Stormwater Management-Pump Stations/Tide Gates
A tide gate structure will be integrated into the coastal flood protection and raised roadway on Kimball Terrace. It will restore ecological function to the wetlands and protect the neighborhood from tidal events. In addition, upgrades to the subsurface drainage system and construction of coastal flood protection will necessitate the installation of several pump stations to discharge stormwater into the Elizabeth River.
Stormwater Management -Water Retention Street Retrofit
To reduce stormwater flooding during 10-year rain events, several streets will be retrofitted with green infrastructure and drainage network improvements to slow, store and infiltrate stormwater. In addition to reducing flooding risk, streets retrofits will help minimize pumping requirements, demonstrate green infrastructure techniques, increase pedestrian access and safety, and beautify the neighborhoods.
Stormwater Management -Parcel Level Water Retention
As part of the multilayered approach to addressing storwmater flooding, parcel-level water retention improvements such as rain gardens will improve capacity to store water and reduce the intensity of stormwater runoff within the neighborhood.
Stormwater Management -Parcel Level Education Program
As part of the stormwater collection program and in order to bring about a community wide sense of responsibility for personal environmental impacts, the city will implement various initiatives to educate residents about the benefits of parcel- and street-level water retention green infrastructure.
Stormwater Management -Retention Ponds/Restored Wetland
The project takes advantage of the city's historic hydrology. Several wetland areas and filled tidal inlets will be restored to improve the capacity to store water.
Coastal Management-Living Shoreline
Living shorelines will provide erosion protection for coastal flood defense structures while creating new habitat and improving ecological functions of the Elizabeth River.
Coastal Management-Flood Walls
Several locations along the river front have inadequate space to provide a properly sloped berm due to the existing infrastructure in the project area. In these areas, a vertical flood wall is proposed on the river side.
Coastal Management-Coastal Berm
A gradually sloped, vegetated berm will be built as a part of the coastal protection system to keep storm surge out of the Chesterfield Heights and Grandy Village neighborhoods. The berm will be visually integrated into the existing landscape.
Coastal Management-Road Improvements
There are only two vehicular access routes into the area, and they are subject to flooding during storm events. Additionally, several roads within the neighborhood are impassable during heavy rain or high tides due to their low elevation or insufficient drainage capacity. To address this issue, critical roads will be raised to more than eight feet above sea level to provide dry and safe egress for residents. Roads that cross the coastal flood protection structures will be raised to 11-plus feet.
The project will require public easements on some existing private property to construct the coastal flood protection features.
Ohio Creek Watershed Planning
Over the past several months, the Ohio Creek Watershed Project has seen many ideas, concepts and strategies tested through charrettes, work sessions, and public meetings. In September, these efforts resulted in the final conceptual design which determined coastal and stormwater project elements that will progress to the schematic design and environmental permitting.