Proposal of rainwater harvesting coefficient (RWHC) for determination of effectively usable rainfall depth, relevant to rainwater harvesting systems design

Corrêa, Jairo dos Passos; Fernandes, Lindemberg Lima; Blanco, Cláudio José Cavalcante; Neves, Raisa Rodrigues

doi:10.1590/2318-0331.231820170109

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Scientific/Technical Article • RBRH 23 • 2018 • https://doi.org/10.1590/2318-0331.231820170109 copy

Proposal of rainwater harvesting coefficient (RWHC) for determination of effectively usable rainfall depth, relevant to rainwater harvesting systems design

Proposta de coeficiente de aproveitamento de água da chuva (CAAC) para determinação da lâmina efetivamente aproveitável aplicável a projeto de captação e aproveitamento de água pluvial

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The study measures rainfall data to determine a rainwater harvesting coefficient revelant to rainwater harvesting and catchment projects assisted by non-parametric statistics tests, based on assumption that part of the total rainfall depth is discarded. The analyses of historical rainfall series shows that the city of Belem presents large potential to promote rainwater harvesting, with a rainy season and a less rainy season during the year. The results present an average of one rainfall event per day, from January 2001 to December 2011, and of which around 38% is used only for washing the rainwater harvesting system. The Anderson-Darling test revealed a non-adherence of the rainfall series to a normal distribution and according to the Mann-Kendall test, there was no significant trend in the evaluated series. After the calculation of the effective rainfall, determination of coefficients, application of the Anderson-Darling normality test and the Kruskal-Wallis variance test, it was proposed a rainwater harvesting coefficient of 0.78 for the city of Belém, Brasil.

Keywords:
Pluviometer series; Non-parametric tests; Belém

Month	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011
January	0.74	0.82	0.76	0.84	0.77	0.80	0.75	0.79	0.76	0.82	0.80
February	0.79	0.71	0.78	0.78	0.82	0.74	0.79	0.79	0.76	0.78	0.84
March	0.78	0.79	0.77	0.80	0.83	0.81	0.73	0.88	0.83	0.72	0.81
April	0.79	0.84	0.72	0.85	0.89	0.81	0.82	0.78	0.85	0.79	0.84
May	0.75	0.65	0.77	0.68	0.80	0.78	0.75	0.77	0.81	0.79	0.84
June	0.81	0.77	0.69	0.79	0.80	0.53	0.78	0.80	0.77	0.67	0.71
July	0.86	0.79	0.74	0.78	0.82	0.71	0.65	0.71	0.77	0.76	0.68
August	0.73	0.66	0.76	0.61	0.81	0.83	0.80	0.90	0.81	0.86	0.76
September	0.75	0.77	0.77	0.64	0.67	0.80	0.66	0.75	0.81	0.66	0.62
October	0.78	0.66	0.83	0.76	0.82	0.76	0.68	0.73	0.82	0.84	0.71
November	0.71	0.72	0.76	0.63	0.66	0.81	0.71	0.78	0.54	0.64	0.78
December	0.83	0.79	0.80	0.82	0.82	0.82	0.84	0.79	0.76	0.76	0.74

Year	Calculated p-value	Accepted Hypothesis
2001	0.921	Null
2002	0.147	Null
2003	0.478	Null
2004	0.061	Null
2005	0.007	Alternative
2006	<0.005	Alternative
2007	0.824	Null
2008	0.106	Null
2009	<0.005	Alternative
2010	0.415	Null
2011	0.574	Null

Year	Calculated p-value (rainy season)	Accepted Hypothesis	Calculated p-value (low rainy season)	Accepted Hypothesis
2001	0.594	Null	0.867	Null
2002	0.366	Null	0.150	Null
2003	0.508	Null	0.521	Null
2004	0.126	Null	0.096	Null
2005	0.491	Null	0.024	Alternative
2006	0.050	Alternative	0.071	Null
2007	0.296	Null	0.332	Null
2008	0.006	Alternative	0.381	Null
2009	0.101	Null	0.006	Alternative
2010	0.394	Null	0.217	Null
2011	0.124	Null	0.798	Null

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[1] E-mails: eng.jairopassos@gmail.com (JPC), linlimfer@gmail.com (LLF), blanco@ufpa.br (CJCB), raisanevesufpa@gmail.com (RRN)