Pesticide Leaching Classes of Illinois SoilsEntry ID: IGDNR_PESTLEACH
Abstract: This data set was designed for statewide evaluation of
agrichemical leaching characteristics. It was created to
classify soils and aquifer settings according to predictions
of leaching potential. The classifications have not been
validated by the results of water quality sampling.
This is a statewide Arc/Info data set of soil characteristics
relating to ... pesticide leaching. It was generated to aid in
determining aquifer sensitivity to pesticide leaching in Illinois.
The source map was digitized at 1:250,000, but was developed from
source data mapped at 1:15,000. The publication of this map was at
1:500,000. Nominal scale is 1:250,000.
Two statewide data sets were identified as containing
information that would be useful for producing aquifer
sensitivity maps: a soil association map (and database)
and a map of geologic materials to a depth of 50 feet
(Stack-unit map). The soil association map and database
were used in an interpretive mapping model that generated
a map of nitrate leaching classes by evaluating factors that
relate to water movement characteristics of the soil.
This pesticide data set was created by combining the nitrate
map interpretations with information on the distribution of
organic matter. (Pesticides are organic compounds that tend
to adsorb to soil organic matter, and so have their movement
in soil water retarded.)
The result is six pesticide leaching classes that group soil
associations based on the relative probability of pesticide movement
through the associated soil profiles. The ranking is qualitative,
and is based on the median leaching value of the soil map units
that comprise each soil association.
Pesticide leaching classes include: Excessive, High,
Moderate, Somewhat Limited, Limited, and Very Limited. See ISGS
EG 148 for the derivation of these classes.
To provide a measure of leaching class variability within each
association, leaching class range values were calculated. To
reduce the impact of extreme leaching class values on this
estimate, the the range values were trimmed so that the upper
and lower 10% of values were not included in the calculation.
These trimmed range values were used as an overprint on the
published map of pesticide leaching classes (see cross reference
Disturbed land and surface water areas are also shown.
These data are to be used in conjunction with ISGS Environmental
Geology report 148. This data set is one of a suite of six
related data sets (listed below). Full citation details are
available in the Cross References section.
Aquifer Sensitivity to Contamination by Nitrate Leaching in Illinois
Nitrate Leaching Classes of Illinois Soils
Nitrate Leaching Class Ranges
Aquifer Sensitivity to Contamination by Pesticide Leaching in Illinois
Pesticide Leaching Classes of Illinois Soils (this data set)
Pesticide Leaching Class Ranges
This coverage includes county lines. These lines are not directly
relevant to the data, but are necessary for technical reasons.
Without the additional county lines, some of the polygons exceed
the maximum allowable vertex limit in ARCPLOT. This problem is
solved by the additional county lines, which serve to divide polygons
with too many vertices into smaller units. Accordingly, to remove
the county lines from maps created with ARCPLOT, the DROPLINE
command must be used on conjunction with the COUNT-FED-FIPS
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use Constraints None
Data Set Progress
Distribution Format: To be determined
Fees: Please See Summary
Role: DIF AUTHOR
Email: ncdc.metadata at noaa.gov
151 Patton Avenue Room 468
Province or State: North Carolina
Postal Code: 28801-5001
Creation and Review Dates
DIF Creation Date: 2006-06-27
Last DIF Revision Date: 2011-07-21