Central Sanitation

Central Sanitation

Central Sanitation (Millersville, MD)

BioHabitats Collaboration Project

Central Sanitation is an integrated RSC system seamlessly connecting storm water management features within the developed section to the regenerative stream channel restoration. Our role on this project was design and construction management. The original incised channel extended 1,700 linear feet. Our design realigned the channel and incorporated a curvilinear flow path resulting in a new channel that runs 2,500 linear feet. U&A’s redesign of this project saved the County approximately $2 million compared to their original plans for this site while also saving 35 acres of riparian forest that were slated for removal with the original design.

The project at Central Sanitation was developed to retrofit water resource problems resulting from aging development and to bring the stormwater management systems up to current regulatory standards. Development prior to the 1970’s required civil engineers to vent the water as quickly as possible off of the landscape and convey it down to receiving waters of streams or tidewater; today regulations seek to repair the damage done by this misunderstanding of water resources and preserve and restore our high value stream valleys in order to restore water quality to the Chesapeake Bay.

In the upland parking area, our design called for depressed vegetated islands to allow drainage into a cobble seam which feeds the restored stream channel.  This bioretention technique led to the elimination of traditional storm drains in the developed area.  Additionally, our design modifications included a cobble-bedded parking area to better manage storm flows and roadside RSCs to capture and treat stormwater.

This project is situated on geologic formations of acidic sands layered between confining layers of sandstone, silts, and clays. These conditions were the driving force for near surface recharge of shallow aquifers that allowed for bog development following the Hollocene Period. Our project approach respected the native geology and incorporated it into the final design plan.


Like Mill Creek, this project was a County project. It is located in an urban area on County-owned property with and a high concentration of impervious surface and stormwater runoff. Creation of a step pool system stopped erosion of the stream channel, enhanced stream and riparian functions, and allowed for nutrient and pollutant reduction to the receiving waters. The project incorporates larger pools in place of stormwater ponds and incorporates several outfalls, and assists the County in making progress toward its MS4 and TMDL goals.  This project won 2015 Best Urban BMP in the Bay (BUBBA) award in the Best Combination of BMPs in a Series category.

Completed in 2010,  is an integrated Regenerative Stormwater Conveyance system seamlessly connecting storm water management features within the developed section to the regenerative stream channel restoration.  The original incised channel extended 1,700 linear feet while the new channel runs 2,500 linear feet. U&A’s redesign of this project saved the County approximately $2 million while also saving 35 acres of riparian forest that were slated for removal with the original design.

In the upland parking area, vegetated islands were depressed to allow drainage into a cobble seam which feeds the restored stream channel. This technique has led to the elimination of traditional storm drains in the developed area.

The length and slope of the Central Sanitation project are similar to those found at Kingsberry Drive. It is situated on geologic formations of acidic sands layered between confining layers of sandstone, silts, and clays unique to Anne Arundel County. These conditions were the driving force for near surface recharge of shallow aquifers that allowed for bog development following the Holocene Period.

Central sanitiation video

Central Utility Operations Stormwater Management and Stream and Wetland Restoration Project (provided by Chesapeake Stormwater Network featuring Joe Arrowsmith-Ecological Engineer)