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Herring Run Sewershed Improvements. Baltimore, Maryland.

WRA designed sewer and manhole rehabilitations for a portion of the Herring Run Sewershed. The project includes more than 50,000 LF of sewer pipe ranging in size from 6 to 24 inches in diameter.

As required by Baltimore’s Consent Decree with EPA/MDE, sewer system improvements included both hydraulic and structural improvements intended to eliminate sanitary sewer overflows (SSOs) by providing additional hydraulic capacity and reducing infiltration and inflow (I&I). Rehabilitation techniques included cured in place pipe (CIPP) lining point repairs, replacement sewers, joint grouting and rehabilitation of sewer house connections.

Herring Run Sewershed
Project Highlights

Collection/Gravity Sewers

Based on a review of CCTV videos, WRA recommend repair or replacement of damaged sewers. Cured-in-place pipe (CIPP) linings were the primary means of rehabilitation. Also utilized were joint grouting, excavated and non-excavated point repairs, and relining of sewer house connections.


Tree surveys were conducted to develop a Forest Conservation Plan and a Tree Replanting Plan in Herring Run Park. A Joint Permit Application was sent to Maryland Department of the Environment and US Corps of Engineers for construction in the floodplain.