Long-Term Stormwater Management Plan Documents
The Clean Water Act resulted in laws and local regulations that require property owners to be environmentally responsible, whether the property is owned by the government or private owners.  This is necessary because urbanization has increased the volume of runoff and pollutants that reach waterways.  Runoff that previously was slowed down and filtered by native vegetation and the underlying soils before development, now runs off roads, driveways and roofs, and carries everything humans allow to fall on these impervious surfaces, directly to our waterways in increased volumes resulting in damage to the environment.  Feasibly a good way to manage urbanization are drainage systems designed to mimic the earth's natural processes as much as possible.

Riverton City’s Separate Storm Sewer System (MS4) Permit, identifies specific regulations requiring the City to implement regulatory mechanisms that protect our water resources from the impacts of development.  City ordinance (13.20) was passed, to satisfy the MS4 regulation, requiring new development to create a Long-Term Stormwater Management Plan (the plan) and enter into an Maintenance Agreement.    The Long-Term Stormwater Management Plan explains how the site design and following the standard operating procedures (SOP's) will reduce pollutants inherent with this site and its maintenance operations.  The plan is expected to be dynamic and allowed to be modified when SOP's and facility systems do not function properly.  It also includes an inspection element that is required to show the plan is effective at containing and preventing pollution generated on the property.  

City has provided a Long-Term Stormwater Management Plan Template in word format.   The template includes base  plan language including SOP's that can cover many of the issues for most sites.  However, the development's designer is expected to modify the SOP's to conform to the unique site conditions.  The development is also encouraged to include any of their own existing O&M and SOP's documents into the plan.  To facilitate an environment of equality and manageability, development staff must require the use of the Long-Term Stormwater Management Plan template.   The Long-Term Stormwater Management Plan includes an agreement that is recorded on the property, however, when changes to the Long-Term Stormwater Management Plan are desired and warranted, the agreement will remain unchanged and the revision may occur at staff level with the City. 

Riverton Public Works Facility also functions under its own Long-Term Stormwater Management Plan that it available as a model for development.  City staff will use this plan as a benchmark when reviewing Long-Term Stormwater Management Plans created for proposed developments.  However, the City also encourages innovation of sites designs and SOPs that are more efficient at reducing pollutants specific to your property. 

Please understand that the future may bring new EPA regulation and subsequent City ordinances, which might translate to Long-Term Stormwater Management Plan template updates.  The City is committed to operating in an environmentally responsible manner and hopes that you see the vision also.

LTSWMP Templates
Low Impact Development
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