Storm Drainage Criteria Manual
The City is undergoing a project to update the Longmont Storm Drainage Criteria Manual (LSDCM). The current LSDCM was drafted in 1984. Due to the age, it is severely out of date and has become difficult to implement. The objective of the project is to provide a criteria manual for the City of Longmont that incorporates updated design philosophy for drainage, floodplain and stormwater quality. The new criteria will update the hydrologic dataset with the latest precipitation information, update the design requirements to include the latest tools and processes developed by the Mile High Flood District, and incorporate City specific modifications to the Urban Storm Drainage Criteria Manual Volume III (the currently adopted stormwater quality criteria.
The project has anticipated completion date of 8/31/2025.
Sign up to provide comments on draft chapters.
Goals of the Manual
The goals set forth for the preparation of the Storm Drainage Criteria Manual were:
- To unify standards and improve the quality of drainage evaluation and design by providing specific and detailed criteria for the local communities.
- To reduce the effort required to prepare and review drainage designs by simplifying the methodologies and procedures and by providing numerous worked examples.
- To provide the necessary information to prepare and review a drainage design within a single document that is complete, organized, and easily referenced.
- To provide a drainage evaluation and design criteria that will prevent future drainage problems and enhance the urban environment within the goals and objectives of the community.
If you have questions, please contact Planning & Development Services.
