How did the residential landscape river become dark and smelly overnight?

The landscape river in a residential area in Nanjing became dark and smelly overnight. The property said that the sewage was not produced in the community, but flowed from the upstream. The property said that solving the problem is very simple-when it rains heavily, the rain "washes away" and the river becomes clean.

On August 1 day, the landscape river in the second block of the eastern suburb town was dark, with some garbage floating on the water surface and stinking. It is observed that this river passes through several residential buildings, surrounded by handrails and fences, and its banks are landscaped. Residents passing by covered their noses with their hands and trotted by the river.

"It's strange that we don't know what's going on." Residents said that this black and smelly river was not like this a few days ago. Because this river is not a stagnant water, but a living water flowing through the community from south to north. Although the river is not clear, it is neither black nor smelly. However, from the morning of July 30, we found that the river had become like this, when there were still some white bubbles floating on the water.

On the night of July 3rd 1 day and during the day of August1day, there was light rain in Nanjing. So the river we saw was better than before. But even if the rain is "diluted", the water in this river is still so black and smelly that it is unbearable.

What makes residents feel strange is that the river suddenly becomes dark and smelly, and the water level has changed a lot recently. Sometimes it almost dries up, sometimes water comes from the upper reaches and the water level rises again. "The water from the upstream is this black and smelly water." Some residents speculate that there is a department nearby that engages in river dredging projects and discharges black and smelly mud into this river; Some residents also speculate that some enterprises have discharged pollutants into the river.

The property said that "it can't be solved, and the heavy rain will wash away".

A property staff member said that the property is aware of this situation, but it cannot be solved. Because the sewage is not produced in the community, but flows from the upstream. "This river passes through a large area, including rainwater collected by sewers along Ning Hang Highway near residential areas and domestic sewage around it. It is estimated that it has not rained for a long time recently, the river has not been replenished by rain, and the hot weather has caused the river to deteriorate. " The property manager said that solving the problem is very simple-when it rains heavily, the rain "washes away" and the river becomes clean.