Impervious

It rained again yesterday. It has become a norm recently for the sky to rain, to pour, to soak and wash the Earth.
We were running when it happened. The dark clouds were looming like the low tides on the beach. Being the Safety IC, I sat aside can watched the pattern of the sky twist and twirl.
Below this sea of black stood the greyness of the Tekong Parade square. The whistle is blown and the crowds begin to move in synchrony. They seemed almost mechanical and the hands of an analogy watch in an awkward rusty motion. Siting back, I then noticed random dark spots splattering across the conrete terrain.
A little at first, the more... and more. Within seconds, i could see these droplets of rain transform into a massive moving sea of waves like a film over the square. I could feel their struggling attempts to exit via the drains but their size was too overwhelming.
Impervious. This struck me. In Geography, impervious refers to the quality of a rock strata that inhibits the further gravitational flow of water downwards. Natural impervious layers could be found in depths of the Earth. They hold water and form the water table that supports springs and wells.
Geography is the study of humans too. Concrete forms an impervious layer too, however, unlike wells and springs... they are found on the surface instead. As such, when the sky rains and cleanses, nothing is absorbed by the Earth below. Everything is brushed away, wasted, flushed away as the soil cracks below. Impervious