Do Rainwater Harvesting Objectives of Water Supply and Stormwater Management Conflict?

Jensen, Mark A.; Steffen, Jennifer; Burian, Steven J.; Pomeroy, Christine

doi:10.1061/41099(367)2

Cited by 10 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The efficiency of RWHS depends on precipitation, catchment area, water demand, and runoff capture (Mun and Han, 2012). The patterns of precipitation and water demand are critical in assessing the perceived benefits of RWHS (Jensen et al, 2010). This can be observed in this study as the monsoon months having higher supply, months with higher working days (May, June, August) having higher water demand, and months with lower working days (such as October/November with Dashain-Tihar vacation) having lower water demand.…”

Section: Supply Vs Demand Modellingmentioning

confidence: 99%

Performance of rooftop rainwater harvesting system as a source of drinking water

2022

View full text Add to dashboard Cite

Rainwater Harvesting Systems (RWHSs) are increasingly being used as an alternative or supplementary source of water to curb the water supply deficit in the Kathmandu valley. The harvested rainwater is primarily used for non-potable purposes like flushing toilets and irrigation, but the knowledge on the use of rainwater for potable purpose is remarkably sparse. This study assesses the suitability of rainwater in terms of quantity and quality in a public school that adopts Rooftop RWHS as the source of drinking water. In this study, we observed that the volume of rainwater being harvested is sufficient to address the current demand of drinking water, with a mean rainfall of 1664 mm on a catchment area of 372 m2. Storage capacity needs to be expanded if the demand increases. Physico-chemical and microbial analyses of water samples (before and after a series of treatments) were carried out for the winter, monsoon, and post-monsoon seasons. The values of physico-chemical parameters of the water samples, in all the seasons, were well within both the National Drinking Water Quality Standards (NDWQS, 2005) and the World Health Organisation (WHO, 2017) guidelines for drinking water, while fecal coliforms were detected in the storage tank, but were absent in tap water after the treatments. Based on the findings, we suggest that the harvested rainwater could be used for drinking purposes if properly treated. RWHS use at the institutional level, like in schools, on the one hand, curbs the increasing demand for water in water-deficit locations like Kathmandu, and on the other, encourages the adoption of such sustainable technologies for the water supply.

show abstract

Section: Supply Vs Demand Modellingmentioning

confidence: 99%

Performance of rooftop rainwater harvesting system as a source of drinking water

2022

View full text Add to dashboard Cite

show abstract

“…This indoor water use is assumed to be consistent across the length of the analysis and any variation from this value has been caused by outdoor water use (Gato et al 2007;Burns et al 2012). The legitimacy of this strategy is based upon two widely used assumptions, that variation in outdoor water use is frequently seasonal (Jensen et al 2010) and that indoor water is non-seasonal (Knights et al 2012).…”

Section: Lowest Average Water Usementioning

confidence: 99%

Modelling household water use: Using empirical data to inform continuous simulation

2019

El Sawah, S. (Ed.) MODSIM2019, 23rd International Congress on Modelling and Simulation.

View full text Add to dashboard Cite

In recent decades traditional water management practices have come under stress from rising global populations and changing climate conditions. The prohibitive costs of upgrading centralised infrastructure networks to meet these changing conditions has encouraged research into the provision of integrated water management at the site scale, such as rainwater harvesting (RWH) or greywater re-use. Unfortunately, effective design, implementation and optimisation of these strategies has been restricted by uncertainties when quantifying how these systems will perform on each site. The reason for this difficulty is that there are many aspects of household or site scale hydrology that are poorly understood or difficult to model, including residential outdoor water use and garden watering. The accuracy and speed at which these aspects of site hydrology can be modelled is a vital consideration in the development of site scale water management. This study aimed to improve the understanding surrounding the accuracy and usability of different strategies for modelling the interaction between the different household water uses. This will provide insight into how their effect upon site scale hydrology can be quantified in future studies and improve the design and optimisation of new integrated water management strategies. This was achieved by analysing four different strategies that each apply different assumptions to account for the three main end uses of household water use (indoor, garden watering and other outdoor water uses) that have been utilised or suggested by previous researchers for use within continuous/water balance simulations. These four strategies were each tested using historic water use data from 100 residential properties in Melbourne's eastern suburbs.

show abstract

“…Although the runoff decrease is an outcome of RWHS (Akter et al, 2020;Deitch & Feirer, 2019;Freni & Liuzzo, 2019;Tamagnone et al, 2020;Teston et al, 2018), there are compatibilization difficulties because the rain barrel water stored volume has to be available to meet demand. Conversely, for runoff generation control, it is necessary making available enough volume to detain the next rainfall (Dornelles, 2012;Hentges, 2013;Jensen et al, 2010;Palla et al, 2017;Petrucci et al, 2012). To study suitably this interaction between so different purposes, high temporal resolutions are required at monitoring and simulation, owing to fast hydrological response.…”

Section: Introductionmentioning

confidence: 99%

Assessment of rainwater harvesting system through continuous simulation with sub-daily data

Santos,

Neves,

Souza

2023

RBRH

View full text Add to dashboard Cite

A rainwater harvesting system, designed for non-potable water uses, can be helpful for runoff generation control. To evaluate this, sub-daily time steps for monitoring and continuous simulations are important tools. Therefore, this paper shows a performance assessment of a rainwater harvesting system for both roof runoff control (maximum flow rate and drained volume) and to meet water demand, from data obtained in a monitoring apparatus and also from continuous simulation using 1-minute time steps data. The model SWMM was calibrated and validated for both a roof and a monitoring apparatus during the monitored period 2018-2019. Thereafter, continuous simulations were accomplished using rainfall, evaporation, and demand time series. For this stage, data satisfied nearly seven years (2014-2020) containing one-minute time step values. Results have shown the control is influenced by the combined action of the first-flush diverter and rainfall regime and was shown to be greater at maximum flow rate than volume.

show abstract

Do Rainwater Harvesting Objectives of Water Supply and Stormwater Management Conflict?

Cited by 10 publications

References 6 publications

Performance of rooftop rainwater harvesting system as a source of drinking water

Performance of rooftop rainwater harvesting system as a source of drinking water

Modelling household water use: Using empirical data to inform continuous simulation

Assessment of rainwater harvesting system through continuous simulation with sub-daily data

Contact Info

Product

Resources

About