Mission: SEMSWA provides Stormwater Management services essential to the protection, preservation and enhancement of our neighborhoods, community and natural resources through:
For more information on SEMSWA, please explore this website as well as our 2012 Annual Report.
Click image to view map
SEMSWA was formed in 2006 by an Intergovernmental Agreement among the following entities:
City of Centennial
Arapahoe Water and Waste Water Authority
East Cherry Creek Valley Water and Sanitation District
Inverness Water and Sanitation District
PROJECT NEWS: SEMSWA releases RFP for Enterprise Software
SEMSWA is seeking proposals for an Enterprise Software System that will track stormwater assets, MS4 permit activities, land development reviews, work management activities, and more. If interested, please click the link below to access the RFP page.
PRESS RELEASE: SEMSWA assesses flooding damages after September 2013 storms.
Following the unprecedented flooding of the past week, the Southeast Metro Stormwater Authority (SEMSWA) staff will be conducting an inventory of all affected stormwater management facilities and drainageways to determine what repairs will be necessary in the weeks and months to come. Fortunately, the eastern part of Centennial that experienced the most intense and sustained rain of the week-long storm event has Regional detention and water quality ponds. These ponds are built to hold back collected rainfall and release at a specified release rate for a large storm event, and they accomplished the goal of not contributing additional flows to the already swollen creeks in Centennial.
The Southeast Metro Stormwater Authority is pleased to announce a revised permit structure for Directional Boring associated with Utility Installation. In an effort to streamline the permitting process, an Annual Permit for Directional Boring will be effective for qualifying projects as of July 1, 2012. Project Owners can apply for an Annual Permit and obtain authorization to conduct the activity without an individual permit. Click here for more information on the Annual Permit, or email questions to firstname.lastname@example.org or call the Water Quality Department at 303-858-8844. For general information on SEMSWA GESC Plan and Permit Requirements, please click here.
NOTICE: Updated Floodplain Permit Available.
SEMSWA has updated the Floodplain Permit format for all applicable projects in the City of Centennial. Please click here to access the new permit.
PROJECT HIGHLIGHT: Piney Creek Website.
SEMSWA, UDFCD, and CH2MHill have launced a new website to help address the balancing of sediment in Piney Creek. Please click the link below to access the site and learn more about stormwater efforts in Piney Creek!
Some foam or suds in the stream is natural, especially as snowmelt runoff occurs in the spring. When aquatic organisms, such as algae, die and begin to decompose, fatty acids are produced. These fatty acids are very similar to those found in common soap products. Aeration of the water as it cascades over rocks causes the fatty acids to form foam, often accumulating along shorelines and river banks, and in coves and eddies.
Foam is generally white in color, breaks down relatively quickly, and smells like fish or earth. Foam from silt or erosion is usually a dirty brown color. In contrast, foam from detergent will have a noticeable perfume smell from the additives which give your wash a fragrant scent. Natural foam is often seen in early morning and is usually gone by midday.
If you see foam in the stream that looks like bubble bath, has a perfume scent and doesn't break apart easily, detergent may be in the stream. If so, please notify SEMSWA, 303-858-8844, or Arapahoe County Sheriff’s dispatch during non-business hours.
VIEW VIDEOClick on the image above to view a video of flooding within the Authority area (2 MB)