The Engineering Services group manages maintenance, repair and expansion of Portland's wastewater collection system. The group manages the combined sewer overflow (CSO) program. Engineering Services reviews development plans, issues permits for connections to the City sewer system and manages stormwater runoff from private property. Engineering Services manages the capital improvement plan and oversees design and construction of capital projects. The Watershed Revegetation Division works with landowners to restore native vegetation to degraded stream bank and upland areas.