Flood-Inundation Shapefiles and Grids for Lake Champlain in Vermont and New York

Dates

Publication Date: 2019-03-07
Start Date: 2017-02-15
End Date: 2018-10-15

Citation

Hayes, L., and Flynn, R.H., 2019, Flood-inundation shapefiles and grids for Lake Champlain in Vermont and New York: U.S. Geological Survey data release, https://doi.org/10.5066/P9ZBDF6S.

Summary

Static flood-inundation boundary extents were created for Lake Champlain in Franklin, Chittenden, Addison, Rutland, and Grand Isle Counties in Vermont and Clinton, Essex, and Washington Counties in New York by using recently acquired (2009, 2012, 2014, and 2015) light detection and ranging (lidar) data. The corresponding flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science website at http://water.usgs.gov/osw/flood_inundation/, depict estimates of the areal extent of flooding corresponding to selected water-level elevations (stages) at the USGS lake gage on the Richelieu River (Lake Champlain) at Rouses Point, N.Y. (station number 04295000). In this study, wind and seiche effects (standing [...]

Summary

Static flood-inundation boundary extents were created for Lake Champlain in Franklin, Chittenden, Addison, Rutland, and Grand Isle Counties in Vermont and Clinton, Essex, and Washington Counties in New York by using recently acquired (2009, 2012, 2014, and 2015) light detection and ranging (lidar) data. The corresponding flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science website at http://water.usgs.gov/osw/flood_inundation/, depict estimates of the areal extent of flooding corresponding to selected water-level elevations (stages) at the USGS lake gage on the Richelieu River (Lake Champlain) at Rouses Point, N.Y. (station number 04295000). In this study, wind and seiche effects (standing oscillating wave with a long wavelength) were not represented; therefore, the flood-inundation maps reflect 11 stages for Lake Champlain that are static for the entire area of the lake.

This dataset consists of:
A) 11 contour line shapefiles developed from the digital elevation models (DEMs) derived from the lidar to represent 11 flood stages,
B) 11 polygon shapefiles representing the estimated areal extent for 11 flood elevations created from contour lines, and
C) 11 raster files depicting the depth, in meters, of the water in the inundated areas along the approximately 600-mile shoreline (100-mile length) of Lake Champlain during 11 selected flood stages.

The depth grids were created by subtracting the DEM values (in meters) from each of 11 raster files representing the flood extent at each constant water level (in meters). The breaklines from the original lidar data were used to clip and remove areas over the lake and its tributaries, so the depth grids show the water depths only for inundated areas. Because the elevations in the lidar and DEM data were represented in meters, the depth grids are also in meters, but the contour lines and extent polygons give the water depths in feet (relative to the North American Vertical Datum of 1988).

This table shows equivalent values for each grid in feet referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29), feet referenced to the North American Vertical Datum of 1988 (NAVD 88), and meters referenced to the North American Vertical Datum of 1988 (NAVD 88):

Grid number	Feet (NGVD 29)	Feet (NAVD 88)	Meters (NAVD 88)
1	100	99.57	30.35
2	101	100.57	30.65
3	101.5	101.07	30.81
4	102	101.57	30.96
5	102.5	102.07	31.11
6	103	102.57	31.26
7	103.2	102.77	31.32
8	103.5	103.07	31.42
9	104	103.57	31.57
10	105	104.57	31.87
11	106	105.57	32.18

Contacts

Originator :: Laura Hayes, Robert H Flynn
Metadata Contact :: Laura Hayes
Publisher :: U.S. Geological Survey
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: New England Water Science Center
USGS Mission Area :: Water Resources

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LakeChamplain_Summary_metadata.xml Original FGDC Metadata	View	26.78 KB	application/fgdc+xml
LakeChamplain_Contours.7z		492.75 MB	application/x-7z-compressed
LakeChamplain_Polygons.7z		547.13 MB	application/x-7z-compressed
		1.11 GB	application/x-7z-compressed

Related External Resources

Type: Related Primary Publication

Flynn, R.H., and Hayes, L., 2019, Flood-inundation maps for Lake Champlain in Vermont and New York: U.S. Geological Survey Scientific Investigations Report 2018–5169, 14 p., https://doi.org/10.3133/sir20185169. [Supersedes USGS Scientific Investigations Report 2016–5060.]	https://doi.org/10.3133/sir20185169

Type: Mapping Application

USGS Flood Inundation Mapper (FIM)	http://water.usgs.gov/osw/flood_inundation/

Purpose

The Lake Champlain static flood-inundation maps are intended to aid residents in assessing the extent of flooding based on the stage as shown on the USGS lake gage websites and, in the case of the Richelieu River (Lake Champlain) at Rouses Point, N.Y., lake gage 04295000, as predicted by the National Weather Service. One way to address the informational gaps in flood extent is to produce a library of flood-inundation maps that are referenced to the stages recorded at the USGS lake gage. The dataset of contour lines, polygons, and depth grids demonstrates the estimated extent and depth of flooding around Lake Champlain at 11 specific water levels between 100 and 106 feet (National Geodetic Vertical Datum of 1929).

Flood-Inundation Shapefiles and Grids for Lake Champlain in Vermont and New York

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