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

Utility Design — Water, Sewer & Relocations

Every land development project depends on reliable utility infrastructure. Our engineers design complete water distribution and sanitary sewer collection systems coordinated directly with local utility authorities — and we manage the full scope of utility relocations, encroachment permitting, and third-party utility coordination that most projects require.

From water pressure analysis and fire flow modeling to aerial sewer crossings and Duke Energy relocation plans, we handle all utility disciplines under one roof so nothing falls through the cracks between consultants.

• Water line routing, sizing, and pressure analysis
• Fire flow analysis and hydrant placement
• Gravity sewer collection system design
• Aerial sewer crossing design
• DOT encroachment permitting for water and sewer relocations
• Duke Energy coordination — relocation plans and lighting plans
• Meter sizing, service laterals, and backflow prevention
• Flow projections and capacity analysis
• Utility authority coordination and system extension agreements
• NCDWQ, SCDHEC water and sewer system approvals

Feasibility Study

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

City Planning & Entitlement Services

Land development projects frequently require approvals that go beyond standard engineering permits — rezonings, annexations, special use permits, and other planning entitlements. Hagen Engineering guides projects through the full planning process, attending hearings, preparing exhibits, and coordinating with planning staff while simultaneously developing the engineering design.

Having a civil engineering firm involved from the beginning of the entitlement process ensures that technical questions about grading, drainage, traffic, and utilities are addressed proactively — strengthening your application before it reaches the planning board.

• Rezoning applications and supporting documentation
• Annexation petitions and utility extension coordination
• Planning board hearing attendance and presentations
• City council hearing support and technical testimony
• Pre-application meetings with planning staff
• Special use permits and conditional zoning
• Ordinance interpretation and compliance analysis

Construction Administration

The engineering process doesn't end when permits are issued. Construction administration is the critical phase where design meets field execution — material substitutions, field conditions that differ from design assumptions, and contractor questions all require timely engineering response to keep the project on track and built as designed.

Hagen Engineering provides construction-phase services that maintain design integrity from the first submittal review through final permit close-out and as-built documentation.

• Structural and shop drawing review
• Material submittal review and substitution evaluation
• As-built drawing procurement and review
• Utility testing coordination and witnessing
• Permit close-outs and bond release coordination
• Periodic field inspections with documented reports
• Contractor RFI responses and design clarifications