Parent Layer: Land and Soil

Name: Aquifer Sand and Gravel

Display Field: GRAVELBODY

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This dataset comprises sand and gravel aquifers. Sand and gravel aquifers may be locally important (Lg) or regionally important (Rg). Rg - A sand/gravel aquifer is classed as regionally important if it can supply regionally important abstractions (e.g. large public water supplies with </SPAN></SPAN><SPAN><SPAN>‘</SPAN></SPAN><SPAN><SPAN>excellent</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>yields &gt;400 m3/d). It is highly permeable, more than 10 m thick or has a saturated thickness of at least 5 m, and should extend over at least 5 km2, and usually over 10 km2. Lg - Locally Important Sand/Gravel Aquifer: Similar to a Regionally Important Sand/Gravel Aquifer (Rg), but with a smaller continuous area (c.1-10 km2) and/or less consistent permeability. Although the aquifer may supply </SPAN></SPAN><SPAN><SPAN>‘</SPAN></SPAN><SPAN><SPAN>excellent</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>yields, the smaller size limits the amount of recharge available to meet abstractions. Sand/gravel deposits have a dual role in groundwater development and supply. Firstly, in some cases they can supply significant quantities of water for supply and are therefore classed as aquifers, and secondly, they provide storage for underlying bedrock aquifers. A sand/gravel deposit is classed as an aquifer if the deposit is highly permeable, more than 10 m thick and greater than one square kilometre in aerial extent. The thickness of the deposit is often used rather than the more relevant saturated zone thickness as the information on the latter is rarely available. In many instances it may be assumed that a deposit with a thickness of 10 m will have a saturated zone of at least 5 m. This is not the case where deposits have a high relief (for example eskers or deposits in high topographic areas) as these gravels are often dry.</SPAN></SPAN></P></DIV></DIV></DIV>

Service Item Id: 0f691b33aefc4f82aae14c378b1c83a5

Copyright Text: Contains Irish Public Sector Data (Geological Survey) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

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Max Scale: 0.0

Effective Min Scale: 1000000

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

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Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -789253.9983122377
YMin: 6957061.806792256
XMax: -723757.6254357499
YMax: 7065308.450782859
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: AQ_DESC
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: Locally important gravel aquifer
  Label: Locally important gravel aquifer
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [255, 127, 127, 255]
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• Value: Regionally important gravel aquifer
  Label: Regionally important gravel aquifer
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Labeling Info:

Advanced Query Capabilities:

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Supports Sql Expression: true
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Supports Percentile Statistics: true
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HasZ: false

HasM: false

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HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• GRAVELBODY ( type: esriFieldTypeString, alias: GRAVELBODY, length: 50 )
• AQUIFER ( type: esriFieldTypeString, alias: AQUIFER, length: 20 )
• AREA_KM ( type: esriFieldTypeDouble, alias: AREA_KM )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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