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EIMS SUMMARY REPORT
Entry ID:  1747 Version:  1.0
Title:  WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2)
Abstract:  
Wetlands make important contributions to the health of aquatic systems on a watershed basis by purifying water, filtering runoff, abating floods, and decreasing erosion. In addition, wetlands provide habitat for countless numbers of plants and animals including over 40% of all federally listed threatened or endangered species. Many wetland plants and animals support recreation and commercial industries. For example, wetlands act as nurseries for over 80% of coastal fisheries. In addition, millions of Americans are annually drawn to wetlands for bird watching, hunting, fishing, and enjoying the natural beauty of wetland ecosystems. Although wetland loss rates are slowing, the United States continues to lose approximately 70,000 to 90,000 acres of wetlands on non-federal, rural lands each year. Description of the Data Layer Recent wetlands loss rates (Map 7a, Natural Resources Inventory (NRI), 1982-1992) were combined with historic loss rates (Map 7b, National Wetlands Inventory (NWI), 1780s-1980s) to form an index. The combined index is a more robust indicator of watershed condition than either loss rate used independently. Natural Resources Inventory. Natural Resources Conservation Service (NRCS) reports on wetland acreage on rural, non-federal lands that constitute about 75% of the Nations land base. (Reported at 6-digit accounting unit) National Wetlands Inventory. The U.S. Fish and Wildlife Service maintains wetlands acreage data on federal and non-federal lands. (State level) To create the Wetlands Loss Index, The IWI assigned the appropriate NWI State data to Accounting Units and combined it with NRI data. The following chart was used to assign scores (0 = low level of wetland loss, 1 = moderate level of wetland loss, and 2 = high level of wetland loss) (IWI version 1.2) (IWI) Version 1.0
Citation:  WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) .
Additional Information:  Plans to Improve this Data Layer1. U.S. EPA is working towards reporting on both the quantity and quality of wetlands. However, wetland biological monitoring programs are still in their infancy. As States establish wetland monitoring programs and include this information in their 305(b) reports, better data will be available for this data layer. 2. U.S. EPA is continuing to work with the USFWS and NRCS to monitor wetland loss and report improvements in wetland acreage. The Federal Geographic Data Committee Wetlands Subcommittee is exploring new approaches of tracking wetland acreage, reporting more frequently, and reporting at the 8-digit watershed level.
DOWNLOADS / URL LINKS 8 Files found
1)   File Name:   SCORE07.ZIP
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) IWI SCORE ZIPPED DATA FILES.
File Type:   DBF
Application Version:  
File Size (KB):   5
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
2)   File Name:   IWI07A.GIF
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) NATIONAL MAP.
File Type:   GIF
Application Version:  
File Size (KB):   36
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
3)   File Name:   IWI07.GIF
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) NATIONAL MAP.
File Type:   GIF
Application Version:  
File Size (KB):   34
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
4)   File Name:   IWI07B.GIF
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) NATIONAL MAP.
File Type:   GIF
Application Version:  
File Size (KB):   34
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
5)   File Name:   DATA07.TXT
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) ZIPPED DATA FILES.
File Type:   TXT
Application Version:  
File Size (KB):   110
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
6)   File Name:   DICT07.WPD
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) DATA DICTIONARY
File Type:   WPD
Application Version:  
File Size (KB):   10
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
7)   File Name:   DBACK07.WPD
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) DATA LAYER DESCRIPTION. (FACT SHEET)
File Type:   WPD
Application Version:  
File Size (KB):   38
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
8)   File Name:   PROF07.WPD
File Description:   WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2) DATA DICTIONARY PROFILES.
File Type:   WPD
Application Version:  
File Size (KB):   18
File Date:  
Compression Status:  
EIMS Certification:  
Connection Type:  
  
CONTACTS 1 Contact found
Name:  SUSAN FAGAN
Role:  DEP
Primary Phone:  2025661302 Alternate Phone:  
Mobile Phone:   Pager:  
Fax:  
Primary Email:  fagan.susan@epa.gov
Alternate Email:  fagan.susan@epamail.epa.gov
RELATED ENTRIES 1 Related Entry found
1)   Related Entry ID:   1748 Version:  1.0
Information Type:  DATA SET
Title:  WETLAND LOSS MEASURED BY NATIONAL WETLANDS INVENTORY 1780-1980S (IWI VERSION 1.2) (IWI) VERSION 1.0
Relationship Reason:  DATA SET FOR 1780 - 1980S
Administrative Details
ADMINISTRATIVE DETAILS
Entry ID:  1747 Version:  1.0
Title:  WETLAND LOSS INDEX 1982-1992; 1780-1980 (IWI VERSION 1.2)
Information Type:  DATA SET Information Subtype:  
Entry Date:  25-AUG-97 Revision Date:  20-NOV-03
Release Date:  25-AUG-97 Review Date:  
Sunset Date:   Retire Date:  
Status:  PENDING
EIMS Partner:  SURF YOUR WATERSHED (OW-SURF)
Collections:  GENERAL, SCIENCE INVENTORY
DEP:  SUSAN FAGAN
Availability:  PUBLIC
Access Procedures:  
No access procedures specified.
Access Restrictions:  
No specific access restrictions are recorded.
OBJECTIVES 0 Objectives found
METHODS 0 Methods found
QUALITY ASSURANCE
Data Use / Constraints:  DATA SUFFICIENCY THRESHOLD ALL AVAILABLE DATA WERE USED.NOTES ON INTERPRETING THIS INFORMATION DATA NEED TO BE MUCH MORE CONSISTENT/MUCH ADDITIONAL DATA NEEDEDSEE COMMENTS FOR ADDTIONAL INFORMATION
KEYWORDS 2 Keywords found
Hierachical Keywords
1)   Topic:  BIOSPHERE
Term:  FLORA
Keyword:  WETLANDS
2)   Topic:  HYDROSPHERE
Term:  SURFACE WATER
Keyword:  WETLANDS
Free Form Keywords
(none)
GEOGRAPHIC AREA
Bounding Coordinates   (Latitude and Longitude measured in decimal degrees)
Northern Boundary:   49 Southern Boundary:   25
Eastern Boundary:   125 Western Boundary:   67
Geopolitical Areas
State:   County:   Municipality:  
Watershed Areas
Hydrologic Unit Code:  
Region:  
Subregion:  
Accounting Unit:  
Catalog Unit:  
Watershed:  
Subwatershed:  
DATA ELEMENTS 7 Data Elements found
1)   Data Element:   CU
Max Length:   8
Decimal Digits:  
Description:   U.S. Geological Survey Hydrologic Cataloging Unit Code
Data Type:   NUMBER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   10
        Decimal Digits:  
        Low Range:  
        High Range:  
2)   Data Element:   ACCT_UNIT
Max Length:   8
Decimal Digits:  
Description:   U.S. Geological Survey accounting unit code
Data Type:   CHARACTER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   8
        Decimal Digits:  
        Low Range:  
        High Range:  
3)   Data Element:   PERC_HIS
Max Length:   9
Decimal Digits:   2
Description:   Percent historic (1780s-1980s) wetland loss
Data Type:   NUMBER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   9
        Decimal Digits:   2
        Low Range:  
        High Range:  
4)   Data Element:   NRI_PERC_C
Max Length:   8
Decimal Digits:   2
Description:   Percent change of wetland area between 1982 and 1992
Data Type:   NUMBER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   8
        Decimal Digits:   2
        Low Range:  
        High Range:  
5)   Data Element:   PROB_GR0PC
Max Length:   8
Decimal Digits:   2
Description:   Probability of the accounting unit having a net gain (<0% loss) of wetlands over the 10-year period
Data Type:   NUMBER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   8
        Decimal Digits:   2
        Low Range:  
        High Range:  
6)   Data Element:   PROB_0PC
Max Length:   8
Decimal Digits:   2
Description:   probability of the accounting unit having no loss or gain (0% loss) of wetlands over the 10-year period
Data Type:   NUMBER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   8
        Decimal Digits:   2
        Low Range:  
        High Range:  
7)   Data Element:   PROB2PC
Max Length:   8
Decimal Digits:   2
Description:   Probability of the accounting unit having lost 2% of wetlands over the 10-year period
Data Type:   NUMBER
Low Range:  
High Range:  
Low Range Reason:  
    Reported Information
        Max Length:   8
        Decimal Digits:   2
        Low Range:  
        High Range:  
REFERENCES 2 References found
4)   Natural Resources Inventory (NRI), 1982 and 1992
5)   National Wetlands Inventory (NWI), 1780s-1980s
ACRONYMS 0 Acronyms found
Acronym: Meaning:

 
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Last updated on Saturday , November 23, 2002
http://oaspub.epa.gov:80/eims_pub/direntrpt.report