20260305
16145000
1.0
FALSE
AnnualChance
0.000
253983.083100
738787.340800
4470174.773700
4818433.305700
1
002
Projected
GCS_NAD_1983_2011
NAD_1983_2011_StatePlane_Iowa_North_FIPS_1401_Ft_US
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Linear Unit: Foot_US (0.304801)
20260305
16384700
20260305
16384700
FGDC CSDGM Metadata
150000000
5000
FGDC
20260305
ArcGIS Metadata
1.0
None
Click on links provided.
withheld
Iowa Department of Natural Resources
309 Trowbridge Hall
Iowa City
IA
52242
casey.kohrt@dnr.iowa.gov
US
Iowa Department of Natural Resources
https://programs.iowadnr.gov/geospatial/rest/services/SurfaceWaters/
Geospatial Web Services
The "FloodRiskXXXyr" links are the floodplain services.
Enterprise Geodatabase Feature Class
10.2
zip
Web Service
none
Floodplain Boundary
2017-03-01T00:00:00
Iowa Department of Natural Resources
309 Trowbridge Hall
Iowa City
IA
52242
chris.kahle@dnr.iowa.gov
US
319-335-1583
Iowa Department of Natural Resources
Chris Kahle, Project Manager
Iowa Department of Natural Resources
309 Trowbridge Hall
Iowa City
IA
52242
vector digital data
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Floodplain Mapping/Redelineation study deliverables depict and quantify the flood risks for the study area. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The Floodplain Mapping/Redelineation flood risk boundaries are derived from the engineering information Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA).</SPAN></P></DIV></DIV></DIV>
The objective of the Floodplain Mapping/Redelineation data submission is to archive the flood boundary and redelineation data for a study in a database such that it can be revised and used with minimum effort in future flood insurance studies or map revisions. This digital data is produced for the purposes of updating/creating a DFIRM database.
Iowa
FEMA NFIP Topic Category
Riverine Flooding
Base Flood Elevation
Floodplain Mapping
Floodway
Flood Hazard
ISO 19115 Topic Category
environment
inlandwaters
hydrology
environment
inlandWaters
elevation
floodplains
Iowa
No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Acknowledgement of the Iowa DNR and the Iowa Flood Center would be appreciated in products derived from these data. This digital data is produced for the purposes of updating/creating a DFIRM database.</SPAN></P></DIV></DIV></DIV>
FEMA CASE UNKNOWN
2014-06-19
Federal Emergency Management Agency
-93.964228
-92.005663
41.150478
42.521121
Esri ArcGIS 13.6.0.59527
Iowa Department of Natural Resources provided funding and project management, and staffing for this project.
Iowa Flood Center, IIHR, University of Iowa, provided staffing and oversight for this project.
The dates of this data correspond to the date of publication of this data
2017-03-01T00:00:00
1
-96.041930
-90.047343
43.518836
40.345873
When FEMA revises an FIS, adjacent studies are checked to ensure agreement between flood elevations at the boundaries. Likewise flood elevations at the confluence of streams studied independently are checked to ensure agreement at the confluence. The FIRM and the FIS are developed together and care is taken to ensure that the elevations and other features shown on the flood profiles in the FIS agree with the information shown on the FIRM. However, the elevations as shown on the FIRM are rounded whole-foot elevations. They must be shown so that a profile recreated from the elevations on the FIRM will match the FIS profiles within one half of one foot.
Data contained in the Floodplain Mapping and Redelineation files reflect the content of the source materials. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. With new mapping, FEMA plans to maintain full detail in the spatial data it produces. However, older information is often transferred from existing maps where some generalization has taken place. Flood risk data are developed for communities participating in the NFIP for use in insurance rating and for floodplain management. Flood hazard areas are determined using statistical analyses of records of river flow, storm tides, and rainfall; information obtained through consultation with the communities; floodplain topographic surveys; and hydrological and hydraulic analysis. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied.
Floodplain Mapping and Redelineation datasets are compiled in conjunction with the hardcopy FIRM and the final FIS report. The specifics of the hydrologic and hydraulic analyses performed are detailed in the FIS report. The results of these studies are submitted in digital format to FEMA. These data and unrevised data from effective FIRMs are compiled onto the base map used for DFIRM publication and checked for accuracy and compliance with FEMA standards.
8888-08-08
This dataset represents the boundary of that flood interval only. It is not a regulatory tool, therefore there are no attributes associated with this information.
AnnualChance
Feature Class
0
OBJECTID
OBJECTID_1
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
AnnChance
AnnChance
SmallInteger
2
5
0
GaugeEquiv
GaugeEquiv
Double
8
38
8
Shape
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
dataset
EPSG
8.2.10(10.3.1)
0
Simple
FALSE
0
TRUE
FALSE
Iowa Department of Natural Resources
Geospatial Administrator
300 Trowbridge Hall
Iowa City
IA
52242
casey.kohrt@dnr.iowa.gov
US
319-335-1353
State of Iowa Enterprise Classification Standard