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Navtech
has performed hydrology surveys in
a variety of situations:
- Stream
Surveys and Classification
- Watershed
Modeling and Analysis
- Sediment
and Erosion Analysis
- Channel
and Wetland Restoration Design
- Stormwater
Management
- Water
Monitoring Plan Development
and Implementation
- Wetland
Delineation
- Runoff
and Erosion control designs
for industrial facilities
- Highway
culverts and bridge design
studies
- Federal
Watershed Analyses
- Mine
Closure/reclamation projects
- Flood
Damage assessments
- Surface
hydrology monitoring
- Shoreline
Position Surveys
- Baseline
of Wetland Conditions
- Preparation
for Dredging
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NavTech
performs hydrographic surveys
using GPS as a primary positioning
system. The GPS is coupled with a
digital fathometer to collect the
depth of the water. The depth is
collected each second in a regular
pattern and stored with a GPS
position and time tag. The depths
are corrected for the draft of the
boat, tidal variation, river
stage, and speed of sound in
water. The depths are subtracted
from the surface elevation to
produce elevations on the bottom
of the survey area. The elevations
are then used to produce a
bathymetric contour map.