Storm Drain GIS Mapping

By KCI Technologies Inc.

Solution details




KCI assisted the Maryland State Highway Administration with various tasks related to the National Pollutant Discharge Elimination System (NPDES) permit program under four consecutive open-end contracts, totaling $4 million. Storm Drain GIS Mapping: As one of the largest owners of stormwater infrastructure in the state, a comprehensive inventory was required using geographic information system (GIS) technology. This source identification work required both office and field data collection using engineering drawings and GPS technology. KCI developed a standard procedure to perform the work, which was documented and provided to SHA as the standard by which all consultants would perform similar work. KCI implemented the procedure in Montgomery, Baltimore, and Frederick Counties. The source identification process began with SHA providing KCI with construction drawings to review in order to identify all components of the storm drain infrastructure. As each contract was obtained, a GIS entry was made to graphically depict the roadway extent. General database fields were populated for tracking purposes. The GIS tracking coverage provided a quick analysis to determine which contract sets should be reviewed during the data conflation process. A trained technician then reviewed the contract sets and highlighted potential stormwater features for field staff. In the field, a GPS receiver was utilized to obtain a sub-meter location of each structure while capturing basic attribute information such as structure type and material. At the end of each field day, GPS points were downloaded and viewed with respect to digital orthophotography to verify consistency of the spatial data. With the correct layout of the storm drain point features determined in the field, the database entry process began. Engineering technicians reviewed the contract sets and field notes to capture GIS feature attributes such as pipe size, material, length, shape, etc. KCI developed an application to automatically generate pipes within the GIS using the connection data in database tables. As each section of roadway was completed, the GIS layers were synchronized with a master GIS file. During the field verification process, water quality samples and structural inspections were performed at outfalls while stormwater management ponds were inspected and assigned a rating for future SHA maintenance.


Archaeological & Historic Preservation, Environmental Management, GIS, Highways & Roads, Homeland Security, Information Technology, Parks & Recreation, Public Safety, Public Works

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