Lower Neuadd Reservoir was created by an embankment dam constructed in 1884 in what has since become the Brecon Beacons National Park. The dam and spillway have exhibited a long history of concerns surrounding their integrity. The deteriorating spillway channel, faulty scour valve, and the leakage through the core with associated settlement of the embankment dam reached a point where remediation was not reasonably practical. The chosen solution was discontinuance by excavating a notch through the embankment dam. Obtaining permission to alter listed structures within a national park required detailed environmental assessments and negotiation with the authorities. Construction was complicated by a mountainous catchment that created significant flows at low return periods that could fill the empty reservoir basin in hours and overtop the works.
{"title":"Discontinuance of Lower Neuadd Reservoir","authors":"D. Neeve, V. Stoyanova, B. Cotter, J. Clewer","doi":"10.1680/jdare.22.00086","DOIUrl":"https://doi.org/10.1680/jdare.22.00086","url":null,"abstract":"Lower Neuadd Reservoir was created by an embankment dam constructed in 1884 in what has since become the Brecon Beacons National Park. The dam and spillway have exhibited a long history of concerns surrounding their integrity. The deteriorating spillway channel, faulty scour valve, and the leakage through the core with associated settlement of the embankment dam reached a point where remediation was not reasonably practical. The chosen solution was discontinuance by excavating a notch through the embankment dam. Obtaining permission to alter listed structures within a national park required detailed environmental assessments and negotiation with the authorities. Construction was complicated by a mountainous catchment that created significant flows at low return periods that could fill the empty reservoir basin in hours and overtop the works.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44361813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The dynamic behaviour of a concrete gravity dam-impounded water-sediment-foundation system is very complex under seismic loading condition. This study is focussed on the investigation of the effects of variations in the material properties of a dam monolith and foundation bed, the consideration of with and without–slip conditions at the dam-foundation interface, and the variation in slope of sediment bed on the seismic behaviour of a concrete gravity dam. A finite element model of the Koyna dam has been developed in the computer software ABAQUS to investigate the dam-reservoir-sediment-foundation interaction behaviour. The Koyna earthquake excitations in both horizontal and vertical directions of the dam have been used as the input data for the dynamic analysis. The main parameters investigated are contact pressure, friction shear stress at dam heel, heel stresses, crest displacement and accelerations, and tension damage. The findings of this numerical study are also compared with the results predicted from the models proposed by Westergaard and Darbre using the added mass concept for the reservoir effect.
{"title":"Seismic analysis of a concrete gravity dam considering dam-water-sediment-foundation interaction","authors":"Ranjit Kumar Srivastava, D. Sahoo","doi":"10.1680/jdare.22.00111","DOIUrl":"https://doi.org/10.1680/jdare.22.00111","url":null,"abstract":"The dynamic behaviour of a concrete gravity dam-impounded water-sediment-foundation system is very complex under seismic loading condition. This study is focussed on the investigation of the effects of variations in the material properties of a dam monolith and foundation bed, the consideration of with and without–slip conditions at the dam-foundation interface, and the variation in slope of sediment bed on the seismic behaviour of a concrete gravity dam. A finite element model of the Koyna dam has been developed in the computer software ABAQUS to investigate the dam-reservoir-sediment-foundation interaction behaviour. The Koyna earthquake excitations in both horizontal and vertical directions of the dam have been used as the input data for the dynamic analysis. The main parameters investigated are contact pressure, friction shear stress at dam heel, heel stresses, crest displacement and accelerations, and tension damage. The findings of this numerical study are also compared with the results predicted from the models proposed by Westergaard and Darbre using the added mass concept for the reservoir effect.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49430015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1680/jdare.2022.32.3.93
{"title":"Editorial: The British Dam Society Prize","authors":"","doi":"10.1680/jdare.2022.32.3.93","DOIUrl":"https://doi.org/10.1680/jdare.2022.32.3.93","url":null,"abstract":"","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46720830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elton Reservoir was built between 1804 and 1808 to supply water to the Manchester, Bolton and Bury Canal. The canal is no longer open for boat traffic, but the reservoir does provide a sweetening flow. The reservoir is retained by a 600m long embankment dam with a maximum height of 8.8 metres, has a capacity of 923,000 m3 and a surface area of 22 hectares. Top Water Level in the reservoir is 87.70 m AOD. The Canal & River Trust (the Trust) is the reservoir owner. The reservoir has experienced a number of embankment slips in the past with the most recent being in 2012. The water level was subsequently reduced until repair works could be undertaken. A length of unlined spillway channel along the toe of the embankment suffering from erosion was repaired at the same time. The opportunity was taken to complete other remedial works including making the operation of the scour valve within the confined space of the outlet tunnel less onerous. This paper outlines the investigation works undertaken and the various options considered with respect to repairing the slip and providing embankment stabilisation, which led to the preferred solution of counterfort drains.
埃尔顿水库建于1804年至1808年间，为曼彻斯特、博尔顿和伯里运河供水。运河不再对船只开放，但水库确实提供了一种甜味流。该水库由一座600米长、最大高度8.8米、库容923000立方米、表面积22公顷的堤坝拦挡。水库最高水位为87.70 m AOD。运河与河流信托（以下简称“信托”）是水库所有者。该水库过去曾经历过多次堤防滑坡，最近一次是在2012年。水位随后降低，直到可以进行修复工程。同时修复了沿堤脚遭受侵蚀的一段无衬砌溢洪道。借此机会完成了其他补救工程，包括减少出口隧洞密闭空间内冲刷阀的操作。本文概述了所进行的调查工作以及在修复滑坡和提供路堤稳定方面所考虑的各种方案，这导致了扶壁排水沟的首选解决方案。
{"title":"Elton Reservoir Slip","authors":"M. Coombs, Nathan Povey, David H. Brown","doi":"10.1680/jdare.22.00088","DOIUrl":"https://doi.org/10.1680/jdare.22.00088","url":null,"abstract":"Elton Reservoir was built between 1804 and 1808 to supply water to the Manchester, Bolton and Bury Canal. The canal is no longer open for boat traffic, but the reservoir does provide a sweetening flow. The reservoir is retained by a 600m long embankment dam with a maximum height of 8.8 metres, has a capacity of 923,000 m3 and a surface area of 22 hectares. Top Water Level in the reservoir is 87.70 m AOD. The Canal & River Trust (the Trust) is the reservoir owner. The reservoir has experienced a number of embankment slips in the past with the most recent being in 2012. The water level was subsequently reduced until repair works could be undertaken. A length of unlined spillway channel along the toe of the embankment suffering from erosion was repaired at the same time. The opportunity was taken to complete other remedial works including making the operation of the scour valve within the confined space of the outlet tunnel less onerous. This paper outlines the investigation works undertaken and the various options considered with respect to repairing the slip and providing embankment stabilisation, which led to the preferred solution of counterfort drains.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43519828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Environment Agency first developed a specification for recording incidents at reservoirs and undertaking investigations in 2006. The system provided the means for any serious incident to be reported on a voluntary basis, recorded in a central database and investigated if appropriate. In 2013, incident reporting became mandatory for statutory reservoirs located in England and Wales. This paper considers the success of mandatory reporting based on information available for incidents at English reservoirs. Statistics on the rate of reporting by major reservoir undertakers are presented together with data on incident reporters by role. The paper raises concern regarding the likely completeness of reporting of incidents at statutory reservoirs in England and the challenges of identifying incidents that occur at non-statutory reservoirs. Considering recommendations in the UK government's independent review of reservoir safety in 2021, the paper explores the future challenges that will be faced in ensuring the reservoir industry effectively documents and learns from UK reservoir incidents.
{"title":"The mandatory reporting of reservoir incidents in England","authors":"A. Warren","doi":"10.1680/jdare.22.00090","DOIUrl":"https://doi.org/10.1680/jdare.22.00090","url":null,"abstract":"The Environment Agency first developed a specification for recording incidents at reservoirs and undertaking investigations in 2006. The system provided the means for any serious incident to be reported on a voluntary basis, recorded in a central database and investigated if appropriate. In 2013, incident reporting became mandatory for statutory reservoirs located in England and Wales. This paper considers the success of mandatory reporting based on information available for incidents at English reservoirs. Statistics on the rate of reporting by major reservoir undertakers are presented together with data on incident reporters by role. The paper raises concern regarding the likely completeness of reporting of incidents at statutory reservoirs in England and the challenges of identifying incidents that occur at non-statutory reservoirs. Considering recommendations in the UK government's independent review of reservoir safety in 2021, the paper explores the future challenges that will be faced in ensuring the reservoir industry effectively documents and learns from UK reservoir incidents.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41471464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Discussion: Flood plans in England (Dams & Reservoirs Issue 32(1))","authors":"J. Benn","doi":"10.1680/jdare.22.00502","DOIUrl":"https://doi.org/10.1680/jdare.22.00502","url":null,"abstract":"","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48819644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Discussion: Detailing of flood detention reservoirs for resilience","authors":"P. Perry","doi":"10.1680/jdare.22.00501","DOIUrl":"https://doi.org/10.1680/jdare.22.00501","url":null,"abstract":"","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46796185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jen Sampson, T. Hewitt, Paul Lambert, Jasvir Malia
This paper describes the investigations undertaken at Balgray Reservoir after concerns were raised regarding the condition of the heavily encrusted original cast iron pipework which dates from 1853. Testing of the thickness and hardness of a section of the pipe as well as testing of the encrustation was used to determine the materials present. The results of these investigations were used to determine the implications for the condition of the pipe and the resulting risks posed to the dam. This informed the potential options for the required remediation works. Details are provided for the case study, the investigations and findings and potential options for encrustation removal.
{"title":"Balgray Reservoir: Outlet Pipework Condition Assessment and Rehabilitation","authors":"Jen Sampson, T. Hewitt, Paul Lambert, Jasvir Malia","doi":"10.1680/jdare.22.00091","DOIUrl":"https://doi.org/10.1680/jdare.22.00091","url":null,"abstract":"This paper describes the investigations undertaken at Balgray Reservoir after concerns were raised regarding the condition of the heavily encrusted original cast iron pipework which dates from 1853. Testing of the thickness and hardness of a section of the pipe as well as testing of the encrustation was used to determine the materials present. The results of these investigations were used to determine the implications for the condition of the pipe and the resulting risks posed to the dam. This informed the potential options for the required remediation works. Details are provided for the case study, the investigations and findings and potential options for encrustation removal.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43715881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AECOM investigated potential ice loading at Scottish Water's concrete dams above 200 mAOD top water level. Ice can exert a load on a dam by a variety of mechanisms including: thermal expansion, impact / wind drag, vertical force and water level changes. A simplified method was applied to estimate ice thicknesses at the dams. Stability analyses based on thermal expansion forces indicated that ice loading could be a risk to the stability of concrete and masonry dams that are less than 5 m to 10 m high. However, the virtual absence of reported incidents where ice has caused damage to dams (and none in UK) suggest the problem is not as acute as this analysis suggests. A consideration of site-specific factors can identify the likelihood of ice loading developing, the potential consequences of damage and whether intervention could be made in good time or whether permanent measures are warranted.
{"title":"Ice Loading at Scottish Water's Reservoirs","authors":"Mark Biesta, R. Mann, T. Judge","doi":"10.1680/jdare.22.00092","DOIUrl":"https://doi.org/10.1680/jdare.22.00092","url":null,"abstract":"AECOM investigated potential ice loading at Scottish Water's concrete dams above 200 mAOD top water level. Ice can exert a load on a dam by a variety of mechanisms including: thermal expansion, impact / wind drag, vertical force and water level changes. A simplified method was applied to estimate ice thicknesses at the dams. Stability analyses based on thermal expansion forces indicated that ice loading could be a risk to the stability of concrete and masonry dams that are less than 5 m to 10 m high. However, the virtual absence of reported incidents where ice has caused damage to dams (and none in UK) suggest the problem is not as acute as this analysis suggests. A consideration of site-specific factors can identify the likelihood of ice loading developing, the potential consequences of damage and whether intervention could be made in good time or whether permanent measures are warranted.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45824429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Perry Barr and Witton Flood Risk Management Scheme in Birmingham protects over 1,300 properties from a 1% Annual Exceedance Probability flood event. A key component of the scheme is the Forge Mill flood storage area. Construction started in 2018 with the Preliminary Certificate signed off in spring 2022. This paper will discuss the project and share lessons learnt from the construction phase. The lessons learnt cover a variety of areas including programme considerations, use of erosion protection matting, trash screen management and use of 3D models in construction.
{"title":"Perry Bar & Witton FRMS: Forge Mill Flood Storage Area – Lessons Learnt","authors":"Ciara Gill","doi":"10.1680/jdare.22.00093","DOIUrl":"https://doi.org/10.1680/jdare.22.00093","url":null,"abstract":"The Perry Barr and Witton Flood Risk Management Scheme in Birmingham protects over 1,300 properties from a 1% Annual Exceedance Probability flood event. A key component of the scheme is the Forge Mill flood storage area. Construction started in 2018 with the Preliminary Certificate signed off in spring 2022. This paper will discuss the project and share lessons learnt from the construction phase. The lessons learnt cover a variety of areas including programme considerations, use of erosion protection matting, trash screen management and use of 3D models in construction.","PeriodicalId":39070,"journal":{"name":"Dams and Reservoirs","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42506179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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