The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
P. Denny - One of the best experts on this subject based on the ideXlab platform.
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Hosepipe—a WWW-hosted data management and analysis system for STS content mapping projects
Mammalian Genome, 1997Co-Authors: M. A. Strivens, P. Middlehurst, S. D. M. Brown, P. DennyAbstract:We have developed a data management system, ‘Hosepipe’ (High Output STS Evaluation pipeline) to aid sample tracking and data analysis in STS content mapping projects. The system is based around a World Wide Web (WWW) server that provides a number of pages including forms for sample processing and data entry accessible via a standard WWW browser application. The system is split into two main modules: firstly, a sequence evaluation and annotation module that takes de novo sequence for a potential STS, screens it against existing STSs and DNA sequence databases, followed by appropriate primer sequence design; secondly, a module that handles YAC library STS screening and includes facilities for both sample tracking and experimental data analysis. We present the design and rationale of the Hosepipe system and its development to support a whole chromosomal physical mapping project. This software and design approach is potentially applicable to physical mapping projects of varying sizes and resolution and to similar projects, such as sample sequencing and the construction of sequence-ready maps.
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Hosepipe--a WWW-hosted data management and analysis system for STS content mapping projects.
Mammalian genome : official journal of the International Mammalian Genome Society, 1997Co-Authors: M. A. Strivens, P. Middlehurst, S. D. M. Brown, P. DennyAbstract:We have developed a data management system, 'Hosepipe' (High Output STS Evaluation pipeline) to aid sample tracking and data analysis in STS content mapping projects. The system is based around a World Wide Web (WWW) server that provides a number of pages including forms for sample processing and data entry accessible via a standard WWW browser application. The system is split into two main modules: firstly, a sequence evaluation and annotation module that takes de novo sequence for a potential STS, screens it against existing STSs and DNA sequence databases, followed by appropriate primer sequence design; secondly, a module that handles YAC library STS screening and includes facilities for both sample tracking and experimental data analysis. We present the design and rationale of the Hosepipe system and its development to support a whole chromosomal physical mapping project. This software and design approach is potentially applicable to physical mapping projects of varying sizes and resolution and to similar projects, such as sample sequencing and the construction of sequence-ready maps.
Peter Ede - One of the best experts on this subject based on the ideXlab platform.
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re construction of historic drought in the anglian region uk over the period 1798 2010 and the implications for water resources and drought management
Journal of Hydrology, 2015Co-Authors: Gerry Spraggs, Louise Peaver, P D Jones, Peter EdeAbstract:Summary This study reconstructs droughts during the period 1798–2010 and assesses the consequences for water resource planning, drought management and resilience across the Anglian region (UK). Rain gauge series were extended to cover the period 1798–2010 and used to produce a 213-year daily dataset on a 5 km × 5 km grid matching recent data produced by the UK Met Office. Potential evapotranspiration data was extended using the Thornthwaite equation, based on data from the Central England Temperature series and potential evapotranspiration from the Met Office Rainfall and Evapotranspiration Calculation System. Rainfall and potential evapotranspiration series were input to rainfall-runoff models and flows simulated from 1800–2010. Reservoir simulation using these flows indicates that inclusion of pre-1920 droughts does not reduce yields and actually increases yields at five reservoirs, ranging from 1% to 16.6%, compared with the post-1920 period, the period normally used in reservoir yield calculation and the preparation of Water Resources Management and Drought Plans. Post-1920 droughts define drought intensity at all 5 reservoirs and, with some exceptions, comprise the three worst droughts in the period 1800–2010. Droughts during 1933–36 and 1943–46 are the most severe in the west of the Anglian region, 1989–92 in the north and 1996–98 in the east. 1854–1860 emerges as the period of regionally highest ranked drought severity in the period 1800–1919, but 1893–1907 also features strongly in the west. Contiguous dry winters and summers are a feature of the more severe droughts. Drought periods are consistent with previously reported major drought episodes in England and Wales, with the notable exception of 1801–1816, which emerges as much less severe from this study. The worst hydrological droughts from runoff deficiency analysis do not generally appear critical for reservoirs, emphasising the importance of simulating reservoir response over a long time span and suggesting that individual reservoir storage and infrastructure provide resilience. Despite spatial variability, the more severe droughts are widespread (e.g. 1854–60, 1933–36) and may influence resilience of the larger integrated water resource system that includes river and groundwater sources. Extended sensitivity analysis should be carried out to quantify uncertainty arising from data reconstruction and hydrological modelling, including the choice of model, before inclusion of reservoir yields in Water Resource Management Plans. The ‘library’ of drought information from this study, paralleled by sensitivity analysis, will be useful during drought for reservoir scenario projection and quantification of the risk of restrictions to supply, such as the effect of a ban on the use of Hosepipes; in ‘planning mode’ for testing the robustness of Drought Plans; and for application to other catchments across the region. Long rainfall and temperature series and recorded river flows are available for extending the approach used here to elsewhere in the UK, Europe and other parts of the world.
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Re-construction of historic drought in the Anglian Region (UK) over the period 1798–2010 and the implications for water resources and drought management
Journal of Hydrology, 2015Co-Authors: Gerry Spraggs, Louise Peaver, Philip Jones, Peter EdeAbstract:Summary This study reconstructs droughts during the period 1798–2010 and assesses the consequences for water resource planning, drought management and resilience across the Anglian region (UK). Rain gauge series were extended to cover the period 1798–2010 and used to produce a 213-year daily dataset on a 5 km × 5 km grid matching recent data produced by the UK Met Office. Potential evapotranspiration data was extended using the Thornthwaite equation, based on data from the Central England Temperature series and potential evapotranspiration from the Met Office Rainfall and Evapotranspiration Calculation System. Rainfall and potential evapotranspiration series were input to rainfall-runoff models and flows simulated from 1800–2010. Reservoir simulation using these flows indicates that inclusion of pre-1920 droughts does not reduce yields and actually increases yields at five reservoirs, ranging from 1% to 16.6%, compared with the post-1920 period, the period normally used in reservoir yield calculation and the preparation of Water Resources Management and Drought Plans. Post-1920 droughts define drought intensity at all 5 reservoirs and, with some exceptions, comprise the three worst droughts in the period 1800–2010. Droughts during 1933–36 and 1943–46 are the most severe in the west of the Anglian region, 1989–92 in the north and 1996–98 in the east. 1854–1860 emerges as the period of regionally highest ranked drought severity in the period 1800–1919, but 1893–1907 also features strongly in the west. Contiguous dry winters and summers are a feature of the more severe droughts. Drought periods are consistent with previously reported major drought episodes in England and Wales, with the notable exception of 1801–1816, which emerges as much less severe from this study. The worst hydrological droughts from runoff deficiency analysis do not generally appear critical for reservoirs, emphasising the importance of simulating reservoir response over a long time span and suggesting that individual reservoir storage and infrastructure provide resilience. Despite spatial variability, the more severe droughts are widespread (e.g. 1854–60, 1933–36) and may influence resilience of the larger integrated water resource system that includes river and groundwater sources. Extended sensitivity analysis should be carried out to quantify uncertainty arising from data reconstruction and hydrological modelling, including the choice of model, before inclusion of reservoir yields in Water Resource Management Plans. The ‘library’ of drought information from this study, paralleled by sensitivity analysis, will be useful during drought for reservoir scenario projection and quantification of the risk of restrictions to supply, such as the effect of a ban on the use of Hosepipes; in ‘planning mode’ for testing the robustness of Drought Plans; and for application to other catchments across the region. Long rainfall and temperature series and recorded river flows are available for extending the approach used here to elsewhere in the UK, Europe and other parts of the world.
M. A. Strivens - One of the best experts on this subject based on the ideXlab platform.
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Hosepipe—a WWW-hosted data management and analysis system for STS content mapping projects
Mammalian Genome, 1997Co-Authors: M. A. Strivens, P. Middlehurst, S. D. M. Brown, P. DennyAbstract:We have developed a data management system, ‘Hosepipe’ (High Output STS Evaluation pipeline) to aid sample tracking and data analysis in STS content mapping projects. The system is based around a World Wide Web (WWW) server that provides a number of pages including forms for sample processing and data entry accessible via a standard WWW browser application. The system is split into two main modules: firstly, a sequence evaluation and annotation module that takes de novo sequence for a potential STS, screens it against existing STSs and DNA sequence databases, followed by appropriate primer sequence design; secondly, a module that handles YAC library STS screening and includes facilities for both sample tracking and experimental data analysis. We present the design and rationale of the Hosepipe system and its development to support a whole chromosomal physical mapping project. This software and design approach is potentially applicable to physical mapping projects of varying sizes and resolution and to similar projects, such as sample sequencing and the construction of sequence-ready maps.
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Hosepipe--a WWW-hosted data management and analysis system for STS content mapping projects.
Mammalian genome : official journal of the International Mammalian Genome Society, 1997Co-Authors: M. A. Strivens, P. Middlehurst, S. D. M. Brown, P. DennyAbstract:We have developed a data management system, 'Hosepipe' (High Output STS Evaluation pipeline) to aid sample tracking and data analysis in STS content mapping projects. The system is based around a World Wide Web (WWW) server that provides a number of pages including forms for sample processing and data entry accessible via a standard WWW browser application. The system is split into two main modules: firstly, a sequence evaluation and annotation module that takes de novo sequence for a potential STS, screens it against existing STSs and DNA sequence databases, followed by appropriate primer sequence design; secondly, a module that handles YAC library STS screening and includes facilities for both sample tracking and experimental data analysis. We present the design and rationale of the Hosepipe system and its development to support a whole chromosomal physical mapping project. This software and design approach is potentially applicable to physical mapping projects of varying sizes and resolution and to similar projects, such as sample sequencing and the construction of sequence-ready maps.
Nico Goldscheider - One of the best experts on this subject based on the ideXlab platform.
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Comparative application and optimization of different single-borehole dilution test techniques
Hydrogeology Journal, 2020Co-Authors: Nikolai Fahrmeier, Nadine Goeppert, Nico GoldscheiderAbstract:Einzel-Bohrloch-Verdünnungsversuche (Single borehole dilution tests, SBDTs) sind eine Methode zur Charakterisierung von Grundwassermessstellen und basieren auf der Eingabe eines Tracers in die gesättigte Zone und der Beobachtung der Konzentrationen über Tiefe und Zeit. SBDTs sind in allen Grundwasserleitertypen anwendbar, aber besonders interessant in heterogenen Karst- oder Kluftgrundwasserleitern. Uniforme Injektionen zielen auf eine homogene Tracerkonzentration über die gesamte gesättigte Zone ab und liefern Informationen über Zu- und Abflusshorizonte. Falls keine vertikale Fließkomponente vorliegt, können zusätzlich horizontale Filtergeschwindigkeiten berechnet werden. Die gebräuchlichste Methode für uniforme Injektionen verwendet einen Schlauch zur Eingabe des Tracers. Dieser Bericht stellt eine vereinfachte Methode vor, bei der ein permeabler Injektionsbeutel (PIB) verwendet wird, um eine nahezu gleichmäßige Verteilung innerhalb der gesättigten Zone zu erreichen. Zur Bewertung der neuen Methode und Ermittlung von Vor- und Nachteilen, wurden zahlreiche Tests im Labor sowie in mehreren Grundwassermessstellen im Gelände durchgeführt. Basierend auf der zeitlichen Entwicklung der Salzmenge und der berechneten scheinbaren Filtergeschwindigkeiten, wurde die Reproduzierbarkeit der PIB-Methode bewertet. Die scheinbaren Filtergeschwindigkeiten wurden sowohl durch lineare Regression als auch durch Umkehrung der 1D-Advektions-Dispersionsgleichung mittels CXTFIT berechnet. Die Ergebnisse zeigen, dass uniforme SBDTs mit der PIB-Methode wertvolle und reproduzierbare Ergebnisse liefern und zum Verständnis von Grundwassermessstellen und des jeweiligen Aquifers beitragen. Außerdem erfordert die neue Eingabemethode im Vergleich zur Schlauchinjektion weniger Ausrüstung und Aufwand und ist besonders vorteilhaft für tiefe Messstellen. Les tests de dilution pour un seul forage (TDSF) sont une méthode de caractérisation de piézomètres et des forages, et reposent sur l’injection d’un traceur au niveau de la zone saturée et sur l’observation de la concentration en fonction de la profondeur et du temps. Les TDSF sont applicables pour tous les types d’aquifères, mais particulièrement intéressants pour les aquifères karstiques hétérogènes ou fracturés. Les injections uniformes visent à une concentration homogène du traceur sur toute la longueur saturée et fournissent des informations sur les horizons à écoulements entrant ou sortant. De plus, en l’absence d’écoulement vertical, les vitesses de filtration horizontales peuvent être calculées. La méthode la plus courante pour les injections uniformes utilise un tuyau souple pour injecter le traceur. Cet article introduit une méthode simplifiée qui utilise un sac d’injection perméable (SIP) pour obtenir une distribution de traceur quasi uniforme dans la zone saturée. Afin d’évaluer la nouvelle méthode et d’identifier les avantages et inconvénients, plusieurs tests ont été réalisés, en laboratoire et dans les piézomètres multiples sur le terrain. La reproductibilité de la méthode SIP a été évaluée via des tests répétés, sur la base du développement de la quantité de sel au cours du temps et des vitesses apparentes de filtration calculées. Les vitesses apparentes de filtration ont été calculées en utilisant une régression linéaire ainsi qu’en inversant l’équation d’advection-dispersion 1D à l’aide de CXTFIT. Les résultats montrent que les TDSF à injection uniforme selon la méthode SIP produisent des résultats valables et reproductibles et contribuent à la compréhension des piézomètres et de leur aquifère respectif. De plus, en comparaison avec la méthode dite du tuyau souple, la nouvelle méthode d’injection nécessite moins d’équipement and moins d’effort, et est particulièrement utile pour les forages profonds. Single-borehole dilution tests (SBDTs) are a method for characterizing groundwater monitoring wells and boreholes, and are based on the injection of a tracer into the saturated zone and the observation of concentration over depth and time. SBDTs are applicable in all aquifer types, but especially interesting in heterogeneous karst or fractured aquifers. Uniform injections aim at a homogeneous tracer concentration throughout the entire saturated length and provide information about inflow and outflow horizons. Also, in the absence of vertical flow, horizontal filtration velocities can be calculated. The most common method for uniform injections uses a Hosepipe to inject the tracer. This report introduces a simplified method that uses a permeable injection bag (PIB) to achieve a close-to-uniform tracer distribution within the saturated zone. To evaluate the new method and to identify advantages and disadvantages, several tests have been carried out, in the laboratory and in multiple groundwater monitoring wells in the field. Reproducibility of the PIB method was assessed through repeated tests, on the basis of the temporal development of salt amount and calculated apparent filtration velocities. Apparent filtration velocities were calculated using linear regression as well as by inverting the one-dimensional (1D) advection-dispersion equation using CXTFIT. The results show that uniform-injection SBDTs with the PIB method produce valuable and reproducible outcomes and contribute to the understanding of groundwater monitoring wells and the respective aquifer. Also, compared to the Hosepipe method, the new injection method requires less equipment and less effort, and is especially useful for deep boreholes. Las pruebas de dilución en una sola perforación (SBDTs) son métodos para caracterizar los pozos y perforaciones de monitoreo de aguas subterráneas, y se basan en la inyección de un trazador en la zona saturada y en la observación de la concentración a lo largo de la profundidad y el tiempo. Los SBDTs son aplicables en todos los tipos de acuíferos, pero son especialmente interesantes en los acuíferos kársticos heterogéneos o fracturados. Las inyecciones uniformes tienen por objeto lograr una concentración homogénea del trazador en toda la zona saturada y proporcionan información sobre los horizontes de afluencia y de descarga. Además, en ausencia de flujo vertical, se pueden calcular las velocidades de filtración horizontal. El método más común para las inyecciones uniformes utiliza un tubo flexible para inyectar el trazador. En este documento se presenta un método simplificado que utiliza una bolsa de inyección permeable (PIB) para lograr una distribución del trazador cercana a la uniforme dentro de la zona saturada. Para evaluar el nuevo método e identificar las ventajas y desventajas, se han realizado varias pruebas, en el laboratorio y en múltiples pozos de monitoreo de aguas subterráneas en el campo. La representatividad del método PIB se evaluó mediante ensayos repetidos, sobre la base del desarrollo temporal de la cantidad de sal y las velocidades de filtración aparente calculadas. Las velocidades de filtración aparentes se calcularon utilizando una regresión lineal, así como invirtiendo la ecuación de advección-dispersión en 1D utilizando CXTFIT. Los resultados muestran que las SBDTs de inyección uniforme con el método PIB producen resultados valiosos y reproducibles y contribuyen a la comprensión de los pozos de monitoreo de las aguas subterráneas y el acuífero respectivo. Además, en comparación con el método de tubo flexible, el nuevo método de inyección requiere menos equipo y menos esfuerzo, y es especialmente útil para los pozos profundos. Os Testes de Diluição de Poço Único (TDPU) consistem em um método para caracterizar a água subterrânea em poços de monitoramento e de abastecimento, e são baseados na injeção de traçador na zona saturada e observação da concentração ao longo da profundidade e do tempo. Os TDPU são aplicáveis em todos os tipos aquíferos, mas são especialmente interessantes em carstes heterogêneos ou aquíferos fraturados. Injeções uniformes visam a concentração homogênea do traçador através de toda espessura saturada e fornece informação sobre horizontes de fluxos afluentes e efluentes. Além disso, na ausência de fluxo vertical, as velocidades de filtração horizontal podem ser calculadas. O método mais comum para injeções uniformes utilizam uma mangueira para injetar o traçador. Este artigo introduz um método simplificado que utiliza um saco permeável de injeção (SPI) para alcançar uma distribuição de traçador próxima de uniforme dentro da zona saturada. Para avaliar o novo método e identificar vantagens e desvantagens, muitos testes foram realizados, no laboratório e em diversos poços de monitoramento de água subterrânea a campo. A reprodutibilidade do método SPI foi avaliada através de repetidos testes, com base na evolução da quantidade de sais e velocidades de filtração aparentes. As velocidades de filtração aparente foram calculadas utilizando regressão linear e invertendo a equação 1D de advecção-dispersão utilizando CXTFIT. Os resultados mostram que injeções uniformes de TDPU com o método SPI produzem resultados valiosos e reprodutíveis e contribuem para a compreensão dos poços de monitoramento e o respectivo aquífero. Além disso, comparado ao método da mangueira, o novo método de injeção requer menos equipamentos e menos esforço e é especialmente útil para poços profundos. 单孔稀释试验(SBDTs)是描述地下水监测井和钻孔特征的方法,其基本原理是向饱和带中注入示踪剂,并观察示踪剂浓度随深度和时间的变化情况。该方法适用于所有含水层类型,尤其是非均质的岩溶或裂隙含水层。均匀注入旨在使整个饱和带长度内的示踪剂浓度均匀分布,并提供流入和流出层位的信息。另外,在没有垂直方向水流的情况下,还可以计算出水平渗透速度。最常见的均匀注入的方法是用软管注入示踪剂。本文介绍了一种简化的方法,即用渗透注射袋(PIB)在饱和带内获得接近均匀的示踪剂分布。为了评价该方法并确定其优缺点,在实验室和场地多个地下水监测井中进行了多次试验。通过反复试验,根据盐量随时间的变化和计算的视渗透速度,评估这种新法的重复性。利用线性回归和使用CXTFIT反演的一维对流扩散方程计算视渗流速度。结果表明,利用渗透注射袋方法进行均匀注入的单孔稀释实验可以产生有价值和可重复性的结果,有助于了解地下水监测井和其所在的含水层信息。此外,与软管法相比,新的注入法需要更少的设备和更少的工作量,特别是对深孔更为有用。
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Comparative application and optimization of different single-borehole dilution test techniques
Hydrogeology Journal, 2020Co-Authors: Nikolai Fahrmeier, Nadine Goeppert, Nico GoldscheiderAbstract:Single-borehole dilution tests (SBDTs) are a method for characterizing groundwater monitoring wells and boreholes, and are based on the injection of a tracer into the saturated zone and the observation of concentration over depth and time. SBDTs are applicable in all aquifer types, but especially interesting in heterogeneous karst or fractured aquifers. Uniform injections aim at a homogeneous tracer concentration throughout the entire saturated length and provide information about inflow and outflow horizons. Also, in the absence of vertical flow, horizontal filtration velocities can be calculated. The most common method for uniform injections uses a Hosepipe to inject the tracer. This report introduces a simplified method that uses a permeable injection bag (PIB) to achieve a close-to-uniform tracer distribution within the saturated zone. To evaluate the new method and to identify advantages and disadvantages, several tests have been carried out, in the laboratory and in multiple groundwater monitoring wells in the field. Reproducibility of the PIB method was assessed through repeated tests, on the basis of the temporal development of salt amount and calculated apparent filtration velocities. Apparent filtration velocities were calculated using linear regression as well as by inverting the one-dimensional (1D) advection-dispersion equation using CXTFIT. The results show that uniform-injection SBDTs with the PIB method produce valuable and reproducible outcomes and contribute to the understanding of groundwater monitoring wells and the respective aquifer. Also, compared to the Hosepipe method, the new injection method requires less equipment and less effort, and is especially useful for deep boreholes.
Gerry Spraggs - One of the best experts on this subject based on the ideXlab platform.
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re construction of historic drought in the anglian region uk over the period 1798 2010 and the implications for water resources and drought management
Journal of Hydrology, 2015Co-Authors: Gerry Spraggs, Louise Peaver, P D Jones, Peter EdeAbstract:Summary This study reconstructs droughts during the period 1798–2010 and assesses the consequences for water resource planning, drought management and resilience across the Anglian region (UK). Rain gauge series were extended to cover the period 1798–2010 and used to produce a 213-year daily dataset on a 5 km × 5 km grid matching recent data produced by the UK Met Office. Potential evapotranspiration data was extended using the Thornthwaite equation, based on data from the Central England Temperature series and potential evapotranspiration from the Met Office Rainfall and Evapotranspiration Calculation System. Rainfall and potential evapotranspiration series were input to rainfall-runoff models and flows simulated from 1800–2010. Reservoir simulation using these flows indicates that inclusion of pre-1920 droughts does not reduce yields and actually increases yields at five reservoirs, ranging from 1% to 16.6%, compared with the post-1920 period, the period normally used in reservoir yield calculation and the preparation of Water Resources Management and Drought Plans. Post-1920 droughts define drought intensity at all 5 reservoirs and, with some exceptions, comprise the three worst droughts in the period 1800–2010. Droughts during 1933–36 and 1943–46 are the most severe in the west of the Anglian region, 1989–92 in the north and 1996–98 in the east. 1854–1860 emerges as the period of regionally highest ranked drought severity in the period 1800–1919, but 1893–1907 also features strongly in the west. Contiguous dry winters and summers are a feature of the more severe droughts. Drought periods are consistent with previously reported major drought episodes in England and Wales, with the notable exception of 1801–1816, which emerges as much less severe from this study. The worst hydrological droughts from runoff deficiency analysis do not generally appear critical for reservoirs, emphasising the importance of simulating reservoir response over a long time span and suggesting that individual reservoir storage and infrastructure provide resilience. Despite spatial variability, the more severe droughts are widespread (e.g. 1854–60, 1933–36) and may influence resilience of the larger integrated water resource system that includes river and groundwater sources. Extended sensitivity analysis should be carried out to quantify uncertainty arising from data reconstruction and hydrological modelling, including the choice of model, before inclusion of reservoir yields in Water Resource Management Plans. The ‘library’ of drought information from this study, paralleled by sensitivity analysis, will be useful during drought for reservoir scenario projection and quantification of the risk of restrictions to supply, such as the effect of a ban on the use of Hosepipes; in ‘planning mode’ for testing the robustness of Drought Plans; and for application to other catchments across the region. Long rainfall and temperature series and recorded river flows are available for extending the approach used here to elsewhere in the UK, Europe and other parts of the world.
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Re-construction of historic drought in the Anglian Region (UK) over the period 1798–2010 and the implications for water resources and drought management
Journal of Hydrology, 2015Co-Authors: Gerry Spraggs, Louise Peaver, Philip Jones, Peter EdeAbstract:Summary This study reconstructs droughts during the period 1798–2010 and assesses the consequences for water resource planning, drought management and resilience across the Anglian region (UK). Rain gauge series were extended to cover the period 1798–2010 and used to produce a 213-year daily dataset on a 5 km × 5 km grid matching recent data produced by the UK Met Office. Potential evapotranspiration data was extended using the Thornthwaite equation, based on data from the Central England Temperature series and potential evapotranspiration from the Met Office Rainfall and Evapotranspiration Calculation System. Rainfall and potential evapotranspiration series were input to rainfall-runoff models and flows simulated from 1800–2010. Reservoir simulation using these flows indicates that inclusion of pre-1920 droughts does not reduce yields and actually increases yields at five reservoirs, ranging from 1% to 16.6%, compared with the post-1920 period, the period normally used in reservoir yield calculation and the preparation of Water Resources Management and Drought Plans. Post-1920 droughts define drought intensity at all 5 reservoirs and, with some exceptions, comprise the three worst droughts in the period 1800–2010. Droughts during 1933–36 and 1943–46 are the most severe in the west of the Anglian region, 1989–92 in the north and 1996–98 in the east. 1854–1860 emerges as the period of regionally highest ranked drought severity in the period 1800–1919, but 1893–1907 also features strongly in the west. Contiguous dry winters and summers are a feature of the more severe droughts. Drought periods are consistent with previously reported major drought episodes in England and Wales, with the notable exception of 1801–1816, which emerges as much less severe from this study. The worst hydrological droughts from runoff deficiency analysis do not generally appear critical for reservoirs, emphasising the importance of simulating reservoir response over a long time span and suggesting that individual reservoir storage and infrastructure provide resilience. Despite spatial variability, the more severe droughts are widespread (e.g. 1854–60, 1933–36) and may influence resilience of the larger integrated water resource system that includes river and groundwater sources. Extended sensitivity analysis should be carried out to quantify uncertainty arising from data reconstruction and hydrological modelling, including the choice of model, before inclusion of reservoir yields in Water Resource Management Plans. The ‘library’ of drought information from this study, paralleled by sensitivity analysis, will be useful during drought for reservoir scenario projection and quantification of the risk of restrictions to supply, such as the effect of a ban on the use of Hosepipes; in ‘planning mode’ for testing the robustness of Drought Plans; and for application to other catchments across the region. Long rainfall and temperature series and recorded river flows are available for extending the approach used here to elsewhere in the UK, Europe and other parts of the world.