king county surface water design manual

The King County Surface Water Design Manual provides guidance on designing surface water systems, including stormwater management, to mitigate impacts on natural drainage systems in King County effectively always.

Purpose of the Manual

The purpose of the King County Surface Water Design Manual is to provide a comprehensive guide for designing and managing surface water systems, including stormwater runoff, in King County. The manual aims to mitigate the impacts of new development and redevelopment on natural and existing man-made drainage systems. It outlines the requirements and standards for surface water management, ensuring that development proposals meet the necessary criteria to protect the environment and public health. The manual also serves as a resource for engineers, developers, and local governments, providing them with the necessary tools and guidance to design and implement effective surface water management systems. By following the manual’s guidelines, stakeholders can help to reduce the risk of flooding, protect water quality, and preserve the natural environment in King County. The manual’s purpose is to promote sustainable development and environmental stewardship in the region.

Adoption of the Manual

Cities adopt the King County Surface Water Design Manual to guide development proposals effectively always using p tags.

Cities Adopting the Manual

The King County Surface Water Design Manual is adopted by various cities, including the City of Kent and the City of Kirkland, to guide development proposals and ensure compliance with regulations.
The manual provides a framework for designing surface water systems, including stormwater management, to mitigate impacts on natural drainage systems.
Cities adopting the manual must ensure that all new development and redevelopment projects comply with the standards and requirements outlined in the manual.
The City of Snoqualmie, for example, has adopted the 2021 King County Surface Water Design Manual, with an addendum that includes specific requirements for stormwater management in the city.
By adopting the manual, cities can ensure that development projects are designed and constructed to protect surface water quality and prevent stormwater pollution.
The manual is an important tool for cities to manage stormwater runoff and protect the environment, and its adoption is a key step in ensuring compliance with federal and state regulations.

Revisions to the Manual

The manual is revised to include new stormwater treatment options and guidance on using approved soil mixes for better water quality management always effectively.

Stormwater Treatment Options

The King County Surface Water Design Manual includes various stormwater treatment options to mitigate the impacts of new development and redevelopment on natural and existing man-made drainage systems.
The manual provides guidance on designing surface water systems, including stormwater management, to protect water quality and prevent pollution.
New stormwater treatment options are being added to the manual, including the use of High Performance Bioretention Soil Mixes approved by the Washington State Department of Ecology.
These soil mixes can better remove pollutants and sediment from stormwater runoff, improving water quality in King County.
The manual also includes requirements and standards for designing surface and stormwater management systems, including detention ponds, swales, and green infrastructure.
By following the guidance in the manual, developers and engineers can design effective stormwater treatment systems that protect the environment and public health.
The manual is an important tool for managing stormwater runoff and protecting water quality in King County.

Regulatory Framework

King County Surface Water Design Manual is guided by National Pollutant Discharge Elimination System permit requirements and state regulations always effectively.

NPDES Permit Requirements

The King County Surface Water Design Manual complies with National Pollutant Discharge Elimination System permit requirements, which regulate stormwater discharges from municipal separate storm sewer systems.
The manual provides guidance on designing surface water systems to meet these requirements, including stormwater management and treatment.
Permit requirements are established by the US Environmental Protection Agency and the Washington State Department of Ecology.
King County and its cities must comply with these requirements to protect water quality and prevent pollution.
The manual includes information on permit requirements, including application procedures and reporting requirements.
It also provides guidance on designing stormwater management systems to meet permit requirements, including treatment and control measures.
By following the manual, developers and engineers can ensure that their projects comply with NPDES permit requirements and protect water quality in King County.
The manual is an important tool for implementing stormwater management practices that protect the environment and public health.
Overall, the King County Surface Water Design Manual plays a critical role in ensuring compliance with NPDES permit requirements.

Application of the Manual

The manual applies to development proposals within King County, guiding engineers and developers on surface water design and management practices effectively always using standards.

City of Snoqualmie Addendum

The City of Snoqualmie Addendum to the King County Surface Water Design Manual provides additional guidance and requirements for stormwater management in the City of Snoqualmie. This addendum is intended to be used in conjunction with the King County Surface Water Design Manual and applies to all new development and redevelopment projects within the city. The addendum includes specific requirements for stormwater design, construction, and maintenance, as well as additional guidance on low-impact development techniques and green infrastructure. By following the requirements and guidelines outlined in the City of Snoqualmie Addendum, developers and engineers can help to protect the city’s water resources and mitigate the impacts of stormwater runoff on the environment. The addendum is an important tool for ensuring that stormwater management practices in the City of Snoqualmie are effective and sustainable. It is regularly updated to reflect changes in regulations and best management practices.

The King County Surface Water Design Manual is a comprehensive guide for designing and managing surface water systems in King County. The manual provides a framework for ensuring that stormwater management practices are effective and sustainable. By following the guidelines and requirements outlined in the manual, developers and engineers can help to protect the county’s water resources and mitigate the impacts of stormwater runoff on the environment. The manual is regularly updated to reflect changes in regulations and best management practices. Overall, the King County Surface Water Design Manual is an important tool for promoting sustainable and environmentally responsible development in King County. It has been adopted by several cities in the county, including the City of Kent and the City of Kirkland. The manual will continue to play a critical role in shaping the county’s approach to surface water management. Its guidelines and standards will help to ensure a healthy and sustainable environment for future generations.