• Excess/Insufficient Water

Potential At-Risk Maps and Information

The following are the potential at-risk maps produced during the Arkansas Resource Assessment - Phase I. The NRCS definition of the natural resource concern and the input layers and land use designation weights that were used for modeling each of the natural resource concerns within the Excess/Insufficient Water Resource Concern are listed to the right of each map. More detailed maps are available by clicking the link below each map. None of the natural resource concerns under the Excess/Insufficient Resource Concern were selected for Priority Area designation at this time.



Excess and or Insufficient Water, Ponding, Flooding, etc...
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Ponding, Flooding, Seasonal High Water Table,
seeps and drifted snow


    NRCS Definition:
        Surface water or poor subsurface drainage restricts land use and
        
management  goals. Wind-blown snow accumulates around and over
        surface structures, restricting access to humans and animals.

    Land Use Designation Weights:
        Crop (Weight 3); Pasture (Weight 2);
        Forest, Range, Urban and Assoc. Ag (Weight 1); Water (Weight 0)

    Binary Input Layers and Associated Weights:
        – SSURGO Flooding Frequency     Frequently Flooded,
                                                           Long or Very Long Duration (Weight 2)
        – SSURGO Depth To Water Table <=15, April-June (Weight 1)
        – SSURGO Ponding Frequency     Frequent, for long or
                                                           very long duration (Weight 1)
        – SSURGO Land Capability Subclass w (Weight 2)



Inefficient Use of Irrigation Water

    NRCS Definition:
        Irrigation water is not stored, delivered, scheduled, or applied efficiently.
        Aquifer or surface water withdrawals threaten sustained availability of
        ground or surface  water. Available irrigation water supplies have been
        reduced due to aquifer  depletion, competition, regulation, drought, or
        some combination of these.

    Land Use Designation Weights:
        Crop (Weight 1); Pasture, Forest, Range,
        Urban, Assoc. Ag and Water (Weight 0)

    Binary Input Layers and Associated Weights:
        – SSURGO Depth To Water Table <=15, April-June (Weight 1)
     
    Classified Input Layers and Associated Weights:
          –   10-Year Change in Groundwater by 12-digit HUC5,
            where change is negative. (Weight 1)

            -0.46 – -5.81 (Weight 1)

            -7.24 – -13.35 (Weight 2)

            -53.84 (Weight 3)
       
        
– Acres of Irrigated Ag Land by County
            < 1,000 (Weight 0)
            1,000 – 99,999 (Weight 1)
            100,000 – 199,999 (Weight 2)
            > 200,000 (Weight 3)
        – Total Acrefeet of Groundwater Used for Irrigation by 8-digit HUC8
            < 1,000 (Weight 0)
            1,000 – 99,999 (Weight 1)
            100,000 – 350,000 (Weight 2)
            > 350,000 (Weight 3)



Inefficient Moisture Management

    NRCS Definition:
        Natural precipitation is not optimally managed to support desired land use
        goals or ecological processes.

    Land Use Designation Weights:
        Crop, Pasture, Forest, Range, Urban,
        Assoc. Ag (Weight 1); Water (Weight 0)

    Binary Input Layers and Associated Weights:
        – SSURGO Available Water Capacity <= 10 (AWC-100cm) (Weight 1)
        – SSURGO Surface Texture S, LS, SL (Weight 1)
        – SSURGO Ksat >= 14 (Weight 1)
        – SSURGO Depth to Restrictive Layer <= 51 (Weight 1)
        – SSURGO Hydrologic Groups A and B (Weight 1)
        – SSURGO Drainage Class,
                          Excessively/Somewhat Excessively Drained (Weight 1)
                            
ċ
ExcessInefficientWater_At-RiskandPriorityMaps.zip
(2586k)
Hanna Ford,
Oct 5, 2011, 8:25 PM
Ċ
Hanna Ford,
Dec 2, 2011, 6:33 AM
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