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Horizon Hill SWM Project
About the Project

Improvement to the Horizon Hill stormwater management facilities and surrounding stream valley was recommended in the 2001 Watts Branch Watershed Study completed in August 2001 and later approved by the Mayor and Council. The goals for the project, which was completed in 2016, included restoration and protection of the stream valley, enhanced water quality and stormwater management, erosion repair and prevention, and protection of park amenities.

Restoration activities included:
  • Reduce flooding potential of adjacent properties
  • Stream bank stabilization
  • Erosion repair and prevention
  • Restoration and protection of the stream valley
  • Sediment removal from the ponds
  • Enhanced water quality and stormwater management
  • Protection of park amenities

Throughout Horizon Hill Park stream valley near Longhill Drive, Pebbleridge Court, and S Fallsmead Way
View project map

Site Maintenance

As part of an ongoing maintenance plan, the City will perform annual monitoring of the project site to ensure no major stream stability issues. Maintenance would include sediment removal and any repairs needed to the pond infrastructure. 

City of Rockville - Stormwater Fund
Maryland DNR - Chesapeake and Atlantic Coastal Bays Trust Fund 

State of Maryland logoMaryland DNR logo
Status: Completecheck mark 
Horizon Hill before photo

BEFORE: Erosion at Horizon Hill caused unstable stream banks and sediment pollution.

Horizon Hill

AFTER: Horizon Hill has returned to a healthy, natural habitat and community green space.