Seminole County – Lake Harney Drainage Basin

About the Project


Geosyntec Consultants, Inc.


Seminole County, FL


14,000 acres


180°x360° views of survey location and structure interiors, omni-directional imagery, assisted County in Watershed Resiliency Program


  • Hydraulic Survey
  • Condition Assessment
  • Topographic Survey

Seminole County

The Lake Harney Basin is the easternmost watershed in Seminole County, covering roughly 22 square miles (14,000 acres). Due to flooding caused by recent extreme weather events and being an area of older development with no detailed evaluation of the stormwater drainage characteristics on record, the County undertook the Lake Harney Watershed Flood Resiliency Plan. SSMC was commissioned by Geosyntec Consultants, Inc. to perform a series of Hydraulic and Hydrologic (H&H) topographic surveys at specific locations within the basin for the purpose of stormwater modeling.

Hydraulic surveys included the location and determination of all pertinent structure data, including water surface elevations, flow lines, cross-sectional areas, materials, conditions, and invert elevations upstream and downstream at any structure within the reach of the survey. To control costs, SSMC employed RTK GPS to establish local controls at remote locations, providing the required vertical and horizontal accuracy. Conventional survey techniques were used to collect precise location and elevation data for each required hydraulic element. Then survey teams created field notes and sketches with detailed measurements and conditions assessment of desired drainage control elements and devices. Omni-directional (panoramic) images were collected to provide engineers with 180°x360° views of each survey location and structure interiors. Survey data, scanned pdf field notes, and images are used to create and are included within a GIS (Geographic Information System) that is designed to be compatible with stormwater modeling software, allowing engineers to easily migrate field data into their modeling software.


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Byron Osborn

NBC Universal, Orlando

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The Walt Disney Company

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TJ Kelley

Quanta Telecom Services

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Hayward Thomas

Mayor of the Town of Paxton

“Your guys out there were great, very professional and hard working.”

Scott Shelton

Rayken, Inc.

“Thanks again for a great job. Please let your team know how grateful we are to your tireless diligence in preparing a living database of information.”

Lisa Henry

City of Orlando