Civil Engineering Services on Kaua‘i

Property Due Diligence & Feasibility Studies

Property due diligence and feasibility studies help determine whether a property can realistically support a proposed project before significant time and money are invested in purchasing property, design, permitting, and construction. We evaluate site conditions, drainage, grading, infrastructure, regulatory requirements, and development constraints to identify potential challenges early in the planning process.

This early evaluation helps property owners make informed decisions, reduce project risks, and move forward with greater confidence.

Infrastructure Planning and Design

Successful projects depend on more than a single utility or roadway. Infrastructure planning coordinates drainage, water, wastewater, grading, roadways, and other site improvements into a complete, functional system that supports the property's long-term development.

Coordinating these systems early creates a more efficient, functional, and integrated development.

Grading Plans

Grading plans establish how the land will be graded to support drainage, access, utilities, building pads, and other site improvements. Proper grading helps manage stormwater, improve site stability, and create a solid foundation for development.

Effective grading balances site conditions, drainage, access, and

construction requirements while optimizing earthwork to create efficient, functional sites and help control construction costs.

Roadway & Driveway Design

Roadways and driveways provide more than access—they form the backbone of a site's infrastructure. We prepare engineering plans for private roadways, subdivision roads, driveways, and driveway connections to public roadways.

Roadways also serves as an important part of a development's drainage system, collecting and conveying stormwater to help manage runoff during major storm events. Coordinating roadway design with grading, utilities, and drainage creates efficient, functional infrastructure that supports long-term site performance.

Water System Design

Water system design provides reliable water service for residential,

commercial, and infrastructure projects. Proper design evaluates

available water supply, system pressure, fire protection requirements, and site conditions to support the proposed development.

We prepare construction drawings for water meters, water mains,

service connections, fire service connections, water system improvements, and private water systems.

Septic & Wastewater System Design

Many properties on Kauaʻi rely on onsite septic systems because public sewer service is not available. Proper septic and wastewater system design evaluates soil conditions, site constraints, wastewater flows, and regulatory requirements to develop reliable treatment and disposal systems.

We prepare construction drawings for new septic systems, aerobic treatment systems, cesspool conversions, and other onsite wastewater systems for residential, commercial, and multi-family developments.

Drainage System Design

Drainage systems safely collect, convey, and manage stormwater to protect buildings, roadways, and other improvements. Proper drainage design evaluates site conditions, runoff patterns, and stormwater flows to reduce flooding, erosion, and drainage impacts.

Good drainage design also considers downstream drainage impacts to prevent creating problems for neighboring properties and the surrounding watershed.

We prepare construction drawings for drainage systems, culverts, swales, channels, storm drains, detention facilities, and other stormwater infrastructure.

Drainage Studies and Reports

Drainage studies and reports provide the engineering analysis and supporting documentation for drainage system designs. They evaluate existing and proposed drainage conditions, runoff patterns, and stormwater management requirements to support the design of safe and effective drainage systems.

We prepare drainage studies and reports for residential, commercial, and subdivision projects in accordance with applicable engineering standards.

Backflow Preventers

Backflow preventers protect the public drinking water system by preventing contaminated water from flowing back into the water supply. The County of Kauaʻi Department of Water requires engineered construction drawings for backflow prevention assemblies.

We prepare construction drawings for new and existing backflow prevention assemblies required by the County of Kauaʻi Department of Water.

Fire Hydrant Flow Tests & Calculations

The County of Kauaʻi Department of Water may require a fire hydrant flow test and engineering calculations before approving certain developments or building permits. Fire hydrant flow testing evaluates the available water flow, pressure, and hydrant spacing to determine whether the existing water system provides adequate fire flow for the proposed development.

We perform fire hydrant flow testing, prepare the required engineering calculations, and provide the signed engineering documentation required by the County of Kauaʻi Department of Water.