To provide a measure of eomparability, the 
published 2008 U.S. level data were adjusted to 
inelude the hortieulture operations’ data. See 
Appendix A, Statistieal Methodology for a detailed 
diseussion of data eomparability. 
WATER RESOURCES REGIONS MAP 
The map on page 1 shows Water Resourees Regions 
delineated to approximate aetual basin boundaries 
based on topographie drainage eharaeteristies. Data 
are tabulated separately for eaeh of the 20 Water 
Resourees Regions shown on the map. 
PERCENT OF NORMAL PRECIPITATION 
MAPS 
The maps on pages 2 through 5 show the areas of the 
U.S. with deviations from normal preeipitation 
during 2013. The maps are ineluded for referenee 
purposes only. 
TABLES AND APPENDICES 
The FRIS tables are divided into three seetions: 
Entire Farm, Crops Grown in the Open and Pasture, 
and Hortieultural Operations. 
Entire Farm Data Tables. Table 1 shows farms 
and aeres irrigated for the 1997 through 2012 
Censuses of Agrieulture for eaeh State. Tables 2 
through 27 present detailed irrigation data eolleeted 
in the farm and raneh irrigation survey from 
operations that reported irrigated land in the 2012 
eensus and also in the 2013 survey. Exeluded from 
these data are institutional, researeh, and 
experimental operations. Table 27 presents data for 
farm operations that irrigated in 2012 but 
diseontinued irrigation either temporarily or 
permanently in 2013 while eontinuing to operate a 
farm or raneh. Comparable adjusted 2008 U.S. level 
survey data are also presented in some tables. Data 
are reported at the national level, for eaeh State, and 
for the 20 Water Resourees Regions. 
Crops Grown in the Open and Pasture Data 
Tables. Tables 28 through 39 present detailed 2013 
irrigation data eolleeted on erops grown in the open 
and pasture. Exeluded from these data are 
VI Introduction 
institutional, researeh, and experimental operations, 
and water use and area of erops grown under 
proteetion. Data are reported at the national level and 
for eaeh State. 
Horticultural Operations Data Tables. Tables 40 
through 45 present detailed 2013 irrigation data 
eolleeted on hortieultural erops grown under 
proteetion. Data are from hortieultural operations 
that reported irrigating in the 2012 eensus and also in 
the 2013 survey. Data are reported at the national 
level and for eaeh State. 
Appendix A. Provides information about data 
eolleetion and data proeessing aetivities and 
diseusses the statistieal methodology used in 
eondueting and evaluating the survey. Table A 
provides the general 2013 FRIS sample eounts and 
the sample’s eorresponding 2012 eensus irrigated 
aereage. It also provides the general 2013 FRIS 
unexpanded and expanded aeres irrigated and 2012 
eensus aeres irrigated. Table B provides a 
eomparison of the irrigated aeres published in the 
2012 Census of Agrieulture and expanded 2013 
FRIS aeres irrigated by size group. Table C provides 
the standard error for seleeted data for irrigated erops 
grown in the open in 2013. Table D provides the 
standard error for seleeted hortieultural data in 2013. 
Appendix B. Provides information about the 
development of the report form. It also eontains the 
definitions of speeifie terms and phrases used in this 
publieation, ineluding items in the publieation tables 
that earry the note “see text.” The faesimiles of the 
report form and the instruetion sheet used to eolleet 
the FRIS data are ineluded. Table A provides 
irrigated aereage and rank for the previous three 
eensuses. 
RESPONDENT CONFIDENTIALITY 
In keeping with the provisions of Title 7 of the 
United States Code, no data are published that would 
diselose information about the operations of an 
individual farm or raneh. All tabulated data are 
subjeeted to an extensive diselosure review prior to 
publieation. Any tabulated item that identifies data 
reported by a respondent or allows a respondent’s 
data to be aeeurately estimated or derived, was 
suppressed and eoded with a ‘D’. However, the 
number of farms reporting an item is not eonsidered 
2012 Census of Agriculture 
USDA, National Agricultural Statistics Service 
