To support Charlotte’s rapidly expanding population and accelerating development along the CATS LYNX Blue Line Extension, Charlotte Water (CLTWater) advanced major upgrades to the Dairy and Derita tributary sewer branches. As a subconsultant to B.R.S. Inc., STV was selected to future‑proof sewer capacity in both corridors by designing new gravity sewer infrastructure capable of supporting dense, mixed‑use growth – including multi‑family housing, hotels and wastewater‑intensive uses such as craft breweries.
What challenges did STV address?
The project required improving aging sewer systems across three distinct community landscapes: a county-run public park, a residential neighborhood and a commercial district with complex subsurface utilities. STV needed to increase system capacity without impacting traffic, damaging sensitive environmental areas or disturbing active green spaces. Eliminating outdated aerial creek crossings and addressing exposed piping were also key environmental and safety priorities.
What solutions did STV deliver?
STV completed a comprehensive sewer system evaluation survey (SSES) and designed 15,400 linear feet of new 36‑inch to 18‑inch gravity sewers for the Dairy Branch, replacing approximately 8,500 linear feet of smaller‑diameter pipe located within the light‑rail corridor. For the Derita Branch, STV designed 18,500 linear feet of 30‑ to 18‑inch gravity sewers. To minimize surface impacts, the team used microtunneling to cross areas containing solid rock, avoid traffic disruptions, bypass critical infrastructure and eliminate multiple aerial creek crossings. STV also incorporated environmental permitting, utility coordination and removal of exposed piping to preserve natural landscapes.
How does this project benefit the region?
The upgraded sewer infrastructure supports long‑term growth along the Blue Line Extension, improves system reliability, and reduces environmental risk. By designing with resiliency, mobility and environmental protection in mind, the project enhances quality of life for fast‑growing Charlotte communities.
Key Stats and Accolades
- 15,400 LF of new gravity sewers (Dairy Branch)
- 18,500 LF of new gravity sewers (Derita Branch)
- Microtunneling used to avoid disruption and protect natural resources
- Outdated aerial creek crossings removed
- Supports major development along the CATS LYNX Blue Line Extension
