Latitude: 36.843600° N,
Longitude: 76.364700° W,
Horizontal Datum:
NAD83
River Stage Reference Frame |
Gauge Height |
Flood Stage |
Uses |
NWS stage |
0 ft |
5 ft |
Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps |
Vertical Datum |
Elevation (gauge height = 0) |
Elevation (gauge height = flood stage) |
Elevation information source |
NAVD88 |
-1.78 |
3.22 |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
NGVD 29 |
-0.909 |
4.091 |
Older USGS topographic maps, NGVD29 benchmarks |
MSL |
-1.483 |
3.517 |
Older USGS topographic maps, MSL benchmarks |
Other |
-3.025 |
1.975 |
Conversion to MHHW |
|