I recently moved into an area where there was an urban pond. Although I knew some things about where the water came from I hadn’t fully explored the pond. I decided to head out and explore my pond.
I left my house in the morning and there was a steady rain. I wanted to see where the water came from that entered the pond. The water was running down the cement grooves on the side of the road and entering storm drains.
There were also grass swales between and behind house to direct storm water flow. Another feature which I hadn't seen many of was a paved swale that went directly into the pond. This is a good example between impervious surfaces and pervious surfaces. The grassy swale(pervious) allows water to enter into the ground and we see no pooling water while paved swale (impervious) doesn’t allow any water to enter and it immediately turned into a small stream. The water in the paved swale was moving quickly and was able to bring bigger pieces of debris (rocks, dirt, sticks) which would fill up the pond quicker with sediments.
Another source of water entering the pond was rooftop eavestroughs. In this picture we can see water has eroded the dirt and flows from the downspout which will enter the pond.
I went to check out the inlets to see how much and how clear the water was coming in. My pond had two inlets. How many inlets does your pond have?
One of the inlets had a rushing flow while the other had a constant flow. Although it appeared that both inlet forbays were the same size they received different amounts of incoming water and sediments.
As water was rushing into the pond I went to go check out the outlet. I was expecting water to be flowing out of the outlet but to my surprise the water level was much below the outlet and nothing was flowing out. As you can see in the picture the outlet was overgrown with weeds and hardly visible.
I walked to where the outlet would exit to see where (if there was flow) the water would enter. There was a large section of large rocks which would slow the flow and allow water to enter the soil beneath the rocks. After the long stretch of rock is enters a creek. After a big of research online I learned that this creek was Thompson Creek.
I followed the stream to see if there was a larger source of water that feed this stream. It was in fact connected to the large Otonabee Canal. This is a navigational canal part of the Trent Severn Waterway. There was a small damn where water feed the stream.
I encourage you to take some time and work through this activity to think more about the pond you are studying. If you wanted to write a blog this could be a great start. It would also provide the researchers with valuable information.