Accommodating stormwater storage structure in the veranda of shop building

Yau Seng, Mah and Norazlina, Bateni and Rosmina, Ahmad Bustami and Jethro, Anak Henry Adam and Afdal Haziq, Mohammad Salehe (2021) Accommodating stormwater storage structure in the veranda of shop building. International Journal of Advanced Technology and Engineering Exploration, 8 (82). pp. 1208-1221. ISSN (Print) 2394-5443, (Online) 2394-7454

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Abstract

This paper describes the investigation to place water storage structure under the veranda of a shop building. A veranda is a commercial building feature in Southeast Asia with a narrow walkway about 3 m wide. Given the small space’s limited capability to hold rainwater from the building roof, a draining tank is, therefore, a more viable choice. Rainwaters flow in and out the tank simultaneously with an outlet control that enables water storage within. A modular-based stormwater storage system that could be assembled under the veranda was selected. Storm Water Management Model version 5.0 was used to model the system. The modular-based system's availability of field test data allowed calibration and verification exercises using the mentioned software and yielded R Square values between 0.97-0.99. As such, the parameters of the system as a storage unit were applied in the modelling of the same system in the veranda. Two cases were presented. The water storage structure was modelled in a single shop lot and a partial commercial area with six units of shop lots and surrounding streets. Modelling the single shop lot with 60% of its roof directing waters to the water storage structure was predicted to reduce 25-30% of its peak values comparing the post-development hydrographs with and without the intervention. The partial commercial area modelling yielded only 0.4-10% prediction in its reduction, suggesting additional intervention was required.

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