The Waltham Watch Factory lies on the banks of the Charles River, 13 miles upstream from downtown Boston. The 12-acre property, which is listed on the National Register of Historic Places, features 22 interconnected brick buildings that total 400,000 s/f of interior space. Designing the site's historic courtyard spaces was a significant part of the landscape renovation, but only one aspect of a broader stormwater-mitigation strategy that was implemented across the entire site. The design team adopted existing industrial language from the 150-year-old factory landscape and applied modern stormwater practices to mitigate rainwater that collects on roof, parking, and hardscape surfaces.