PPoorrttrraannee WWwwTTWW LLLLeeeeggggeeeennnndddd LLeeggeenndd ffoorr AAqquuiiffeerr ZZoonneess ZZoonnee 33bb  Main Trunk Sewers Zone 1 11 00 11 22 33 9B Sewer Is described as that area within 1km radius of an existing or future groundwater source for public supply. 9C Sewer This zone is subdivided into the following: kkiiillloommeettrreess City Centre Sewer Dodder Valley Sewer Zone 1A should be fenced in and all activities SSwwoorrddss WWwwTTWW SSccaalllee:: 11::5500,,,000000 aatt AA11 From Dun Laoghaire that have potential to pollute should be forbidden. Tunnel Meakstown / Sewer In Zone 1B developments which would result or would be likely to result in pollution North Drainage Scheme of groundwater should be prohibited. MMaallaahhiiddee WWwwTTWW North Fringe Sewer Examples: Northern Interceptor Spreading of sewage sludge, waste disposal sites, construction of main foul sewers etc. KKiiilllbbrriiiddee PPSS / Sewer Shanganagh Trunk Sewer Zone 2 From Sutton Pumping Station This zone comprises the major resource aquifers (i.e. a yield >250m3/d) but excludes both Zone 1 and those areas where majors are overlain by thick drift cover or other impermeable confining strata. Pumping Station (Only selected features shown) Zone 3 Wastewater Treatment Works This zone comprises the minor resource aquifers but excludes zone 1 and areas where minor aquifers are overlain by thick drift or impermeable confining strata. These aquifers yield locally important quantities of water. This zone has been subdivided into: Dublin Aquifers ZZoonnee 33aa Zone 1a Zone 3a Most vulnerable to pollution Zone 1b ZZoonnee 33aa Zone 3b Least vulnerable to pollution ZZoonnee 33bb ZZoonnee 33aa Zone 2 Zone 3a Zone 4 Zone 3b This zone comprises the remaining areas, excluding zones 1, 2 and 3. Zone 4 Groundwater in this zone is not thought to be important but small domestic yields may be obtained. Protective measures are unnecessary from the groundwater point of view.

Source: ’ The Geology and Hydrogeology of Dublin with particular reference to the Location of Waste Disposal Sites’ (Creighton, Daly and Reilly, 1979).

SSuuttttoonn PPSS BBaallllllyymmuunn PPSS

ZZoonnee 33aa

LLeeiixxlliipp WWwwTTWW ZZoonnee 33bb

ZZoonnee 33aa

0 50 100 Kilometers

MMaaiiinn LLiiifftt PPSS RRiinnggsseenndd WWwwTTWW

ZZoonnee 33bb Project Greater Dublin Strategic Drainage Study Title ZZoonnee 22

ZZoonnee 22 Initial Strategy Review ZZoonnee 33bb DDuunn LLaaoogghhaaiiirree PPSS Aquifers

ZZoonnee 22

ZZoonnee 11bb Figure F 2

Issue Details

Drawn: Hauke Steinberg Project No. 074 512 001

ZZoonnee 44 ZZoonnee 11aa Checked: Jean Fenwick File Ref. 074512001Mi0234D03 Approved: Ciaran O’Keeffe

Scale: 1 : 50,000 at A1 Drawing No. Rev. ZZoonnee 44 D03 Date: 14.11.2002 0234

Notes 1. This drawing is the property of M. C. O’Sullivan & Co. Ltd. It is a confidential document and must not be copied, used, or its contents divulged without prior written consent. BBrraayy // SShhaannggaannaagghh WWwwTTWW 2. All levels are referred to Ordnance Datum, Malin Head. BBrraayy // SShhaannggaannaagghh WWwwTTWW 3. NOT TO SCALE, use figured dimensions only, if in doubt ask. 4. Ordnance Survey Ireland Licence No. EN 0005002 Copyright Government of Ireland.