a water drain from the roof of an apartment building in a courtyard is covered with snow in december. berlin, germany

architecture construction environment ecological industrial reflection silberbach historical apartment courtyard rainwater drainpipe gardening landscape undefined building december mountain aqueduct drainage draining gardener industry outdoors railroad waterway covered germany ecology plastic railway gutters housing berlin garden nature system travel kempen german water drain fresh grass green house metal steel stone roof snow lawn path pipe rail rain road bach fall flow moss city eco old way