dc.contributor.author | Ahilan, S | |
dc.contributor.author | Webber, J | |
dc.contributor.author | Butler, D | |
dc.date.accessioned | 2021-02-24T10:20:24Z | |
dc.date.issued | 2021-02-21 | |
dc.description.abstract | The increasing magnitude and frequency of extreme rainfall events coupled with a rapid growth in urban populations is leading to surface water flooding being recognised as one of the pre-eminent natural hazards impacting communities, properties and infrastructure. However, if managed effectively, urban storm water also represents a promising resource to enhance water supply resilience. This research investigates how catchment-scale rainwater management can be applied to achieve flood and drought resilience through capturing extreme rainfall and contributing to water demands at the property scale. The study investigates a case study in Pandon Dene, North East England, implemented in three stages: Firstly, evaluating the household water demand and supply from an individual rainwater harvesting system; Secondly, examining the effects of catchment scale rainwater management on urban flood resilience; And thirdly, assessing cost-effectiveness of strategies. Three types of household rainwater harvesting systems are considered in the performance evaluation, including a single storage tank, a passive system with regulated overflow and an active system with real time control. Household demand and supply is characterised using 15-minute resolution non-potable property scale water consumption, evaluated through continuous simulation over a 36-year period (1984-2019). Long-term continuous simulation enables quantification of water supply efficiency and overflow from the rainwater harvesting system at individual houses. Urban flood resilience from catchment scale application is evaluated using a rapid two-dimensional cellular automata flood model (CADDIES), with the estimated overflow from each of the household applied as a model input to examine strategy response to 36 historical rainfall events, ranging from a 1 in 1-year through to a 1 in 140-year return period. Cost effectiveness is evaluated using a rainwater system cost model and a GIS-based hazard impact assessment tool for flood damage mitigation. Analysis indicates that all three rainwater harvesting systems deliver water-saving benefits and stormwater benefits to varying degrees. The single storage tank and passive rainwater harvesting system are particularly effective to regulate more frequent (< 10-year) and moderate (< 30-year) storm events whereas the active system can effectively regulate larger (< 50-year) rainfall events. At the same time, results also indicate that a system primarily designed for water supply augmentation provides up to 64% of non-potable demand (toilet flushing) alongside 77% (median) reduction of stormwater peak runoff into the sewer system. Dual modes of resilience indicate that distributed catchment-scale rainwater management can deliver multi-functional, multi-benefit systems. | en_GB |
dc.description.sponsorship | Engineering and Physical Sciences Research Council (EPSRC) | en_GB |
dc.identifier.citation | URCC 2020: Urban Resilience in a context of Climate Change Conference, 20 - 21 October, online, p. 110 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/124876 | |
dc.language.iso | en | en_GB |
dc.publisher | URCC 2020 | en_GB |
dc.relation.url | https://www.urcc2020.eu/index.php/downloads/ | en_GB |
dc.rights | © 2020 URCC 2020 | en_GB |
dc.title | Achieving urban water supply and flood resilience using catchment scale rainwater management | en_GB |
dc.type | Conference paper | en_GB |
dc.date.available | 2021-02-24T10:20:24Z | |
dc.description | This is the final version. Available from URCC 2020 via the link in this record | en_GB |
dc.rights.uri | http://www.rioxx.net/licenses/all-rights-reserved | en_GB |
pubs.funder-ackownledgement | Yes | en_GB |
exeter.funder | ::Engineering and Physical Sciences Research Council (EPSRC) | en_GB |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2021-02-21 | |
rioxxterms.type | Conference Paper/Proceeding/Abstract | en_GB |
refterms.dateFCD | 2021-02-23T19:55:35Z | |
refterms.versionFCD | EVoR | |
refterms.dateFOA | 2021-02-24T10:20:28Z | |
refterms.panel | B | en_GB |