Westside Diversion Tunnel = Economic Growth for the Quad Cities

Stanley Consultants was retained by Davenport, Iowa to provide initial studies, environmental assessment, permitting, final design, and construction services a new sewer diversion tunnel.

The Quad City metro area boasts a growing population of nearly 400,000 residents but over the past few years the growth has not taken place equally among the cities of Davenport and Bettendorf, Iowa, and Moline, East Moline and Rock Island, Illinois.  Capacity problems in Davenport's sanitary sewer system have severely limited the City's ability to expand.  The primary issue is sewer surcharge (sewer overflow) during wet weather events.  This surcharge can cause basement backups and overflow to area streams and rivers.

The City of Davenport wanted to alleviate this problem by installing a new section of sanitary sewer tunnel on the northwest corner of the city.  The new tunnel will not only provide relief to the remainder of the City's wastewater collection system, it will also allow for 20 square miles of new development, which in turn will offer a significant growth in tax base with the addition of new residential, commercial and industrial properties. 

Stanley Consultants was retained to provide initial studies, environmental assessment, permitting, final design, and construction services for the sewer diversion tunnel.  Several phases were needed to complete the project, first being the preparation of a Collection System Master Plan.  Conceptual designs and site surveys were also conducted before the final design phase was reached. 

The effects of the project are far reaching.  The project has resolved the sewer problems and indirectly enhanced the City's economic base.  The water environment in the Mississippi River and the habitat for local wildlife, waterfowl, and fish has significantly improved.