Planning County Ditch Projects Utilizing LiDAR June 4, 2009 Chuck Brandel, P.E. Improving Efficiency and Saving Money

June 4, 2009

Chuck Brandel, P.E.

Overview Why LiDAR? Analyzing Alternatives Example Project Limitations of Data Cost Savings

Why LiDAR?

Analyzing Alternatives

Example Project

Limitations of Data

Cost Savings

Why Use LiDAR on Ditch Projects?

Why Use LiDAR on Ditch Projects? Preliminary Planning Cost Estimating Watershed Delineation Initial Stormwater Modeling Earthwork Calculations Alternative Site Selection

Preliminary Planning

Cost Estimating

Watershed Delineation

Initial Stormwater Modeling

Earthwork Calculations

Alternative Site Selection

Why Use LiDAR on Ditch Projects? Can all be completed without a traditional (and expensive) topographic survey

Can all be completed without a traditional (and expensive) topographic survey

Blue Earth County Ditch 57

Shaded Relief Map from LiDAR

Color Relief Map from LiDAR

Survey Resolution - USGS

Survey Resolution - LiDAR

Alternative Treatment - Inline Storage

Alternative Treatment - Detention

Alternative Treatment - Two Stage Ditch

Alternative Treatment - Surge Pond

Alternative Treatment - Restoration

Why Use LiDAR on Ditch Projects?

Limitations of the Data Vegetated and Wooded Areas Ditch Bottoms River and Stream Interactions Tile Inlets Culvert Crossings Stream/Ditch Bank Erosion Developing Areas

Vegetated and Wooded Areas

Ditch Bottoms

River and Stream Interactions

Tile Inlets

Culvert Crossings

Stream/Ditch Bank Erosion

Developing Areas

Thank You! Chuck Brandel, P.E. chuck.brandel @ is-grp.com