That looks different.
Let’s go check it out.
J brought his infrared thermal imager to the scene and, as you would expect, there is a “warm” spot in the area that is not frozen. There is a relative difference of about 9 degrees F. in that area compared to its surrounding.
Here’s a theory. A little over two years ago, I started the groundwork for our orchard. We dug about 570 linear feet of on-contour berms and swales upslope of this little pond. Already, it looks so different with shrubs, trees, and perennial grasses, plants, and weeds growing there. It is, also, functioning differently, in that; water captured in the swales percolates into the soil much more quickly.
I’ve been observing this pond, almost daily, for four winters. I’ve never seen this “hole” in the ice before this year. I’m seeing the phenomenon every time the pond freezes this winter. We were informed that there were no springs on this property. This man-made pond captures runoff from the upper slopes. We fully expected that there was a seep here as the pond never dried up. It got low but never dry in the time that I’ve been here. Downslope from this pond is Rattlesnake Run.
I’m suspecting that this feature in the ice represents the emergence of an active spring where there had only been a low flow seep feeding the pond. That would be a nice surprise after such a dry fall season. If this is indeed a spring, if it is really “new;” Could it be related to the swales that I dug two years ago?
Swales capture water from the rainfall as well as run off from the slope above them. I have understood that when you build swales there is potential for new springs to emerge lower on the slope. The following well-written explanation comes from www.permaculturefoodforest.wordpress.com.
The purpose of a swale is to harvest water passively. Over time, this will establish a permanent growing system, storing moisture in the soil for long-term food and water security. They also help deal with storm water run-off, and reduce erosion by slowing down the flow of water. As water flows downward, the berm interrupts and collects it in the level bottom. Water fills up the swale, the mound passively soaks it up, and forms an underground water lens of moist soil. This hydrates the soil and sub-soils below and boosts the effectiveness of horticulture and agroforestry. As the water percolates downward, it eventually hits the bedrock and moves horizontally, accumulating at the bottom of the lower slopes. Over time, this creates new springs, recharging aquifers and creating a natural water resource.
The website goes into more detail about building a swale. The site, also, describes many other practical applications of permaculture design. It is definitely worth a visit. I’ll, certainly, be going back.
Standing on pond ice, south of “spring” looking upslope toward orchard (top and upper left corner of pic) on 1/9/2017
As for the hole in the ice, we’ll keep watching. ..maybe some of us more closely than others!
I’m interested in alternative theories! Send me a note!