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The Soil Agricultural Groundwater Banking Index (SAGBI) is a suitability index for groundwater
recharge on agricultural land. The SAGBI is based on five major factors that are critical to successful
agricultural groundwater banking: deep percolation, root zone residence time, topography, chemical
limitations, and soil surface condition.
There are two versions of the SAGBI: Unmodified and Modified. The Unmodified layer shows
suitability using soil data as mapped by the USDA-NRCS Soil Survey Geographic Database
(SSURGO). The Modified layer is a hypothetical layer that assumes that all soils with restrictive layers
have been modified by deep tillage, thereby increasing their permeability.
More details about the SAGBI can be found in the article in California Agriculture located at
http://calag.ucanr.edu/archive/?article=ca.v069n02p75 |
| summary:
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The Soil Agricultural Groundwater Banking Index (SAGBI) is a suitability index for groundwater
recharge on agricultural land. The SAGBI is based on five major factors that are critical to successful
agricultural groundwater banking: deep percolation, root zone residence time, topography, chemical
limitations, and soil surface condition.
There are two versions of the SAGBI: Unmodified and Modified. The Unmodified layer shows
suitability using soil data as mapped by the USDA-NRCS Soil Survey Geographic Database
(SSURGO). The Modified layer is a hypothetical layer that assumes that all soils with restrictive layers
have been modified by deep tillage, thereby increasing their permeability.
More details about the SAGBI can be found in the article in California Agriculture located at
http://calag.ucanr.edu/archive/?article=ca.v069n02p75 |
| extent:
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[[-122.360714999953,38.0201002553747],[-120.463283679285,39.3906368204831]] |
| accessInformation:
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O'Geen A, Saal M, Dahlke H, Doll D, Elkins R, Fulton A, Fogg G, Harter T, Hopmans J,Ingels C, Niederholzer F, Sandoval Solis S, Verdegaal P, Walkinshaw M. 2015. Soil suitability indexidentifies potential areas for groundwater banking on agricultural lands. Calif Agr 69(2):75-84.Available online at http://calag.ucanr.edu/archive/?article=ca.v069n02p75 |
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| typeKeywords:
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["Data","Service","Map Service","ArcGIS Server"] |
| description:
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<div style='text-align:Left;'><div><div><p><span><span>Groundwater pumping chronically exceeds natural recharge in many agricultural regions in California.</span></span></p><p><span><span>A common method of recharging groundwater — when surface water is available — is to deliberately</span></span></p><p><span><span>flood an open area, allowing water to percolate into an aquifer. However, open land suitable for this</span></span></p><p><span><span>type of recharge is scarce. Flooding agricultural land during fallow or dormant periods has the potential</span></span></p><p><span><span>to increase groundwater recharge substantially, but this approach has not been well studied. Using data</span></span></p><p><span><span>on soils, topography and crop type, we developed a spatially explicit index of the suitability for</span></span></p><p><span><span>groundwater recharge of land in all agricultural regions in California.</span></span></p><p><span style='font-weight:bold;'><span>Date: </span></span><span><span>2015</span></span></p><p style='font-weight:bold;'><span><span>Point of Contact:</span></span></p><p><span><span>Toby O’Geen</span></span></p><p><span><span>Professor & Soil Resource Specialist in Cooperative Extension</span></span></p><p><span><span>Dept. of Land, Air and Water Resources, UC Davis</span></span></p><p><span><span>atogeen@ucdavis.edu</span></span></p><p><span><span>530-752-2155</span></span></p><p style='font-weight:bold;'><span><span>Field Definitions:</span></span></p><p><span><span>areasymbol </span></span><span style='font-style:italic;'><span>– </span></span><span><span>symbol representing the SSURGO survey area</span></span></p><p><span><span>spatialver – number used to denote the serial version of the SSURGO spatial data for a soil survey</span></span></p><p><span><span>musym – symbol used to identify the soil map unit in the SSURGO soil survey</span></span></p><p><span><span>mukey – string used to uniquely identify the SSURGO map unit</span></span></p><p><span><span>mukey_num – same as mukey field, but in numeric format</span></span></p><p><span><span>acres – area in acres of the mapped polygon</span></span></p><p><span><span>mukey_1 – duplicate of mukey field</span></span></p><p><span><span>cokey – string used to identify the dominant component of the SSURGO map unit</span></span></p><p><span><span>deep_perc – suitability score (0-100) for the deep percolation SAGBI factor</span></span></p><p><span><span>rt_zn_res_ – suitability score (0-100) for the root zone residence time SAGBI factor</span></span></p><p><span><span>toxicity – suitability score (0-100) for the toxicity SAGBI factor</span></span></p><p><span><span>topo_rest – suitability score (0-100) for the topographic restrictions SAGBI factor</span></span></p><p><span><span>surf_cond – suitability score (0-100) for the surface condition SAGBI factor</span></span></p><p><span><span>restrictns – description of the dominant component’s restrictive layers</span></span></p><p><span><span>sagbi – overall SAGBI suitability score (0-100)</span></span></p><p><span><span>rat_grp – rating group associated with the SAGBI score</span></span></p><p><span><span>slope_l – slope gradient (low value) of the dominant component</span></span></p><p><span><span>slope_h – slope gradient (high value) of the dominant component</span></span></p><p><span><span>compname – name of the dominant soil component</span></span></p><p><span><span>taxsubgrp – the taxonomic subgroup of the dominant component</span></span></p><p style='font-weight:bold;'><span><span>Suggested Symbology:</span></span></p><p><span><span>SAGBI Score Rating Group RGB values</span></span></p><p><span><span>85 – 100 Excellent 38, 115, 0</span></span></p><p><span><span>69 - 85 Good 152, 230, 0</span></span></p><p><span><span>49 - 69 Moderately Good 255, 255, 0</span></span></p><p><span><span>29 - 49 Moderately Poor 255, 170, 0</span></span></p><p><span><span>15 - 29 Poor 255, 85, 0</span></span></p><p style='margin:0 0 0 0;'><span style='font-size:16pt'><span>0 - 15 Very Poor 168, 0, 0</span></span></p></div></div></div> |
| licenseInfo:
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<div style='text-align:Left;'><p><span style='font-size:16pt'><span>Please contact Toby O’Geen prior to use.</span></span></p></div> |
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| title:
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SAGBI_mod |
| type:
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Map Service |
| url:
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| tags:
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["SAGBI","Groundwater","Soil","Index","Agriculture"] |
| culture:
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en-US |
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SAGBI_mod |
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NAD_1983_StatePlane_California_II_FIPS_0402_Feet |