Civil Engineering Services
Built for Land Development

Site & Civil Engineering Design

Complete site/civil engineering drawings are the backbone of any land development project. Our team produces permit-ready drawings that accurately reflect site conditions, satisfy local ordinance requirements, and are designed to minimize contractor RFIs during construction.

We approach every project by evaluating cost, constructability, and function simultaneously — producing designs that work in the field, not just on paper.

• Grading and drainage plans
• Erosion and sediment control design (E&SC)
• Site layout and geometry
• Pavement design and parking layout
• Horizontal and vertical road geometry
• NCDOT/SCDOT driveway permits
• Construction document packages

Stormwater Quality & Quantity Design

Stormwater management is one of the most complex and consequential aspects of land development. Improperly sized or designed stormwater systems lead to permit rejections, costly redesigns, and long-term liability for developers.

Our stormwater engineers design systems that satisfy state and local requirements on the first submittal — from simple pipe systems to complex multi-stage detention ponds and water quality BMPs.

• Detention and retention pond design and sizing
• Best Management Practice (BMP) selection and design
• Stormwater management reports
• Water quality compliance (NCDEq, SCDHEC, GAEPD)
• Bioretention, rain gardens, and infiltration systems
• Drainage studies and floodplain analysis
• Stormwater maintenance agreements

Water Distribution Design

Reliable water service is fundamental to any development. Our engineers design water distribution systems that ensure adequate domestic and fire flow for your project from day one — coordinated directly with local utility authorities to prevent delays during permitting and construction.

• Water line routing and sizing
• Fire flow analysis and hydrant placement
• Meter sizing and service lateral design
• Backflow prevention design
• Local utility authority coordination
• Water system extension agreements
• NCDWQ, SCDHEC water system approvals

Sanitary Sewer Collection Design

Sewer system design requires careful attention to grades, flows, and long-term maintainability. Our engineers design gravity sewer systems that satisfy local municipality standards and are built to be maintained and accepted into public ownership without issues.

• Gravity sewer collection system design
• Flow projections and capacity analysis
• Sewer extension and connection permitting
• Utility authority coordination and approval
• Manhole and cleanout design
• Aerial sewer crossing design

Site Selection & Feasibility Analysis

Making an informed land acquisition decision requires understanding the engineering constraints of a site before you close. Our team evaluates sites quickly and accurately — giving developers and investors the information they need to negotiate, acquire, or pass on a property with confidence.

• Preliminary site layout and yield analysis
• Zoning analysis and use verification
• Local ordinance and setback investigation
• Utility availability and capacity assessment
• Topographic and slope feasibility review
• Wetland and floodplain preliminary screening
• Entitlement timeline and cost estimates

Permitting & Consultant Coordination

Land development projects require a team of specialists — surveyors, environmental consultants, geotechnical engineers, wetland scientists, and more. Hagen Engineering serves as the lead civil engineer and overall project coordinator, managing the full consultant team so you have one accountable point of contact throughout the entitlement process.

• Land disturbance permit applications
• Plan review coordination and response
• Survey and topographic coordination
• Environmental and wetland consultant management
• Geotechnical investigation coordination
• NCDOT / DOT driveway and encroachment permits
• Pre-application meetings with reviewing agencies

Earthwork Quantity Takeoffs & Grading Analysis

Earthwork is frequently the largest variable cost on a land development project. An unbalanced site — where cut and fill volumes don't match — can result in hundreds of thousands of dollars in material import or export costs. Our grading engineers perform detailed quantity takeoffs and design grading plans with earthwork economy as a primary objective, not an afterthought.

We analyze existing topography against proposed improvements to calculate precise cut/fill volumes, optimize material movement, and evaluate multiple grading scenarios to minimize your project's earthwork costs before construction begins.

• Cut/fill volume calculations with shrinkage and swell factors
• Mass haul optimization and material movement diagrams
• Earthwork balance analysis and design scenario comparison
• Stripping and topsoil preservation quantities
• Import/export cost impact analysis
• Subgrade preparation and structural fill quantity reports
• Coordination with geotechnical data for material suitability