Replying to @MorteJude
yan ba yung pag umulan nang malakas, half ng park na yan, babahain. half, dry. yung part na babahain, duon pupunta yung tubig imbis sa loob ng city. so, safe yung city sa baha. pag walang ulan, recreational area nila yan.
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The Choa Chu Kang LGU created hidden "alleys" so that the park doesn't flood during downpours. And even during drizzles, the Bishan-Ang Mo Kio park is a recreational area + national service training location.