Robust rainwater harvesting: Probabilistic tank sizing for climate change adaptation

Daniel Lash, Sarah Ward, T J Kershaw, David Butler, Matthew Eames

Research output: Contribution to journalArticle

Abstract

Rainwater harvesting (RWH) systems are increasingly being implemented in buildings. It is common in the UK for simple RWH tank sizing methods to be utilised, and these do not consider future climate change. This paper describes the development of a tool, which integrates elements of basic and detailed sizing approaches from the British Standard for RWH, with the latest probabilistic UK Climate Projections data. The method was initially applied to the design of a university building in Cornwall, UK. The methodology utilises 3,000 equi-probable rainfall patterns for tank sizing for each time period. Results indicate that, to ensure that it is ‘likely’ that the same non-potable demand could be met in 2080 as in the present, a tank 112% larger would be required. This increases to a 225% over-sizing for a ‘very likely’ probability of meeting the same level of non-potable demand. The same RWH system design was then assessed for three further UK locations with different rainfall characteristics. From these assessments a simplified method was developed to enable practitioners to size RWH system tanks for current and future climates. The method provides a new approach to meet present and future non-potable demands, while preventing excessive over-sizing of tanks.
LanguageEnglish
Pages526-539
JournalJournal of Water and Climate Change
Volume5
Issue number4
Early online date5 May 2014
DOIs
StatusPublished - 10 Dec 2014

Fingerprint

rainwater
rainfall
climate
climate change adaptation
sizing
climate change
methodology
method
demand

Keywords

  • adaptation
  • tank sizing
  • climate change
  • probabilistic
  • rainwater harvesting
  • resilient

Cite this

Robust rainwater harvesting : Probabilistic tank sizing for climate change adaptation. / Lash, Daniel; Ward, Sarah; Kershaw, T J; Butler, David; Eames, Matthew.

In: Journal of Water and Climate Change, Vol. 5, No. 4, 10.12.2014, p. 526-539.

Research output: Contribution to journalArticle

Lash, Daniel ; Ward, Sarah ; Kershaw, T J ; Butler, David ; Eames, Matthew. / Robust rainwater harvesting : Probabilistic tank sizing for climate change adaptation. In: Journal of Water and Climate Change. 2014 ; Vol. 5, No. 4. pp. 526-539.
@article{8c42821dcceb445e9a63490d7cd3578c,
title = "Robust rainwater harvesting: Probabilistic tank sizing for climate change adaptation",
abstract = "Rainwater harvesting (RWH) systems are increasingly being implemented in buildings. It is common in the UK for simple RWH tank sizing methods to be utilised, and these do not consider future climate change. This paper describes the development of a tool, which integrates elements of basic and detailed sizing approaches from the British Standard for RWH, with the latest probabilistic UK Climate Projections data. The method was initially applied to the design of a university building in Cornwall, UK. The methodology utilises 3,000 equi-probable rainfall patterns for tank sizing for each time period. Results indicate that, to ensure that it is ‘likely’ that the same non-potable demand could be met in 2080 as in the present, a tank 112{\%} larger would be required. This increases to a 225{\%} over-sizing for a ‘very likely’ probability of meeting the same level of non-potable demand. The same RWH system design was then assessed for three further UK locations with different rainfall characteristics. From these assessments a simplified method was developed to enable practitioners to size RWH system tanks for current and future climates. The method provides a new approach to meet present and future non-potable demands, while preventing excessive over-sizing of tanks.",
keywords = "adaptation, tank sizing, climate change, probabilistic, rainwater harvesting, resilient",
author = "Daniel Lash and Sarah Ward and Kershaw, {T J} and David Butler and Matthew Eames",
year = "2014",
month = "12",
day = "10",
doi = "10.2166/wcc.2014.080",
language = "English",
volume = "5",
pages = "526--539",
journal = "Journal of Water and Climate Change",
issn = "2040-2244",
publisher = "IWA Publishing",
number = "4",

}

TY - JOUR

T1 - Robust rainwater harvesting

T2 - Journal of Water and Climate Change

AU - Lash, Daniel

AU - Ward, Sarah

AU - Kershaw, T J

AU - Butler, David

AU - Eames, Matthew

PY - 2014/12/10

Y1 - 2014/12/10

N2 - Rainwater harvesting (RWH) systems are increasingly being implemented in buildings. It is common in the UK for simple RWH tank sizing methods to be utilised, and these do not consider future climate change. This paper describes the development of a tool, which integrates elements of basic and detailed sizing approaches from the British Standard for RWH, with the latest probabilistic UK Climate Projections data. The method was initially applied to the design of a university building in Cornwall, UK. The methodology utilises 3,000 equi-probable rainfall patterns for tank sizing for each time period. Results indicate that, to ensure that it is ‘likely’ that the same non-potable demand could be met in 2080 as in the present, a tank 112% larger would be required. This increases to a 225% over-sizing for a ‘very likely’ probability of meeting the same level of non-potable demand. The same RWH system design was then assessed for three further UK locations with different rainfall characteristics. From these assessments a simplified method was developed to enable practitioners to size RWH system tanks for current and future climates. The method provides a new approach to meet present and future non-potable demands, while preventing excessive over-sizing of tanks.

AB - Rainwater harvesting (RWH) systems are increasingly being implemented in buildings. It is common in the UK for simple RWH tank sizing methods to be utilised, and these do not consider future climate change. This paper describes the development of a tool, which integrates elements of basic and detailed sizing approaches from the British Standard for RWH, with the latest probabilistic UK Climate Projections data. The method was initially applied to the design of a university building in Cornwall, UK. The methodology utilises 3,000 equi-probable rainfall patterns for tank sizing for each time period. Results indicate that, to ensure that it is ‘likely’ that the same non-potable demand could be met in 2080 as in the present, a tank 112% larger would be required. This increases to a 225% over-sizing for a ‘very likely’ probability of meeting the same level of non-potable demand. The same RWH system design was then assessed for three further UK locations with different rainfall characteristics. From these assessments a simplified method was developed to enable practitioners to size RWH system tanks for current and future climates. The method provides a new approach to meet present and future non-potable demands, while preventing excessive over-sizing of tanks.

KW - adaptation

KW - tank sizing

KW - climate change

KW - probabilistic

KW - rainwater harvesting

KW - resilient

UR - http://dx.doi.org/10.2166/wcc.2014.080

UR - http://www.iwaponline.com/jwc/up/jwc2014080.htm

U2 - 10.2166/wcc.2014.080

DO - 10.2166/wcc.2014.080

M3 - Article

VL - 5

SP - 526

EP - 539

JO - Journal of Water and Climate Change

JF - Journal of Water and Climate Change

SN - 2040-2244

IS - 4

ER -