Pub Date : 2020-07-31DOI: 10.1080/13241583.2020.1795339
Siobhan Davies, Jason Wilson, M. Ridges
ABSTRACT Cultural flows are water allocations to Aboriginal groups to maintain cultural values. Economic frameworks treat cultural values as sites or places where ‘cultural activities’ take place. A cultural flow is then a discretionary allocation of water to ‘water’ those sites, in the same way that water is delivered to irrigators to water their crops. This water allocation framework, in which environmental, irrigation or cultural values are traded off in a zero-sum game, is grounded in economic and legal frameworks that treat spiritual, environmental, economic and social values as separate and unconnected value domains. In contrast, within Aboriginal ontology each value domain is inherently connected, and cannot be traded off against the others. Interpreting cultural beliefs as akin to a recreational activity ignores the relationship between cultural belief and Aboriginal economic and social organisation. We use a case study of the Narran Lakes area of NSW to explore the relationship between cultural beliefs and the way in which Country was managed under cultural law. Understanding this relationship is important in the economic analysis of cultural flows.
{"title":"Redefining ‘cultural values’ – the economics of cultural flows","authors":"Siobhan Davies, Jason Wilson, M. Ridges","doi":"10.1080/13241583.2020.1795339","DOIUrl":"https://doi.org/10.1080/13241583.2020.1795339","url":null,"abstract":"ABSTRACT Cultural flows are water allocations to Aboriginal groups to maintain cultural values. Economic frameworks treat cultural values as sites or places where ‘cultural activities’ take place. A cultural flow is then a discretionary allocation of water to ‘water’ those sites, in the same way that water is delivered to irrigators to water their crops. This water allocation framework, in which environmental, irrigation or cultural values are traded off in a zero-sum game, is grounded in economic and legal frameworks that treat spiritual, environmental, economic and social values as separate and unconnected value domains. In contrast, within Aboriginal ontology each value domain is inherently connected, and cannot be traded off against the others. Interpreting cultural beliefs as akin to a recreational activity ignores the relationship between cultural belief and Aboriginal economic and social organisation. We use a case study of the Narran Lakes area of NSW to explore the relationship between cultural beliefs and the way in which Country was managed under cultural law. Understanding this relationship is important in the economic analysis of cultural flows.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1795339","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49266191","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 : 2020-07-21DOI: 10.1080/13241583.2020.1792632
Lara B. Taylor, A. Fenemor, Roku Mihinui, Te Atarangi Sayers, Tina Porou, D. Hikuroa, N. Harcourt, P. White, M. O'Connor
ABSTRACT Aotearoa New Zealand’s environmental policy and legislation recognises Māori Indigenous principles and values, and gives prominence to Te Mana o te Wai (the authority of water itself). However, current policy, legislation, and practice are inadequate for enabling Māori rights and interests in water takes and instream flows and levels, in terms of both involvement and specific allocation mechanisms supporting Māori values. We argue that a policy and implementation space needs to be created that ensures indigenous Māori engagement and outcomes in freshwater governance, planning, and management. This space should provide for an integrated, precautionary, and bicultural ‘First Principles’ approach, ensuring that Māori rights and interests consistent with Te Tiriti o Waitangi/the Treaty of Waitangi (1840) are enabled, including the exercise of mātauranga Māori (knowledge informed by Māori worldviews), tikanga (Māori customs and lore), and kaitiakitanga (guardianship). We outline a potential water allocation framework, Ngā Puna Aroha, that could provide direction and give confidence and certainty to the implementers of national water policy. Such an approach would need to be supported by a broader bicultural policy and we suggest an overarching philosophy Ngā Taonga Tuku Iho, which would encompass all natural ‘resource’ management, providing a korowai (cloak) for the management of each particular ‘resource’ or taonga (treasure) including freshwater. This type of bicultural proposal could inform freshwater and wider natural ‘resource’ management policymaking, regulatory frameworks, and implementation nationally and internationally.
新西兰的环境政策和立法承认Māori土著原则和价值观，并突出了Te Mana o Te Wai(水本身的权威)。然而，就参与和支持Māori价值的具体分配机制而言，目前的政策、立法和实践不足以使Māori在取水和溪流流量和水位方面的权利和利益得以实现。我们认为，需要创造一个政策和实施空间，以确保土著Māori在淡水治理、规划和管理方面的参与和成果。这个空间应该提供一种综合的、预防性的、双文化的“第一原则”方法，确保Māori符合《怀唐伊提里提》/《怀唐伊条约》(1840)的权利和利益得以实现，包括mātauranga Māori(通过Māori世界观获得的知识)、tikanga (Māori习俗和爱)和kaitiakitanga(监护)的行使。我们概述了一个潜在的水资源分配框架，即Ngā Puna Aroha，它可以为国家水资源政策的执行者提供方向、信心和确定性。这种方法需要得到更广泛的双文化政策的支持，我们提出了一种涵盖所有自然“资源”管理的总体哲学，为每一种特定“资源”或包括淡水在内的Taonga(宝藏)的管理提供一种korowai(斗篷)。这种类型的双文化建议可以为淡水和更广泛的自然“资源”管理决策、监管框架以及国家和国际实施提供信息。
{"title":"Ngā Puna Aroha: towards an indigenous-centred freshwater allocation framework for Aotearoa New Zealand","authors":"Lara B. Taylor, A. Fenemor, Roku Mihinui, Te Atarangi Sayers, Tina Porou, D. Hikuroa, N. Harcourt, P. White, M. O'Connor","doi":"10.1080/13241583.2020.1792632","DOIUrl":"https://doi.org/10.1080/13241583.2020.1792632","url":null,"abstract":"ABSTRACT Aotearoa New Zealand’s environmental policy and legislation recognises Māori Indigenous principles and values, and gives prominence to Te Mana o te Wai (the authority of water itself). However, current policy, legislation, and practice are inadequate for enabling Māori rights and interests in water takes and instream flows and levels, in terms of both involvement and specific allocation mechanisms supporting Māori values. We argue that a policy and implementation space needs to be created that ensures indigenous Māori engagement and outcomes in freshwater governance, planning, and management. This space should provide for an integrated, precautionary, and bicultural ‘First Principles’ approach, ensuring that Māori rights and interests consistent with Te Tiriti o Waitangi/the Treaty of Waitangi (1840) are enabled, including the exercise of mātauranga Māori (knowledge informed by Māori worldviews), tikanga (Māori customs and lore), and kaitiakitanga (guardianship). We outline a potential water allocation framework, Ngā Puna Aroha, that could provide direction and give confidence and certainty to the implementers of national water policy. Such an approach would need to be supported by a broader bicultural policy and we suggest an overarching philosophy Ngā Taonga Tuku Iho, which would encompass all natural ‘resource’ management, providing a korowai (cloak) for the management of each particular ‘resource’ or taonga (treasure) including freshwater. This type of bicultural proposal could inform freshwater and wider natural ‘resource’ management policymaking, regulatory frameworks, and implementation nationally and internationally.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1792632","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42340483","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 : 2020-07-02DOI: 10.1080/13241583.2020.1804042
G. Walker, Quan J. Wang, A. Horne, Rick Evans, S. Richardson
ABSTRACT A risk assessment of the reduction of streamflow in the Murray-Darling Basin (MDB) from potential increased groundwater extraction has been conducted. This incorporates the uncertainty of future extraction and connectivity between groundwater and surface water. The predicted impact from forty years of growth in extraction is less than 580 Gl/y, and likely to be in range of 100–400 Gl/y. Over 80% of this impact will result from extraction under limits existing before the Basin Plan, with most impact from extraction outside these limits occurring later. Groundwater units with high risk lie within a range of river valleys and hydrogeological domains, and particularly the Goulburn valley and zones of fresher groundwater discharge. Management rules in the new groundwater management plans are designed to reduce use in high impact zones. Monitoring is required to assess effectiveness of these as use increases and conjunctive water management becomes more common.
{"title":"Potential cumulative impacts on river flow volume from increased groundwater extraction under the Murray-Darling Basin Plan","authors":"G. Walker, Quan J. Wang, A. Horne, Rick Evans, S. Richardson","doi":"10.1080/13241583.2020.1804042","DOIUrl":"https://doi.org/10.1080/13241583.2020.1804042","url":null,"abstract":"ABSTRACT A risk assessment of the reduction of streamflow in the Murray-Darling Basin (MDB) from potential increased groundwater extraction has been conducted. This incorporates the uncertainty of future extraction and connectivity between groundwater and surface water. The predicted impact from forty years of growth in extraction is less than 580 Gl/y, and likely to be in range of 100–400 Gl/y. Over 80% of this impact will result from extraction under limits existing before the Basin Plan, with most impact from extraction outside these limits occurring later. Groundwater units with high risk lie within a range of river valleys and hydrogeological domains, and particularly the Goulburn valley and zones of fresher groundwater discharge. Management rules in the new groundwater management plans are designed to reduce use in high impact zones. Monitoring is required to assess effectiveness of these as use increases and conjunctive water management becomes more common.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1804042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49172461","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 : 2020-07-02DOI: 10.1080/13241583.2020.1824610
M. Bahrami, M. Amiri, Morteza Badkubi
ABSTRACT One of the important alternative water sources for non-potable purposes is greywater, but needs to remove contaminants. The aim of this study was to investigate the performance of a horizontal series filter (HSF) consists of sand, zeolite (Z), pumice (P), and granular activated carbon (GAC) to analyse the chemical oxygen demand (COD), biochemical oxygen demand (BOD5), total dissolved solids (TDS), turbidity, and pH in greywater samples from Fasa University Student Hostel, Iran. Recycling treatment was performed by passing the greywater through filters. After the last filter, treated greywater was returned into the main tank. The system was run at filtration rate of 2.94 m3 day−1. The analysis of the data from the filtration tests showed that GAC is the best adsorbent for removing COD, BOD5, and TDS from greywater, followed by zeolite. Whereas, pumice is more advisable to remove turbidity. However, due to the different mass of adsorbents in the filters, pumice showed a higher adsorption capacity than zeolite. Generally, the triple combination of GAC+Z + P represented the best performance in the reduction of COD, BOD5, TDS, turbidity up to 90.42%, 91.43%, 82.95%, and 90.27%, respectively. Therefore, the studied system can be implemented in public places to greywater treatment and reuse.
{"title":"Application of horizontal series filtration in greywater treatment: a semi-industrial study","authors":"M. Bahrami, M. Amiri, Morteza Badkubi","doi":"10.1080/13241583.2020.1824610","DOIUrl":"https://doi.org/10.1080/13241583.2020.1824610","url":null,"abstract":"ABSTRACT One of the important alternative water sources for non-potable purposes is greywater, but needs to remove contaminants. The aim of this study was to investigate the performance of a horizontal series filter (HSF) consists of sand, zeolite (Z), pumice (P), and granular activated carbon (GAC) to analyse the chemical oxygen demand (COD), biochemical oxygen demand (BOD5), total dissolved solids (TDS), turbidity, and pH in greywater samples from Fasa University Student Hostel, Iran. Recycling treatment was performed by passing the greywater through filters. After the last filter, treated greywater was returned into the main tank. The system was run at filtration rate of 2.94 m3 day−1. The analysis of the data from the filtration tests showed that GAC is the best adsorbent for removing COD, BOD5, and TDS from greywater, followed by zeolite. Whereas, pumice is more advisable to remove turbidity. However, due to the different mass of adsorbents in the filters, pumice showed a higher adsorption capacity than zeolite. Generally, the triple combination of GAC+Z + P represented the best performance in the reduction of COD, BOD5, TDS, turbidity up to 90.42%, 91.43%, 82.95%, and 90.27%, respectively. Therefore, the studied system can be implemented in public places to greywater treatment and reuse.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1824610","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47192403","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 : 2020-07-02DOI: 10.1080/13241583.2020.1790126
Elliott Leonard Provis
ABSTRACT In Australia, contestation over the use of water resources remains fierce and these contests extends into regional cities and urban capitals. The 2008 Echuca Declaration by the Murray Lower Darling Indigenous Nations called for a share of these water entitlements to be legally and beneficially owned by First Nations with an associated right to use such resources for economic liberation – termed as ‘Cultural Flows’. This was necessary because of the inadequacies First Nations of the Murray–Darling Basin encountered when seeking legal recognition of their cultural rights to water; but as the literature has shown these difficulties are not unique to just First Nations of the Murray–Darling Basin. Similar problems confront First Nations throughout Australia, especially so in urban Australia. There is limited research into how Cultural Flows can be procured in cities, or how recycled water and treated urban stormwater runoff might have a part to play in the achievement of cultural water management objectives set by Indigenous communities. Centred on the Victorian planning scheme, this research aims to bridge this gap through a policy analysis of recycled water and urban stormwater runoff governance. From here, how this approach might be implemented is discussed.’
{"title":"Recognising the value of urban runoff and reclaimed water for cultural flows in melbourne: implementation through the planning scheme","authors":"Elliott Leonard Provis","doi":"10.1080/13241583.2020.1790126","DOIUrl":"https://doi.org/10.1080/13241583.2020.1790126","url":null,"abstract":"ABSTRACT In Australia, contestation over the use of water resources remains fierce and these contests extends into regional cities and urban capitals. The 2008 Echuca Declaration by the Murray Lower Darling Indigenous Nations called for a share of these water entitlements to be legally and beneficially owned by First Nations with an associated right to use such resources for economic liberation – termed as ‘Cultural Flows’. This was necessary because of the inadequacies First Nations of the Murray–Darling Basin encountered when seeking legal recognition of their cultural rights to water; but as the literature has shown these difficulties are not unique to just First Nations of the Murray–Darling Basin. Similar problems confront First Nations throughout Australia, especially so in urban Australia. There is limited research into how Cultural Flows can be procured in cities, or how recycled water and treated urban stormwater runoff might have a part to play in the achievement of cultural water management objectives set by Indigenous communities. Centred on the Victorian planning scheme, this research aims to bridge this gap through a policy analysis of recycled water and urban stormwater runoff governance. From here, how this approach might be implemented is discussed.’","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1790126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44974047","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 : 2020-07-02DOI: 10.1080/13241583.2020.1800332
N. Kirk, Melissa Robson-Williams, A. Fenemor, N. Heath
ABSTRACT Freshwater policy is driven by interrelated challenges such as declining water quality, urban expansion, and agricultural intensification. But recent research indicates that implementation of policy is less successful than its development. Given recent innovations in New Zealand’s freshwater management and policy, this paper asks, What are the barriers to freshwater policy implementation in New Zealand? Data for this research were gathered through semi-structured interviews with key regional council and unitary authority employees. The research discovered several implementation barriers, such as low government and community capacity and difficulty aligning local policy with national policy. The paper argues that a closed loop between problem identification and responding to problems through planning slows the implementation of freshwater policy. In response, the paper offers a set of recommendations, designed for the New Zealand context, to enable more effective implementation of freshwater policy.
{"title":"Exploring the barriers to freshwater policy implementation in New Zealand","authors":"N. Kirk, Melissa Robson-Williams, A. Fenemor, N. Heath","doi":"10.1080/13241583.2020.1800332","DOIUrl":"https://doi.org/10.1080/13241583.2020.1800332","url":null,"abstract":"ABSTRACT Freshwater policy is driven by interrelated challenges such as declining water quality, urban expansion, and agricultural intensification. But recent research indicates that implementation of policy is less successful than its development. Given recent innovations in New Zealand’s freshwater management and policy, this paper asks, What are the barriers to freshwater policy implementation in New Zealand? Data for this research were gathered through semi-structured interviews with key regional council and unitary authority employees. The research discovered several implementation barriers, such as low government and community capacity and difficulty aligning local policy with national policy. The paper argues that a closed loop between problem identification and responding to problems through planning slows the implementation of freshwater policy. In response, the paper offers a set of recommendations, designed for the New Zealand context, to enable more effective implementation of freshwater policy.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1800332","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47398662","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 : 2020-07-02DOI: 10.1080/13241583.2020.1822139
A. Arthington
Sandra Postel is the author of four books on fresh water – its amazing properties, global distribution patterns, human uses, ecological values, and water management practices. Her first, the Last O...
{"title":"Replenish: the virtuous cycle of water and prosperity","authors":"A. Arthington","doi":"10.1080/13241583.2020.1822139","DOIUrl":"https://doi.org/10.1080/13241583.2020.1822139","url":null,"abstract":"Sandra Postel is the author of four books on fresh water – its amazing properties, global distribution patterns, human uses, ecological values, and water management practices. Her first, the Last O...","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1822139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41582437","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 : 2020-07-02DOI: 10.1080/13241583.2020.1810927
D. Kemp, T. Daniell
ABSTRACT Flood hydrograph estimation in Australia is mostly undertakenby a class of models known as runoff routing models. These models have in common the sub-division of the catchment into a number of sub-catchments, with the application of excess rainfall to each sub-catchment and the routing through a series of nonlinear storages representing the channel flow through the catchment. The first Australian runoff routing model was developed in the 1960s, and there have been numerous models developed that contain the same basic structure, with enhancements. With the release of Australian Rainfall & Runoff there were significant changes in the way design floods are estimated in Australia, with flood estimation by runoff routing beingmodified to include a joint probability approach rather than a design flood approach, so that the variability and interaction of flood-producing factors are better allowed for. This paper reviews the development of runoff routing within Australia, from the original 1960s model to joint probability, and identifies issues associated with the models, including self-consistency and the limitation on the runoff processes that can be modelled. The required features of a model that address the limitations of current models are described.
{"title":"A review of flow estimation by runoff routing in Australia – and the way forward","authors":"D. Kemp, T. Daniell","doi":"10.1080/13241583.2020.1810927","DOIUrl":"https://doi.org/10.1080/13241583.2020.1810927","url":null,"abstract":"ABSTRACT Flood hydrograph estimation in Australia is mostly undertakenby a class of models known as runoff routing models. These models have in common the sub-division of the catchment into a number of sub-catchments, with the application of excess rainfall to each sub-catchment and the routing through a series of nonlinear storages representing the channel flow through the catchment. The first Australian runoff routing model was developed in the 1960s, and there have been numerous models developed that contain the same basic structure, with enhancements. With the release of Australian Rainfall & Runoff there were significant changes in the way design floods are estimated in Australia, with flood estimation by runoff routing beingmodified to include a joint probability approach rather than a design flood approach, so that the variability and interaction of flood-producing factors are better allowed for. This paper reviews the development of runoff routing within Australia, from the original 1960s model to joint probability, and identifies issues associated with the models, including self-consistency and the limitation on the runoff processes that can be modelled. The required features of a model that address the limitations of current models are described.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1810927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41932549","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 : 2020-07-02DOI: 10.1080/13241583.2020.1787702
G. Walker, Quan J. Wang, A. Horne, Rick Evans, S. Richardson
ABSTRACT Concerns have been raised that the use of infrastructure and water efficiency projects to recover water entitlements for the environment in the Murray–Darling Basin (MDB) could be undermined by a reduction in return flows to rivers. Water use efficiency changes prior to 2009 had already reduced surface return flows. A dimensionless and normalised variable, connectivity factor (CF), has been used to analyse the cumulative impact on river flow from actions that alter groundwater recharge or extraction. CF is objectively estimated from existing modelling outputs for three large alluvial groundwater systems in south-eastern MDB relevant to a major water use efficiency program. Lower values of CF (0.05–0.45) imply lower reductions of return flows, less impacts on recovered water entitlements, with impacts more likely to be managed adaptively within current water management plans. The study should help allay concerns by explaining why previous estimates had been overly high.
{"title":"Estimating groundwater-river connectivity factor for quantifying changes in irrigation return flows in the Murray–Darling Basin","authors":"G. Walker, Quan J. Wang, A. Horne, Rick Evans, S. Richardson","doi":"10.1080/13241583.2020.1787702","DOIUrl":"https://doi.org/10.1080/13241583.2020.1787702","url":null,"abstract":"ABSTRACT Concerns have been raised that the use of infrastructure and water efficiency projects to recover water entitlements for the environment in the Murray–Darling Basin (MDB) could be undermined by a reduction in return flows to rivers. Water use efficiency changes prior to 2009 had already reduced surface return flows. A dimensionless and normalised variable, connectivity factor (CF), has been used to analyse the cumulative impact on river flow from actions that alter groundwater recharge or extraction. CF is objectively estimated from existing modelling outputs for three large alluvial groundwater systems in south-eastern MDB relevant to a major water use efficiency program. Lower values of CF (0.05–0.45) imply lower reductions of return flows, less impacts on recovered water entitlements, with impacts more likely to be managed adaptively within current water management plans. The study should help allay concerns by explaining why previous estimates had been overly high.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1787702","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42581374","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 : 2020-07-02DOI: 10.1080/13241583.2020.1824367
X. Leng, H. Chanson
ABSTRACT Low-level river crossings and culverts deliver valuable transportation and hydraulic control services to the society, but have negative impacts in terms of upstream fish passage. Recently, full-height sidewall baffles have been imposed in north-eastern Australia to assist upstream passage of small-bodied fish in box culverts, although the impact on the culvert discharge capacity was ignored. Detailed physical modelling was conducted under controlled flow conditions in a near-full-scale culvert barrel channel, equipped with such full-height sidewall baffles. The results provide a quantitative assessment of the impact of full-height sidewall baffles on the discharge capacity of box culverts. Applications were developed for single- and multi-cell box culverts, and practical implications are discussed.
{"title":"How full-height sidewall baffles affect box culvert capacity: balancing fish passage and discharge requirements","authors":"X. Leng, H. Chanson","doi":"10.1080/13241583.2020.1824367","DOIUrl":"https://doi.org/10.1080/13241583.2020.1824367","url":null,"abstract":"ABSTRACT Low-level river crossings and culverts deliver valuable transportation and hydraulic control services to the society, but have negative impacts in terms of upstream fish passage. Recently, full-height sidewall baffles have been imposed in north-eastern Australia to assist upstream passage of small-bodied fish in box culverts, although the impact on the culvert discharge capacity was ignored. Detailed physical modelling was conducted under controlled flow conditions in a near-full-scale culvert barrel channel, equipped with such full-height sidewall baffles. The results provide a quantitative assessment of the impact of full-height sidewall baffles on the discharge capacity of box culverts. Applications were developed for single- and multi-cell box culverts, and practical implications are discussed.","PeriodicalId":51870,"journal":{"name":"Australasian Journal of Water Resources","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13241583.2020.1824367","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41398487","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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