This park was one of our favorite places to go when the kids were little. There was a fountain in the middle and the water was really clear we could see small fishes in the water. The other day I was surprised to see that it is now almost completely covered with tiny little floating plants called duckweeds (Lemna minor).
Given the right conditions, duckweeds can be very prolific. One reason for this fast growth in this pond could be high nitrogen content of the water. The sloped surrounding grass area is kept green year round - meaning high amounts of nitrogen is applied on a regular basis. It is expected that some nitrogen find their way to the pond through runoff. A second reason for the high nitrogen content of the water could be due to the animal waste from all the ducks in area.
It appears that the duck population in the area cannot keep up with the growth of the duckweed. I wonder what the Community Service District will do with this pond - to get rid of the duckweed infestation. They could keep it that way or do something to remove it so that the water can be clear again. They could increase the duck population but that will only increase the amount of animal waste going into the water. They could skim the duckweed regularly but that would be labor intensive. Duckweed is rich in nitrogen and would make an excellent composting material; local gardeners can be encouraged to do their part and harvest some of the duckweeds.