21st century tale of the riverbank

Ratty loved to sit on the grassy bank of the winding river.  Relaxing in the warmth of the sun it was hard to stop his little eyes from closing, lean back and just lie with his head resting on one of the soft, sheep-nibbled tussocks. Today though it was not to be for he only had one thought in mind. Staring into the dark, gaping, arched mouth of the tunnel he was eagerly awaiting the next rush of foam coming out into the light of day. His nostrils and whiskers started to twitch and quiver in anticipation as he heard the iron grill rising, knowing a rush of sweet-smelling sewage would soon come pouring out once more as another mass of rubbish was discharged into the sparkling stream. Each time it occurred he would dive into the water, paws outstretched as he paddled through the grey scum on the surface of the water and with a merry smile on his face sift through the dark tumbling cloud examining any floating lumps for delicacies to take home to his little burrow where he could spread them out before Mistress rat and after she had made her choice they would both slowly eat their chosen meal.