Patent ID: 8703257

Claim:
A water storage structure comprising: a water-repellent layer having a water-repellent surface; a recess defined by an upper surface of the water repellent layer; and a flexible sheet disposed at an outer periphery of the recess, the flexible sheet defining a hole larger than the recess, wherein the water-repellent layer and the flexible sheet are configured to store free standing water in the recess, wherein the water-repellent layer includes bedded objects having water repellency in surfaces thereof and which are separable from each other, wherein the objects contact each other at multiple points and a contact angle formed on the surface of each object with water exceeds 90 degrees to form a configuration that prevents water from passing through the water-repellent layer, wherein the flexible sheet is configured to prevent water from leaking at the outer periphery of the recess, and wherein the size of each of the objects is 425 to 850 μm.