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Shass Mountain Peat Landslide

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Shass Mountain Peat Landslide SHASS MOUNTAIN PEAT LANDSLIDE Factual Report MGE0780RP0001 Shass Mountain Peat Landslide Factual Report F01 16th October 2020 rpsgroup.com FACTUAL REPORT Document status Version Purpose of document Authored by Reviewed by Approved by Review date Various F01 Factual Report WM GC 16/10/2020 (JOC and GMcE) Approval for issue Gareth McElhinney 16 October 2020 © Copyright RPS Group Limited. All rights reserved. The report has been prepared for the exclusive use of our client and unless otherwise agreed in writing by RPS Group Limited no other party may use, make use of or rely on the contents of this report. The report has been compiled using the resources agreed with the client and in accordance with the scope of work agreed with the client. No liability is accepted by RPS Group Limited for any use of this report, other than the purpose for which it was prepared. RPS Group Limited accepts no responsibility for any documents or information supplied to RPS Group Limited by others and no legal liability arising from the use by others of opinions or data contained in this report. It is expressly stated that no independent verification of any documents or information supplied by others has been made. RPS Group Limited has used reasonable skill, care and diligence in compiling this report and no warranty is provided as to the report’s accuracy. No part of this report may be copied or reproduced, by any means, without the written permission of RPS Group Limited. Prepared by: Prepared for: RPS Working Group under Ministers Supervision Lyrr 2, Department of Culture, Heritage and the Gaeltacht, IDA Business & Technology Park, 23 Kildare Street, Dublin, D02 TD30 Mervue Galway, H91 H9CK MGE0780RP0001 | Shass Mountain Peat Landslide Factual Report | F01 | rpsgroup.com Page i FACTUAL REPORT Contents 1 INTRODUCTION ...................................................................................................................................... 1 1.1 Overview ........................................................................................................................................ 1 1.2 Developments on Shass Mountain, 1995 to Present .....................................................................2 2 THE SHASS MOUNTAIN PEAT LANDSLIDE EVENT ...........................................................................3 2.1 Description of the Landslide and Lands Affected ..........................................................................3 2.2 Estimated Areas and Volumes ....................................................................................................... 5 2.3 Consultations with Relevant Bodies ............................................................................................... 6 3 PEAT LANDSLIDES ................................................................................................................................ 8 3.1 Types of Peat Landslides ............................................................................................................... 8 3.2 Historical Peat Slide Events ........................................................................................................... 9 4 WEATHER DATA .................................................................................................................................. 12 4.1 Weather Forecast Prior to the Event ............................................................................................ 12 4.2 Weather Information Sources ...................................................................................................... 12 4.3 Met Éireann Weather Observing Stations ....................................................................................12 4.4 Third-Party Weather Observing Stations .....................................................................................12 4.5 Weather Observing Stations Summary ........................................................................................13 5 CATCHMENT CHARACTERISTICS ..................................................................................................... 15 5.1 Review of Available Information ................................................................................................... 15 5.1.1 General ........................................................................................................................... 15 5.1.2 Bedrock ........................................................................................................................... 15 5.1.3 Soils ................................................................................................................................ 15 5.1.4 Environment .................................................................................................................... 15 5.1.5 Landslide Susceptibility ..................................................................................................16 5.2 Surveys Undertaken Post-event .................................................................................................. 16 5.3 Peat .............................................................................................................................................. 16 5.4 Forestry ........................................................................................................................................ 17 5.5 Protected Sites ............................................................................................................................. 17 6 IMPACT ON THE AQUATIC ENVIRONMENT AND LANDS ...............................................................22 6.1 Catchment Overview .................................................................................................................... 22 6.2 Pre-event Water Quality ............................................................................................................... 22 6.3 Leitrim County Council Water Quality Chemistry Data ................................................................24 6.4 Diffagher River Fisheries Data ..................................................................................................... 25 6.5 Lough Allen .................................................................................................................................. 25 6.5.1 Water Quality .................................................................................................................. 25 6.5.2 Fish ................................................................................................................................. 25 6.5.3 Protected Aquatic Species and Habitats ........................................................................26 th 6.6 Field Survey 14 September 2020 ..............................................................................................26 6.6.1 Downstream of Dawn of Hope Bridge ............................................................................26 6.6.2 Upstream of Dawn of Hope Bridge .................................................................................28 6.6.3 Flood Plain at Corcormick ...............................................................................................28 6.6.4 Flood Plain at Corchuill Lower and Derrindangan (north of R200) ................................. 28 6.7 Impact on Land, Property and Infrastructure ...............................................................................28 6.7.1 Impact on Land ...............................................................................................................28 6.7.2 Impact on Property .........................................................................................................31 6.7.3 Impact on Infrastructure ..................................................................................................31 7 RISK ASSESSMENT ............................................................................................................................. 32 7.1 Introduction .................................................................................................................................. 32 7.2 Methodology ................................................................................................................................. 32 7.3 Areas ............................................................................................................................................ 32 MGE0780RP0001 | Shass Mountain Peat Landslide Factual Report | F01 | rpsgroup.com Page ii FACTUAL REPORT 7.3.1 Area A ............................................................................................................................. 32 7.3.2 Area B ............................................................................................................................. 32 7.4 Risk to Land, Property and Infrastructure ....................................................................................36 7.5 Risk to Life.................................................................................................................................... 36 8 REMEDIAL WORKS .............................................................................................................................. 37 8.1 Emergency Works ........................................................................................................................ 37 8.2 Remedial Measures to be Completed in the Short Term .............................................................38
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