Civil Engineering Services on Kaua‘i

Feasibility Studies

Feasibility studies help determine what a property can realistically support before design begins. Site conditions, drainage patterns, grading constraints, infrastructure requirements, government requirements, and permitting considerations are evaluated early to help reduce delays and improve project planning.

Projects are reviewed from both a technical and practical perspective to support informed decisions before design and permitting move forward.

Infrastructure Planning and Design

Infrastructure planning coordinates the systems that allow a site to function properly. This includes drainage, grading, utilities, roadway access, and wastewater infrastructure.

Projects on Kaua‘i often require careful coordination between land conditions, permitting requirements, and lasting maintenance considerations. Systems are developed to work together efficiently while supporting practical construction and lifelong usability.

Grading Plans

Grading plans establish how water moves across a site and how development integrates with the natural terrain. Proper grading supports drainage control, site stability, infrastructure placement, and enduring usability.

Projects are developed around existing land conditions to help reduce erosion, drainage conflicts, and construction issues during development.

Roadway Design

Roadway design focuses on safe, functional access aligned with terrain, grading, and infrastructure requirements. Proper roadway planning supports circulation, construction access, utility coordination, and ongoing maintenance access.

Projects are tailored to the unique characteristics of the site while supporting reliable functionality over time.

Water System Planning and Design

Water systems must be coordinated carefully with grading, infrastructure, utility placement, and sustained maintenance access. Elevation changes, pressure requirements, and site layout all influence system functionality. Planning also accounts for health and safety requirements, including fire protection standards related to hydrant spacing, water availability, and system pressure.

Papa'iki Engineering Inc. provides water system planning and design that supports reliable operation while aligning with permitting and infrastructure requirements on Kaua‘i.

Septic & Wastewater System Design

With limited access to public sewer services in many areas of Kauaʻi, effective onsite wastewater management remains essential. State regulations are driving the transition from aging cesspools to modern wastewater treatment systems that meet current environmental standards.

Papa'iki Engineering Inc. provides:

• Septic system design
• Wastewater system planning
• Cesspool conversion support
• Drainage and grading coordination
• Permitting support

Projects are designed around drainage conditions, terrain, soil characteristics, and extended system functionality. Proper coordination early in the process helps reduce delays during permitting and construction.

Drainage System Design

Drainage systems play a critical role in protecting structures, infrastructure, wastewater systems, and overall site stability. Projects on Kaua‘i require drainage solutions developed around rainfall patterns, terrain, runoff behavior, and future-focused maintenance considerations.

Systems are developed to manage water movement effectively while supporting practical construction and reliable ongoing performance.

Drainage Studies and Reports

Drainage studies evaluate how rain water moves across a property and identify requirements for stormwater management, runoff control, and permitting.

Technical analysis and reporting help support infrastructure planning, drainage design, and agency review processes while reducing conflicts during development.

Permitting Solutions

Successfully moving a project from concept to construction often depends on navigating a complex network of reviews, approvals, and compliance requirements. Papaʻiki Engineering helps guide projects through these processes by preparing technical documentation, coordinating with reviewing authorities, and addressing regulatory requirements unique to each development.

As a locally established firm on Kauaʻi, Papaʻiki Engineering maintains strong familiarity with regional processes and agency expectations. This local presence supports efficient communication, timely responses to review comments, and continued assistance as projects progress through the approval stages.



The team's background working with public agencies provides additional insight into administrative procedures, helping clients anticipate requirements, avoid unnecessary delays, and keep projects moving forward.

Backflow Preventers

Backflow preventers are required by the County of Kaua‘i Department of Water (DOW) to protect the domestic water supply from contamination.

Papa'iki Engineering Inc. provides:

• Construction Drawings: Professional engineering plans for backflow preventer assemblies.
• Agency Approval: We work directly with the Department of Water to get your backflow preventer plans approved.
  

When are these required?

The DOW typically mandates a backflow preventer for:

• Agricultural Lots: Any property with agricultural zoning.
• Pools: Properties with swimming pools or water features.
• Contamination Risks: Any site use the DOW identifies as a possible cross-connection source.
  

Fire Hydrant Flow Tests & Calculations

The County of Kaua‘i Department of Water requires a Fire Hydrant Flow Test before many new development projects or infrastructure improvements can be finalized. This test ensures the existing water system provides the necessary pressure (PSI) and volume (GPM) for fire protection.

Papa'iki Engineering Inc. provides:

• Field Testing Coordination: We perform fire hydrant flow testing and coordinate directly with the Department of Water Operations Division, whose personnel are present on-site during testing to ensure proper procedures and documentation.
• Fire Flow Calculations: Preparation of the fire flow calculations and supporting documentation required by the Department of Water based on field test results.