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Groundwater pumping chronically exceeds natural recharge in many agricultural regions in California.
A common method of recharging groundwater — when surface water is available — is to deliberately
flood an open area, allowing water to percolate into an aquifer. However, open land suitable for this
type of recharge is scarce. Flooding agricultural land during fallow or dormant periods has the potential
to increase groundwater recharge substantially, but this approach has not been well studied. Using data
on soils, topography and crop type, we developed a spatially explicit index of the suitability for
groundwater recharge of land in all agricultural regions in California.
Date: 2015
Point of Contact:
Toby O’Geen
Professor & Soil Resource Specialist in Cooperative Extension
Dept. of Land, Air and Water Resources, UC Davis
atogeen@ucdavis.edu
530-752-2155
Field Definitions:
areasymbol – symbol representing the SSURGO survey area
spatialver – number used to denote the serial version of the SSURGO spatial data for a soil survey
musym – symbol used to identify the soil map unit in the SSURGO soil survey
mukey – string used to uniquely identify the SSURGO map unit
mukey_num – same as mukey field, but in numeric format
acres – area in acres of the mapped polygon
mukey_1 – duplicate of mukey field
cokey – string used to identify the dominant component of the SSURGO map unit
deep_perc – suitability score (0-100) for the deep percolation SAGBI factor
rt_zn_res_ – suitability score (0-100) for the root zone residence time SAGBI factor
toxicity – suitability score (0-100) for the toxicity SAGBI factor
topo_rest – suitability score (0-100) for the topographic restrictions SAGBI factor
surf_cond – suitability score (0-100) for the surface condition SAGBI factor
restrictns – description of the dominant component’s restrictive layers
sagbi – overall SAGBI suitability score (0-100)
rat_grp – rating group associated with the SAGBI score
slope_l – slope gradient (low value) of the dominant component
slope_h – slope gradient (high value) of the dominant component
compname – name of the dominant soil component
taxsubgrp – the taxonomic subgroup of the dominant component
Suggested Symbology:
SAGBI Score Rating Group RGB values
85 – 100 Excellent 38, 115, 0
69 - 85 Good 152, 230, 0
49 - 69 Moderately Good 255, 255, 0
29 - 49 Moderately Poor 255, 170, 0
15 - 29 Poor 255, 85, 0
0 - 15 Very Poor 168, 0, 0
Groundwater pumping chronically exceeds natural recharge in many agricultural regions in California.
A common method of recharging groundwater — when surface water is available — is to deliberately
flood an open area, allowing water to percolate into an aquifer. However, open land suitable for this
type of recharge is scarce. Flooding agricultural land during fallow or dormant periods has the potential
to increase groundwater recharge substantially, but this approach has not been well studied. Using data
on soils, topography and crop type, we developed a spatially explicit index of the suitability for
groundwater recharge of land in all agricultural regions in California.
Date: 2015
Point of Contact:
Toby O’Geen
Professor & Soil Resource Specialist in Cooperative Extension
Dept. of Land, Air and Water Resources, UC Davis
atogeen@ucdavis.edu
530-752-2155
Field Definitions:
areasymbol – symbol representing the SSURGO survey area
spatialver – number used to denote the serial version of the SSURGO spatial data for a soil survey
musym – symbol used to identify the soil map unit in the SSURGO soil survey
mukey – string used to uniquely identify the SSURGO map unit
mukey_num – same as mukey field, but in numeric format
acres – area in acres of the mapped polygon
mukey_1 – duplicate of mukey field
cokey – string used to identify the dominant component of the SSURGO map unit
deep_perc – suitability score (0-100) for the deep percolation SAGBI factor
rt_zn_res_ – suitability score (0-100) for the root zone residence time SAGBI factor
toxicity – suitability score (0-100) for the toxicity SAGBI factor
topo_rest – suitability score (0-100) for the topographic restrictions SAGBI factor
surf_cond – suitability score (0-100) for the surface condition SAGBI factor
restrictns – description of the dominant component’s restrictive layers
sagbi – overall SAGBI suitability score (0-100)
rat_grp – rating group associated with the SAGBI score
slope_l – slope gradient (low value) of the dominant component
slope_h – slope gradient (high value) of the dominant component
compname – name of the dominant soil component
taxsubgrp – the taxonomic subgroup of the dominant component
Suggested Symbology:
SAGBI Score Rating Group RGB values
85 – 100 Excellent 38, 115, 0
69 - 85 Good 152, 230, 0
49 - 69 Moderately Good 255, 255, 0
29 - 49 Moderately Poor 255, 170, 0
15 - 29 Poor 255, 85, 0
0 - 15 Very Poor 168, 0, 0