Input for constructing metadata for data set irr1986_20101011.shp.

This data set differs from irr1986_20101004.shp only in that Row 37 Column 13 irrigated lands were removed, to correspond to a change in model boundary. The following metadata input are unchanged:

This data set is a repair of data set irr86_20100629.shp. That data set was constructed from ESPAM2_irr86_4_22_10.shp. Changes in irr86_20100629.shp were to correct blunders that occurred in transferring IESW031 and IESW041 lands to IESW000.

irr1986_20101004.shp differs from irr86_20100629.shp only in the fact that missing polygons in the area of Jerome County immediately above the canyon rim have been restored.

1)  Purpose of data: Approximation of location of irrigated lands, for calibration of ESPAM2 aquifer model.

2)  Input data:

a)  Geometry of irrigated parcels: Raster data set “p3940r2930_irrpatch_fill2.img” obtained from IDWR in January 2009. This is a classification of LANDSAT imagery done by Bill Kramber of IDWR, based on Normalized Difference Vegetative Index.

b)  Masking of wetlands and urban/industrial areas: ESPAM1.1 wetlands data, obtained in part from Data set “srbas91lu.shp” obtained from IDWR circa 2001 and in part from place-of-use plygons from Adjudication review of Camas Wildlife Refuge, obtained from Craig Saxton of IDWR 2002. Original projection was IDTM, reprojected to IDTM83 using ArcView3.3 projection extension.

c)  Source of irrigation water and probable GW supply fraction: Data set “ESPAM2_wtr_src_for_modl_03_06_09.shp.”

d)  Entity & polygon boundaries: “ESPAM2_sw_entities_04_21_09.shp” and “ESPAM2_gw_polygons_04_25_09.shp.” The latter file has not been posted. It is essentially unchanged from the GW polygons used in ESPAM1.1.

3)  Date of “on-the-ground” condition:

a)  Geometry of irrigated parcels: 1986

b)  Masking of wetlands and urban/industrial areas: 1992

c)  Source of irrigation water: Basic data circa 2002 w/ some updates 2008

d)  Probable GW supply fraction: 2008

e)  SW polygons: 2009

f)  GW polygons: 2002

4)  Horizontal resolution/accuracy:

a)  Geometry of irrigated parcels appears to be based on 30-meter pixels.

b)  Masking of wetlands: See metadata for srbas91lu.shp.

c)  Source of irrigation water: Based on quarter-quarter (approximately 0.25 miles square) public land survey information, in some cases interpolated to 400-meter regular grid.

d)  Probably GW supply fraction: Based on proximity to GIS location of irrigation wells in 2008 water right data set. Some wells are GPS located +/- 10-30 meters. Some are located by quarter section or quarter-quarter section legal description of point of diversion. Proximities based on 100 meter and 1000 meter search radii.

e)  SW polygons: IDWR maps of water right place of use and irrigation-company service areas, in some cases interpolated to nearest 400-meter regular grid polygons. In non-irrigated areas boundaries are arbitrary.

f)  GW polygons: Heads-up digitized from scanned paper maps of depth-to-groundwater from RASA study, combined with entity boundaries for Mud Lake and A & B Irrigation District areas. Expected horizontal resolution ranges from a few hundred to a few thousand meters.

5)  Projection and extent. Projection is IDTM83. Spatial extent may be obtained by opening the data set in GIS.

6)  Updates schedule: No updates planned for geometry. Supply fractions will be adjusted as part of data-set preparation and perhaps again during calibration.

Data processing steps:
An older 1986 irrigated lands data set was located that still had the parcels that were missing in irr86_20100629.shp. GIS polygons were merged by water source, to obliterate the former subdivisions into entities and water source, which have been superceded by more recent work. The new simplified data set was processed as follows:

  1. Intersect with data set base_entity_source_20100610.shp, downloaded from:
    http://www.idwr.idaho.gov/Browse/WaterInfo/ESPAM/model_files/Version_2.0_Development/Current_Data/ESPAM2_Irrigated_Lands_20100629/Data_for_processing_irrigated_lands/
  1. Create and populate Entity and Src_Frac fields.
  1. Export all mixed source parcels and populate Entity and Src_Frac fields for overlapping mixed-source polygons.
  1. Merge the overlapping mixed-source polygons with the original data set.
  1. Populate the net_acrs field.

The result is that for each groundwater-only parcel, there is a single GIS polygon with no overlaps. For each surface-water-only parcel, there is likewise a single GIS polygon with no overlaps. For each mixed-source parcel, there is a pair of identical, 100% overlapping GIS polygons. One has Entity equal to Gw_polgy and one has Entity equal to Sw_ent.

Data fields are:

  1. Shape: ESRI-generated field
  2. Gw_polyg: Name of the groundwater polygon (irrigation entity) the parcel lies within, regardless of actual water source.
  3. Modl_src: Source of water to be used for modeling purposes. For most entities this is the actual water source. Possible entries are "GW" (groundwater), "SW" (surface water) or "Mixed" (both water rights are present).
  4. Sw_ent: Name of the surface-water irrigation entity the parcel lies within, regardless of actual water source.
  5. Row_id: The row number of the MODFLOW model grid cell the parcel lies within. Values range from one to 104.
  6. Col_id: The column number of the MODFLOW model grid cell the parcel lies within. Values range from one to 209
  7. Cell_intgr: An integer cell identification number, used for joining to GIS. Its format is 1<RRR<CCC>. For instance, 1045112 is row 45 column 112.
  8. Cellid: A string cell identification number. It is identical to a string representation of Cell_intgr, with the leading "1" replaced by "SP" (Snake Plain).
  9. Rnd2_frac: This is the fraction of supply to be represented as coming from groundwater, for modeling purposes, for mixed-source parcels. In many cases it will differ from our expectation of the true fraction of supply from groundwater. This was done to allow the On-Farm algorithm of MKMOD software produce an appropriate water budget in locations where true mixed-source irrigation is practiced and surface-water supplies are temporally variable.
  10. Entity: This is the irrigation entity to be used in modeling.
  11. Src_frac: This is the fraction of supply to be used in modeling, from the source of the entity identified in field Entity. For single-source parcels its value is 1.00. For the groundwater half of a mixed-source pair its value is equal to Rnd2_frac and for the surface-water half its values is equal to (1 - Rnd2_frac).
  12. Net_acrs: This is the effective acreage the parcel represents in the model input. It is equal to GIS acreage times Src_frac. MKMOD will apply (Net_acrs) * (1 - RED) in model calculations. RED is the reduction for non-irrigated inclusions and it is supplied to MKMOD in a separate file.

1