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Groundwater Level Change 2005 - 2017 |
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summary:
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Groundwater Level Change 2005 - 2017 |
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Source Agency: DCI (2018), GWAP (2005)
Collection Agency: DCI (2016/17), GWAP
Maintenance Agency: EAD
Custodial Agency: EAD
Contact: EAD - Environment Information, Science & Outreach Management (EISOM) |
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5000 |
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[] |
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description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 7 0;"><SPAN><SPAN>Changes in the groundwater level of Abu Dhabi Emirate are closely linked to agricultural activity. Areas with a strongly declining water table coincide with the areas of highest groundwater abstraction for agricultural irrigation. The areas around Remah and Al Wagan illustrate this best. In the course of 25 years, the water level in groundwater monitoring wells has dropped by more than 50 m. The map shows the groundwater level change between 2005 and 2017. While yellow and red areas face a continued decline of groundwater levels, in blue areas a relative rise is observed. This relative rise is mainly attributed to a small reduction in agricultural activity and shut-down of well fields. Though between 2005 and 2017 the groundwater level slightly increased in these areas, an absolute drawdown prevails compared with the natural state. True rising of the water table takes place only in the vicinity of Al Ain, where losses from the water network and excessive landscape irrigation leads to rising water levels above the natural state.</SPAN></SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN>Processing Steps (DCI 2018): 648 available water level measurements from 2005 were joined with the closest of the water level measurements 16/17 that was used for the calculation of the water table. Only values with a join distance of less than 600 meters were considered further (341 remaining).The change in water level from the two measurements (2005 and 2016/17) was calculated and interpolated with topo to raster, no enforce, primary source spot.</SPAN><SPAN>The raster was classified and exported as polygon file.</SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN /></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Field Descriptions:</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>- OBJECTID:A unique, not null integer field used to uniquely identify rows in tables in a geodatabase</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>- Shape: Field which shows the stored geometry type created through ArcGIS (Point, Line, Polygon, Multipoint or Multipatch)</SPAN></SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN>- Classes: Classes from 0 to 8 according to EAD standard for GW Level Change</SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN>- Value_Min: Minimum Value of Groundwater Change in the respective Class</SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN>- Value_Max: Maximum Value of Groundwater Change in the respective Class</SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>- Shape_Length:Represents the total length of a polygon's perimeter, in the units used by the feature class' coordinate system</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>- Shape_Area:Represents the total area of a polygon, in square units of the linear distance unit used by the feature class' coordinate system</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>- RuleID: Needed for labeling purposes in represantations</SPAN></SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN /></P><P STYLE="margin:0 0 7 0;"><SPAN><SPAN>Resolution: 1024x1024m</SPAN></SPAN></P><P STYLE="margin:0 0 7 0;"><SPAN><SPAN>Data Quality: data was QC checked for consistency</SPAN></SPAN></P></DIV></DIV></DIV> |
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title:
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WaterLevelChange2005_2017 |
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tags:
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["Groundwater Level Change","2005","2017"] |
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en-US |
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150000000 |
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