1.2.3 Review Stages

This section defines three stages of drainage review, including Site Assessment and Planning Review, Preliminary Design Review, and Final Design Review. Not all stages of drainage review are required for all projects. The applicability of each review stage based on the drainage review type and the basic requirements for each review stage are described below.

Vol II–1.3 Submittal Processes and Requirements summarizes the plan and report submittals required for each stage of review.

1.2.3.1 Site Assessment and Planning Review

For all drainage review types, this review stage entails completing permit applications and conducting a site assessment and planning study to evaluate and document the early consideration of project and site components that affect design. Vol I–2.5 Submittal Requirements outlines the requirements for site assessment and planning and Vol II–1.4.1 Site Assessment and Planning Packet details the associated submittal document required.

1.2.3.2 Preliminary Design Review

Preliminary design review is required for any proposed project that requires a land use permit or approval. The purpose of this review stage is to demonstrate that the project is feasible and can meet the applicable standards and requirements. All preliminary submittal documents shall be at 60 percent level of design, or higher.

All land boundary surveys and legal descriptions used for preliminary design review shall be stamped by a land surveyor licensed in the State of Washington. Topographic survey data and mapping prepared specifically for a proposed project may be performed by the professional engineer stamping the engineering plans as allowed by the Washington State Board of Registration for Professional Engineers and Land Surveyors.

The plan set shall follow the requirements of site improvement plans (Vol II–1.4.2 Site Improvement Plans) and shall contain the base map, the basic site plan requirements, plus the following:

1. Professional engineer's seal, signed and dated.

2. Professional land surveyor’s seal, signed and dated, where applicable.

3. Contour lines, at maximum 5‑foot intervals, with source of datum identified.

4. If connecting to Kitsap County Sanitary Sewer, see Kitsap County Public Works (KCPW) Standards for Sanitary Sewer Extensions additional site plan requirements.

5. Approximate plan for the collection and conveyance of stormwater through the project site. At a minimum, show with flow arrows the directions of proposed stormwater runoff and indicate the method for conveyance (e.g., pipe, ditch, bioretention filter, overland flow, etc.).

6. Proposed locations and sizes of stormwater Best Management Practices (BMPs), including typical cross-sections for on-site stormwater management, flow control, and water quality treatment facilities. Refer to Volume II, Chapter 5 for stormwater BMP design requirements.

7. For any proposal that includes public or private roadway construction or improvement, including but not limited to subdivisions, short subdivisions, large lot subdivisions and performance-based developments, provide road plan and profiles in accordance with Kitsap County Road Standards, Title 11 KCC, showing existing grade and approximate finished grade. Private roads may not have to be built to the same standard as public roads, but the plans shall contain all the same elements.

1.2.3.3 Final Design Review

The objective of the final stormwater design review is to demonstrate that the project designs meet the applicable standards and requirements. All submittal documents in this review shall be at 90 percent level of design. For land use permit and approvals requiring only a simplified drainage review, this final review will occur with the associated building permit for the land use permit or approval. For land use permit and approvals with any other drainage review, the final drainage review will occur with the associated or subsequently required SDAP.

The final design stage submittal shall follow the requirements of site improvement plans (Vol II–1.4.2 Site Improvement Plans) and shall contain the base map, the basic site plan requirements, plus the additional requirements listed for the preliminary design phase (Vol II–1.2.3.2 Preliminary Design Review).