case studies

Storm Water Digitization



City of Memphis


Storm Water Digitization

The City of Memphis’ storm water infrastructure was digitized from over 100,000 scanned engineering drawings that were first geo-located by CAESER in a large data migration effort 

Using versioned geodatabase architecture, the City’s 100-year-old storm water system was puzzled together into a massive network of pipes, manholes, headwalls, open channels and other structures over an eight-year period.

Previously, a request for engineering plans would take City staff between three to four hours to fulfill. With the system digitized, City officials now have easy access to 100,000 engineering drawings and can respond within minutes to drawing requests.  

Each structure is hyperlinked to the primary engineering drawing used to digitize the feature, thereby maintaining a linkage between the new GIS storm water system and the legacy data.  A robust QAQC process ensures that errors are minimized. The City of Memphis is distributing the GIS storm water network created by CAESER to numerous engineering firms that field validate infrastructure placement and elevations on pipes 24-inch-diameter and larger for the purpose of modeling and flood prevention. 

CAESER will continue to assist the City in their effort to create an accurate storm water infrastructure in GIS. CAESER is assisting some of the engineering firms conducting the field surveys, but is also reintegrating the engineering firms’ corrections back into the original GIS storm water layers whilst ensuring compatibility with SWMM, the modeling package being used to reduce localized flooding and protect citizen’s property from flooding damage.