient to future challenges associated with climate change and sea level rise. A robust system that has multiple protections from single points of failure is essential.
- The project should have multiple uses and benefits. Recreation facilities should be incorporated into the permitier protecton wherever feasible. The current alignment along the Ashley River provides a significant opportunity to increase public access to the riverfront.
- The perimeter protection is going to impact how stormwater runoff flows and drains within the wall. Surface storage of runoff and other nature based solutions will help make stormwater management within the wall more manageable and resilient and should be considered wherever feasible.
- The Dutch Dialogues Charleston presents concepts for managing surface water runoff, coastal protection, and groundwater in a cohesive manner. It’s important tha this project consider and incorporate practices to mitigate adverse impacts to groundwater.
I encourage you to submit comments during this period and to stay engaged as this project progresses. There will be another public comment period in January of 2021.