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Water 2014, 6(12), 3913-3933; doi:10.3390/w6123913

Dimensionless Analysis for Designing Domestic Rainwater Harvesting Systems at the Regional Level in Northern Taiwan

Department of Harbor and River Engineering, National Taiwan Ocean University, No. 2 Pei-Ni Road, Keelung 20224, Taiwan
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Received: 29 September 2014 / Revised: 3 December 2014 / Accepted: 4 December 2014 / Published: 12 December 2014
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Abstract

A regional-level and dimensionless analysis for designing a domestic rainwater harvesting system (DRWHS) was developed. To consider various combinations of water demand, storage capacity, effective roof area, and rainfall in DRWHS design, two dimensionless ratios were used, namely, demand fraction and storage fraction, along with a relationship between the two ratios. Firstly, Northern Taiwan was divided into four sub-regions through cluster analysis based on the average annual 10-day rainfall distribution at rainfall stations and administrative districts. Easy-to-use dimensionless curves between demand fraction and storage fraction were obtained for five rainwater supply reliabilities of the DRWHS for the four sub-regions. Based on the dimensionless curves, a nomogram was constructed for designing DRWHSs at a rainwater supply reliability of 95% in the sub-region I. Storage capacities determined from the dimensionless curves showed a close fit with those determined from simulated values, but were larger than the values estimated from the method presented in the Green Building Evaluation Manual in most situations. The methodology developed herein can be used effectively for the preliminary design of a DRWHS and for overcoming the difficulties faced in designing a DRWHS without rainfall data and with incomplete rainfall data. View Full-Text
Keywords: cluster analysis; dimensionless analysis; domestic rainwater harvesting system (DRWHS); regional level cluster analysis; dimensionless analysis; domestic rainwater harvesting system (DRWHS); regional level
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liaw, C.-H.; Chiang, Y.-C. Dimensionless Analysis for Designing Domestic Rainwater Harvesting Systems at the Regional Level in Northern Taiwan. Water 2014, 6, 3913-3933.

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