I have an ambition to capture and sink 100% of rainwater that falls in a particular area of land.
In Hurricane Irene, five to ten inches of rain fell in two days. This was traumatic and terrifying for my part of the world, with many houses being carried away in floods. But Ben Falk didn’t think it was the storm’s fault.
Do you have any no runoff areas you’d like to share about, or ideas, or plans?
I have started by making swales (over the course of a few years I’ve made three thus far) and ponds. The third was started this fall—it’s small right now, no bigger than the last, but it is an important one as it is near the major source of drainage to the land.
Truthfully, every water catchment I have made so far fills up completely during snowmelt. This is similar in magnitude to a big rain storm, and there are few plants around to drink up the water on its course to the rivers. Not only that, but at snowmelt time, the first few inches of soil are thawed out, but everything underneath is still frozen so there can be minimal infiltration at this time. Everything needs to be held in a porous matrix (such as duff, rotting wood, etc.) or water catchment or it will definitely run off.
Not only snowmelt is there to ponder, but also the rain that comes with it and begins washing the snow down into the river! We generally get a big flood every spring and maybe again in summer.
On top of all this we have been in a state of drought for some years now, as the aquifer is depleted. People were worried about not having water in their wells this summer. Let’s turn this around!
I do notice that in the forests, the earth is unlikely to freeze as much as in an open meadow. Even a small amount of tree cover such as some young black locusts, has kept the ground thawed in one area. So clearly trees are helpful not only for evapotranspiration, mulch, hugels and biological water holding, but also for making a good infiltration microclimate!