A river’s contours are a mystery until they’re mapped. Even then, the river moves and changes with high flows and debris. Lakes, though less changeable, are unknowable without depth mapping. This presentation will provide an overview of river and lake hydrography projects done by the Minnesota Department of Transportation Bridge Hydraulics-Waterways group.
MnDOT’s Bridge Hydraulics/Waterways group has mapped rivers and lakes for 16 years with survey-grade depth-sounders and an Acoustic Doppler Current Profiler (ADCP). Depths, flow rate, velocity and direction are measured, mapped in ArcGIS and CADD and applied to project requirements. Challenged by floods and low water alike, our equipment has been adapted to a wide variety of waterways, and we’ll share that experience. Recently, we acquired a 3D sonar scanner device and will discuss what we have done to date and some exciting prospects for the future.
Petra DeWall is the Waterways Engineer for MnDOT. She attended The University of Minnesota where she received her Bachelors degree in Civil Engineering and a Masters degree in Infrastructure Systems Engineering. Petra heads up the Waterway Unit in Hydraulics which issues hydraulic reports on all new bridge projects, manages the scour program and works with the local units of government assisting with technical guidance on hydraulic and scour issues. When not in the office, Petra likes to go camping with her husband Craig and son Bobby.
Meeting Schedule and Logistics:
Social time and lunch
(if you so desire) will be from 11:30 AM to
12:30 PM in the dining
room of the Officers Club.
- The Club’s cafeteria-style lunches
are typically $10.00 or less; people who
partake in the cafeteria-style lunch
will pay the Officers Club directly.
If you come only for the presentations,
there is no charge.
Post Meeting and
Presentation will be from
12:30 PM to about
1:15 PM in the
Lower-Level Meeting Room of the Officers Club.
1-PDH for this Presentation.
Please RSVP with your intent to either
partake in the cafeteria-style lunch or to
come for the presentation only; this will
help the Officers Club staff to ensure that
an adequate amount of food is prepared.
Either leave a voice mail message with
Michelle Larson at 651-290-5632, or click
the RSVP button in the left-hand column, or
send an email message to
Fort Snelling Officer's Club near Post Road.
See map at: http://www.same-msp.org/_images/934thOfficersClub.jpg