Stormwater Management Services

Industrial facilities, municipalities and development projects face different stormwater permitting and compliance obligations. Additionally, stormwater requirements affect operating facilities, redevelopment projects and new construction. Onterris integrates regulatory knowledge with practical engineering to address National Pollutant Discharge Elimination System (NPDES) permits, Stormwater Pollution Prevention Plans (SWPPPs), erosion and sediment controls, municipal requirements and stream encroachment considerations. This approach helps clients pursue permit approvals and maintain stormwater compliance.

Effective stormwater management starts with understanding how water moves through a site and surrounding watershed. Onterris evaluates existing drainage, land use, runoff volumes, infiltration potential and infrastructure constraints to develop practical management approaches. Stormwater master planning and alternatives analysis help clients prioritize investments, address current deficiencies and plan for development, changing conditions and long-term performance.

Hydrologic and hydraulic modeling provides a defensible basis for understanding runoff, flood conditions and infrastructure performance. Specialists evaluate water budgets, storm events, drainage networks, streams, floodplains, dams and development scenarios. These analyses help identify capacity constraints, assess potential impacts and support informed decisions about infrastructure upgrades, flood mitigation, site development and watershed management.

Industrial and manufacturing facilities may need to retrofit aging drainage networks, create secondary containment systems or manage stormwater treatment without disrupting operations. Developments and institutional properties may require detention, infiltration or green infrastructure integrated with the broader site design. Onterris develops site-specific systems and retrofits that manage runoff, address pollutants, improve performance and account for operational, environmental and physical constraints.

Innovative stormwater solutions increasingly use low-impact development, green infrastructure and engineered controls to mimic the role of nature in controlling and minimizing runoff quality and quantity. Onterris combines engineering, landscape architecture and site expertise to incorporate Best Management Practices (BMPs) into stormwater management designs. Approaches such as bioretention, underground cisterns, permeable pavement, vegetated swales, green roofs, infiltration beds and wetland mitigation can help strengthen the ability of streams and rivers to receive runoff while maintaining or enhancing their aquatic functions.

Stormwater systems require ongoing attention to continue performing as intended. Onterris helps assess existing facilities, identify drainage and maintenance issues and determine where operational changes or infrastructure improvements are needed. Inspection, performance evaluation and retrofit expertise can help organizations reduce flooding and erosion risks, maintain compliance and extend the useful life of stormwater assets.

Brownfields, Superfund sites and other contaminated properties introduce stormwater challenges that extend beyond conventional drainage. Onterris integrates stormwater engineering with remediation expertise to manage contaminated runoff and surface water, erosion and sediment controls, grading, capping, stream channels and construction sequencing. This multidisciplinary perspective helps clients protect receiving waters while advancing remediation, closure or redevelopment objectives.