Abstract:

What is a Subsidence Incident? Sinkholes are closed depressions in areas underlain by soluble rock such as limestone, dolostone, gypsum, or salt. Sinkholes form when surface sediments subside into underground voids created by the dissolving action of groundwater in the underlying bedrock. Other subterranean events can cause holes, depressions or subsidence of the land surface that may mimic sinkhole activity. These include subsurface expansive clay or organic layers which compress as water is removed, collapsed or broken sewer and drain pipes or broken septic tanks, improperly compacted soil after excavation work, and even buried trash, logs and other debris. Commonly, a reported depression is not verified by a licensed professional geologist to be a true sinkhole, and the cause of subsidence is not known. Such an event is called a subsidence incident. The Florida Geological Survey maintains and provides a downloadable database of reported subsidence incidents statewide. While this data may include some true sinkholes, the majority of the incidents have not been field-checked and the cause of subsidence is not verified. This dataset is an update to the sir_jun18 layer.

Purpose:

To map the occurence and spatial distribution of subsidence incidents in Florida.

Currentness_Reference:

publication date

Use_Constraints:

Important - Please contact FGS at 850-617-0301 for more information prior
to using the sinkhole data.

Subsidence Incident Reports Disclaimer: 
This geologic data was developed by the Florida Department of Environmental 
Protection (FDEP) - Florida Geological Survey (FGS) to carry out agency 
responsibilities related to management, protection, and development of 
Florida's natural resources. Although efforts have been made to make 
the information accurate and useful, the FDEP/FGS assumes no responsibility 
for errors in the information and does not guarantee that the data are free from 
errors or inaccuracies. Similarly FDEP/FGS assumes no responsibility for the 
consequences of inappropriate uses or interpretations of the data. As such, 
these digital data are distributed on an "as is" basis and the user assumes 
all risk as to their quality, the results obtained from their use, and the performance 
of the data. FDEP/FGS bears no responsibility to inform users of any changes 
made to this data. The data in this database was obtained from a variety of 
sources. Subsidence incident records listed in this database, in many instances, 
have not been field checked or verified by FDEP/FGS professional geologists. 
Additionally, the locations of many of these subsidence incidents have not been
verified. As such, anyone using this data is advised that precision implied by the 
data may far exceed actual precision. Comments on this data are invited and 
FDEP/FGS would appreciate that documented errors be brought to staff attention. 
The development of these data sets represents a major investment of staff time 
and effort. As a professional responsibility, we expect that the FDEP/FGS will
receive proper credit when you utilize these data sets. Further, since part of this
data was developed and collected with U.S. Government or State of Florida 
funding, no proprietary rights may be attached to it in whole or in part, nor may 
it be sold to the U.S. Government or the Florida State Government as part of any
procurement of products or services.

Address:

3000 Commonwealth Blvd., Suite 1

Data_Set_Credit:

FDEP, Florida Geological Survey

Attribute_Accuracy_Report:

GeoPlan relied on the integrity of the attribute information within
the original data.

Logical_Consistency_Report:

This data is provided 'as is'. GeoPlan relied on the integrity
of the original data layer's topology

Completeness_Report:

This data is provided 'as is' by GeoPlan and is complete to our
knowledge.

Horizontal_Positional_Accuracy_Report:

This data is provided 'as is' and its horizontal positional accuracy
has not been verified by GeoPlan

Vertical_Positional_Accuracy_Report:

This data is provided 'as is' and its vertical positional accuracy
has not been verified by GeoPlan

Source_Contribution:

Spatial and Attribute Information

Process_Description:

Data added in the GIS library and will be updated monthly.

Address:

2600 Blair Stone Rd MS 6520

Process_Description:

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The GeoPlan Center took the following steps during the QA/QC process:
- Downloaded the dataset from FDEP on 7/8/2019 using this link:
  https://publicfiles.dep.state.fl.us/otis/gis/data/
- Dataset from the FDEP website was originally downloaded in a file
  geodatabase and in NAD_1983_HARN_Florida_GDL_Albers.
- Define Projection tool was used to alter the projection information to 
  conform with FGDL's standardized projection
- DESCRIPT field added and calculated using "SIR REFERENCE
  NUMBER" and the REF_NUM field. Any records with no data
  in the REF_NUM field had their DESCRIPT field calculated
  as 'NO DESCRIPT AVAILABLE'
- FGDLAQDATE field added based on the date the dataset was downloaded
  from the source.
- The longest record for each field was calculated and field character
  lengths were shortened to the appropriate shortest length possible.
- Uppercased fields and records in the dataset.
- Layer name changed from FGS_SUBSIDENCE_INCIDENTS to
  sir_jun19.shp. The naming convention for the layer was based on 
  the time period of content. In this case, the time period of content 
  was based on the most recent entry in the EVENT_DATE field (06/20/2019). 


Note:
Because the dataset was downloaded in a file geodatabase format,
and datasets are updated as shapefiles, field names were
truncated or changed. Below is a list of field name changes:

Reference Number --> REF_NUM
Date Revised --> DATE_REV
Date of Reported Event --> DATE_ADD
Verified Sinkhole --> TRUE_SINK
Longitude Decimal Degrees --> LONGDD
Latitude Decimal Degrees --> LATDD
County --> COUNTY
PLSS Township --> TWNSHP
Township Cardinal Direction --> TWNSHP_D
PLSS Range --> RANGE
Range Cardinal Direction --> RANGE_D
PLSS Sections --> SECTION
Quarter Section 1 --> QTRSECT1
Quarter Section 2 --> QTRSECT2
Accuracy --> ACCURACY
Source of Report --> RPT_SOURCE
Owner's City --> OCITY
Owner's Zip Code --> OZIP
Dimensions --> SIZDIM
Shape --> SINSHAPE
Length (ft) --> SINLNGTH
Width (ft) --> SINWIDTH
Depth (ft) --> SINDEPTH
Slope of Sides --> SLOPE
Water Visible --> WATSIN
Water Below Land Surface (ft) --> WATBLS
Limestone Visible --> LIMVIS
Cave Visible --> CAVVIS
Subsidence Rate --> SUBRATE
Property Damage --> PROPDAM
Repair Status --> REPAIR_S
Drainage Structures Present --> DRAINSTR
Soil Type --> SOILTYPE
Comments --> COMMENTS
Additional Comments --> COMMENTS_2
DOCUMENT_LINK --> DOC_LINK

Attribute_Definition:

Internal feature number.