Even car parking should have a concept for a botanic garden, and it's "ecological" for Putrajaya. The vegetation is of the tropical rainforest, the materials must be from the local geology; earth brick, lime stone slab and granite gravel. According to an engineer from Japan, the excess 5-10% water cause flood at the lower stream. In other words, if you take care of 5-10% of surface run off in a development to be absorbed into the ground, then there would be no flood. So, our parking lot is loose gravels to which water can sip through, the bottom of the drain is also gravels from where trees suck the water.
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