Chapter 3 — Determining Minimum Requirements

Per Chapter 12.08 KCC, “project site” means “portion of a property, properties, or right of way subject to land disturbing activities, new hard surfaces, or replaced hard surfaces.” Such activities can negatively affect stormwater runoff from the project site. This chapter contains seven basic steps used to determine which minimum requirements for on-site stormwater management, flow control, and runoff treatment apply to a project site:

• Step 1 – Define the Boundaries of the Project Site

• Step 2 – Identify the Receiving Water and Downstream Conveyance

• Step 3 – Review Minimum Requirements Exemptions

• Step 4 – Perform Site Assessment and Planning

• Step 5 – Calculate New Plus Replaced Hard Surface and Native Vegetation Conversion

• Step 6 – Calculate New Plus Replaced Pollution Generating Surface

• Step 7 – Determine Which Minimum Requirements Apply

• Step 8 – Delineate Threshold Discharge Areas (if applicable)

Note that these steps are focused on determining applicable minimum requirements for on-site stormwater management, flow control, and runoff treatment specifically. Applicants must also review and comply with all other minimum requirements listed in Volume I, Chapter 4, including preparation of a stormwater site plan, control of site construction stormwater, source control, preservation of natural discharge location, wetland protection and operation and maintenance. Each of the seven steps is described in further detail below.