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14245900
1.0
Item Description
FALSE
WaterLevelChange2005_2017
002
51.573451
56.017398
22.631621
24.911248
1
Geographic
GCS_WGS_1984
Angular Unit: Degree (0.017453)
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20190630
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20190630
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ItemDescription
Version 6.2 (Build 9200) ; Esri ArcGIS 10.4.1.5686
WaterLevelChange2005_2017
1
51.573451
56.017398
24.911248
22.631621
Groundwater Level Change 2005 - 2017
<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>
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)
Groundwater Level Change
2005
2017
File Geodatabase Feature Class
dataset
EPSG
6.14(3.0.1)
9
Simple
FALSE
9
TRUE
FALSE
WaterLevelChange2005_2017
Feature Class
9
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
Classes
Classes
SmallInteger
2
0
0
Value_Min
Value_Min
Double
8
0
0
Value_Max
Value_Max
Double
8
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape_Area
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
RuleID
RuleID
Integer
4
0
0
Override
Override
Blob
0
0
0
20190630