Permeable Pavement and Rain Gardens: Flood Retention and Street Water Harvesting

Design a street-edge rain garden in a Taiwanese city, sized for the island's intense summer downpours. Compose a shallow planted depression set below the level of the adjacent permeable paving, its inlet a gap cut in the kerb with a stone splash apron, planted with native sedges and irises that tolerate both flooding and drought. Show the layered section at one exposed end: planting soil, sand, gravel and a perforated pipe. Set an overflow grate at the high end and a low timber edge along the pavement side. Show the basin holding shallow water after rain with silt marks on the stones. Overcast light after a storm, eye-level view, 35mm lens, landscape architecture photography, ultra photorealistic