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Sustainability 2018, 10(2), 407; https://doi.org/10.3390/su10020407

Investigating the Influence of Various Stormwater Runoff Control Facilities on Runoff Control Efficiency in a Small Catchment Area

1
Department of Decision Science for Sustainable Society, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2
Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
3
Japan Railway Construction, Transport and Technology Agency, 1-13-26 Nishiki, Naka-ku, Nagoya city, Aichi prefecture 460-0003, Japan
*
Author to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 30 January 2018 / Accepted: 2 February 2018 / Published: 5 February 2018
(This article belongs to the Special Issue Urban Water Management)
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Abstract

Urbanization causes an increase in the flood discharge because of the infiltration capacity. Furthermore, extreme precipitation events have been an increasing concern for many regions worldwide. This study aimed to investigate the influence of different outflow control facilities on runoff reduction in a small watershed. We focused on the soil-improvement technology and rainwater tanks as outflow control facilities and conducted a runoff calculation using a rainfall event of a magnitude that is likely to occur once in a hundred years. The calculation showed that the soil-improvement technology reduced runoff during long-term continuous rainfall, whereas in a concentrated short-term rainfall event, a significant difference in the runoff reduction effect between rainfall tanks of various volumes was observed. Since effective countermeasures for runoff reduction differ depending on the rainfall distribution pattern, we suggested both facilities for storing initial rainfall and initiating countermeasures for penetration improvement over the long term. View Full-Text
Keywords: urbanization; runoff reduction; soil improvement; rainwater tank; runoff simulation urbanization; runoff reduction; soil improvement; rainwater tank; runoff simulation
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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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Itsukushima, R.; Ogahara, Y.; Iwanaga, Y.; Sato, T. Investigating the Influence of Various Stormwater Runoff Control Facilities on Runoff Control Efficiency in a Small Catchment Area. Sustainability 2018, 10, 407.

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