Discover the essentials of stormwater management in our ‘Honolulu Stormwater Guide: Navigating Impervious Surfaces’. This comprehensive guide demystifies the Residential Storm Water Management Plan (RSWMP) implemented by the City and County of Honolulu. Learn about the impact of impervious surfaces, such as rooftops and driveways, on your property and the environment. Understand the importance of keeping impervious surface area (ISA) below 75% of your total property area and the strategies to manage rainwater effectively. Our guide also explains the process of plan approval and the responsibilities of property owners. For properties with more than 75% ISA, learn about the ‘Existing Nonconforming Impervious Surface Acknowledgement’ form and its implications. This guide is essential for property owners in Honolulu aiming to contribute to effective stormwater management and sustainable urban development. Dive in to navigate the complexities of stormwater management in Honolulu.
To summarize, if you are a homeowner or contractor in Hawaii in need of residential design, swimming pool design or drafting services, then we at Owner Built Deign are here to help. We have over 30 years of experience helping our clients with all aspects of their residential projects, from the initial design and planning stages all the way through to permitting and ESCP coordination during construction . So whether you need help with your home’s floor plan or want to add a beautiful pool to your property, we have the knowledge and expertise to make your vision a reality.
The Erosion and Sediment Control Plan requirement imposed by the Department of Permitting and Planning affects all construction projects that disturb the property. To comply, an Erosion and Sediment Control Plan must be submitted, which depends on the amount of ground being disturbed and the slope of the property. For residential projects, the plan falls under Category 1A if the job is less than 1,000 square feet with a slope of 15% or less, and Category 1B if the job is larger than 1,000 square feet or less than 1,000 square feet but with a slope greater than 15%.
Calculating the slope of the construction project is a crucial step in determining the appropriate Erosion and Sediment Control Plan. The slope is calculated by measuring the height of the slope (rise), measuring the distance from the top of the slope to the end (run), and dividing the rise by the run, then multiplying the result by 100. If the slope is less than 15%, the Category 1A plan must be filled out, and if it exceeds 15%, the Category 1B plan must be used.
It is important to regularly check the regulations set by the Department of Permitting and Planning to stay updated. Owner Built Design, LLC offers more information about home design plans.