| snippet:
|
An aquifer is an underground body of water bearing rock or unconsolidated materials (gravel or sand) from which groundwater can be extracted in useful amounts.
There are two main types of aquifer in Ireland – bedrock aquifers, and sand and gravel aquifers (<5%) .
In bedrock aquifers the groundwater is stored in and travels through fractures, joints and other weaknesses in the rock.
In sand and gravel aquifers groundwater is stored and flows between the sand and gravel grains.
Different aquifers have differing abilities to store and transmit water. GSI aquifer categories can be used to define the relative value of aquifers in Ireland.
GSI Aquifer classes are divided into three main groups based on their resource potential, and further subdivided based on the type of openings through which groundwater flows. There are nine aquifer categories in total. |
| summary:
|
An aquifer is an underground body of water bearing rock or unconsolidated materials (gravel or sand) from which groundwater can be extracted in useful amounts.
There are two main types of aquifer in Ireland – bedrock aquifers, and sand and gravel aquifers (<5%) .
In bedrock aquifers the groundwater is stored in and travels through fractures, joints and other weaknesses in the rock.
In sand and gravel aquifers groundwater is stored and flows between the sand and gravel grains.
Different aquifers have differing abilities to store and transmit water. GSI aquifer categories can be used to define the relative value of aquifers in Ireland.
GSI Aquifer classes are divided into three main groups based on their resource potential, and further subdivided based on the type of openings through which groundwater flows. There are nine aquifer categories in total. |
| accessInformation:
|
Contains Irish Public Sector Data (Geological Survey) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence |
| thumbnail:
|
|
| maxScale:
|
5000 |
| typeKeywords:
|
[] |
| 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 >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> |
| licenseInfo:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Data that is produced directly by the Geological Survey Ireland (GSI) is free for use under the conditions of Creative Commons Attribution 4.0 International license. </SPAN></P><P><SPAN>https://creativecommons.org/licenses/by/4.0/legalcode</SPAN></P><P><SPAN>Under the CC-BY Licence, users must acknowledge the source of the Information in their product or application. </SPAN></P><P><SPAN>Please use this specific attribution statement: "Contains Irish Public Sector Data (Geological Survey) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence". </SPAN></P></DIV></DIV></DIV> |
| catalogPath:
|
|
| title:
|
GEO_GSI_AquiferSandAndGravel_Ply_PC1 |
| type:
|
|
| url:
|
|
| tags:
|
["Sand","gravel","Aquifer","Rg","Lg","Water","Framework","Directive","WFD","Groundwater","GSI","Geological","Survey","Ireland","Geology","Hydrogeology"] |
| culture:
|
en-US |
| portalUrl:
|
|
| name:
|
|
| guid:
|
|
| minScale:
|
500000 |
| spatialReference:
|
|