85°58' 85°57' 85°56' 85°55'

85°58' 85°57' 85°56' 85°55'

39°15'

39°14'

39°13'

39°15'

39°14'

39°13'

NORTH AMERICAN VERTICAL DATUM 1988 (NAVD 88)

EXPLANATION

Flood-inundation area

Limit of study area

Low-head dam

Flow arrow—Indicates direction of water flow

U.S. Geological Survey streamgage and number

State route marker

Interstate route marker

U.S. route marker

03363900

46

31

65

03363900

Columbus NORTH NATIONAL ROAD 

NORTH INDIANAPOLIS ROAD

LOUISVILLE AND INDIANA RAILROAD

COUNTY ROAD 400N

31

31

65

46

11

11

East Fork White River

D r i f t w o o d

R i v e r

D r i f t w o o d

R i v e r

Fl

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Fl

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INDIANA

Study

area

Flood-Inundation Map for the Flatrock River at Columbus, Indiana

Corresponding to a Stage of 9.00 Feet and an Elevation of 618.74 Feet (NAVD 88)

at the U.S. Geological Survey Streamgage Number 03363900 

on the Flatrock River

By

William F. Coon

2013

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 3241

Sheet 1 of 12

Pamphlet accompanies map

Suggested citation:

Coon, W.F., 2013, Flood-inundation maps for the Flatrock River at Columbus, 

Indiana, 2012: U.S. Geological Survey Scientific Investigations Map 3241, 

12 p. pamphlet, 12 sheets.

Publishing support provided by: West Trenton Publishing Service Center

Manuscript approved for publication December 2012

For more information concerning this publication, contact:

Director, Indiana Water Science Center

U.S. Geological Survey

5957 Lakeside Blvd.

Indianapolis, IN 46278

(317) 290–3333

Or visit the Indiana Water Science Center Web site at:

http://in.water.usgs.gov/ 

This report is available at: http://pubs.usgs.gov/sim/3241/. 

Any use of trade, product, or firm names is for descriptive purposes

only and does not imply endorsement by the U.S. Government.

This and other USGS information products are available at:

http://store.usgs.gov/ 

U.S. Geological Survey, Box 25286

Denver Federal Center, Denver, CO 80225

To learn about the USGS and its information products visit

http://www.usgs.gov/ 

1-888-ASK-USGS

Prepared in cooperation with the

Indiana Department of Transporation

Projection: Indiana State Plane Eastern Zone

North American Datum of 1983 (NAD 83)

Orthophotography from Esri ArcGIS World Imagery, 2011,

available at http://goto.arcgisonline.com/maps/World_Imagery

UNCERTAINTIES AND LIMITATIONS FOR USE OF FLOOD-INUNDATION MAPS

Although the flood-inundation maps represent the boundaries of inundated areas with a distinct line, some uncertainty is associated with these maps. The flood boundaries shown were estimated based on water stages (water-surface elevations) and streamflows at selected USGS streamgages. Water-surface elevations along the stream reaches were estimated by 

steady-state hydraulic modeling, assuming unobstructed flow, and using streamflows and hydrologic conditions anticipated at the USGS streamgage(s). The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing as of March 2012. Unique meteorological factors (timing and distribution of precipitation) may 

cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations in the water-surface elevations and inundation boundaries shown. Additional areas may be flooded due to unanticipated conditions such as: changes in the streambed elevation or roughness, backwater into major tributaries along a main stem river, 

or backwater from localized debris or ice jams. The accuracy of the floodwater extent portrayed on these maps will vary with the accuracy of the digital elevation model used to simulate the land surface. Additional uncertainties and limitations pertinent to this study are described in the document accompanying this set of flood inundation map plates.

If this series of flood-inundation maps will be used in conjunction with National Weather Service (NWS) river forecasts, the user should be aware of additional uncertainties that may be inherent or factored into NWS forecast procedures. The NWS uses forecast models to estimate the quantity and timing of water flowing through selected stream reaches in the United 

States. These forecast models (1) estimate the amount of runoff generated by precipitation and snowmelt, (2) simulate the movement of floodwater as it proceeds downstream, and (3) predict the flow and stage (water-surface elevation) for the stream at a given location (AHPS forecast point) throughout the forecast period (every 6 hours and 3 to 5 days out in many 

locations). For more information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf.

DISCLAIMER

Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal 

purposes. The USGS provides these maps “as-is” for a quick reference, emergency planning 

tool but assumes no legal liability or responsibility resulting from the use of this information.