文章基本信息

标题：Assessment of rainfall variability, rainwater harvesting potential and storage requirements in Odeda Local Government Area of Ogun State in South-western Nigeria
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作者：Isaac Idowu Balogun ; Adebayo Olatunbosun Sojobi ; Bosede Oyegbemijo Oyedepo 等
期刊名称：Cogent Environmental Science
电子版ISSN：2331-1843
出版年度：2016
卷号：2
期号：1
页码：1138597
DOI：10.1080/23311843.2016.1138597
语种：English
出版社：Taylor and Francis Ltd
摘要：Abstract Rainfall variability with periodicity of 5–6 years has been demonstrated for our study area and may be attributed to tropical and extra-tropical factors which operate during different months, seasons and years. Rainfall variability in terms of coefficient of variation ranges from 24 to 39% and 26 to 41% for the seasons and months. The mean increase of 1.63 mm/year and 1.37 mm/year experienced in the dry season months (November–April) and the wet season months (May–October), respectively, is insignificant from a water management perspective. Hoeffding’s D statistics revealed prevalence of non-monotonic trend in all the months and seasons. Recommended minimum and maximum storage capacity requirements for a six-member household to maximize rainwater harvesting are 1 and 6 m³, respectively. The rainwater harvesting potential for the area of study ranges between 18.16 and 27.45 m³ and 15.23 and 30.40 m³ based on the maximum error estimate and coefficient of variation methods. Domestic rainwater harvesting has the potential to meet 27.51–54.91% of non-potable household water demand as well as 78.34–156.38% of household potable water demand for a six-member household. It is highly encouraged as a supplementary water source especially in rural and peri-urban areas to reduce their vulnerability to acute shortage of water infrastructure.
关键词：climograph ; domestic rainwater harvesting ; rainfall variability ; rainwater harvesting potential ; seasonal classification of climate ; standardized precipitation index ; storage requirements ; water demand