On-site stormwater detention system within a residential property is meant for an
environmental protection device that temporarily stores stormwater within the property lot to
mitigate flash flood, particularly during rainy seasons brought by the northeast monsoon. A
field test was constructed in a house’s car porch with a 4.40 m x 4.70 m x 0.45 m tank filled
with precast-concrete modular units with an effective storage volume of 3.97 m3
. The system
received water from a 95 m2 house roof via 0.1 m diameter pipe, discharged water via 0.05 m
diameter pipe. It had recorded six observed storm events coincided with the 2019/2020
monsoon season that consisted 20–50 mm peak hourly rainfall, 0.0007–0.0018 m3 s-1 inflow,
0.0005–0.0012 m3 s
-1 outflow and 0.21–0.47 m water level. Another four historical storm
events coincided with the monsoon from 2015–2017 were sourced to augment the analysis. A
computer model developed using the storm water management model was calibrated and
verified using the six observed events.Etc...
Keywords
Field test; Inflow; Outflow; Rainfall; StormPav; SWMM; Water level