Rob Irish : To a man with a Hammer, all problems are nails, I had a neighbor with a dump truck won thought all landscape problems could be fixed with fill!
I am going out on a limb here and say that ditches close to the house make more problems then they solve ! All potential rainwater catchment should be
planned for, For the good of the structures foundations all water should be captured or diverted to drain away from the house, and All landscaping should slope
downhill from the foundations walls to sheet surface water away from your house !
If you are truly caught with an embarrassment of riches, could you divert some of your houses runoff towards roadside ditches !
Still, if the Ditches you inherited are not doing their job, we must see if they were or could be modified into Swales or possibly mini terraces on your hillside
This sounds like a simple
permaculture project that got way
over built over dug by an over achiever ! Or this may simply be a case
of Mother Nature taking back her own !
Most Swales are designed to slow the sheeting of water straight down a hill, holding it up within the swale line and allowing it to slowly sink in and raising the
water table at and down hill from that spot !
There is a type of Swale that has a spillway at (usually) one location. These types of Swales are properly designed to trap water off of a terrain feature like the
slope of a hill, slowdown and collect the runoff, and when the water all along the entire Swale starts to fill-up it will overflow at a spillway delivering most of the
collection of water off of that terrain feature to one location !
You can have a whole hillside of Swales delivering all the water to a spill way located at a specific terrain feature that delivers some of its Overfull to a second
lower Swale that channels the water along its contour line to a spillway and a third lower Swale. and on and on lower and lower !
I
So, you have to determine if the ditch digger was just carried away on his job, did not understand the usage of levels to stay on contour, or just did not plan
out a system that properly deals with clay soils !
It is also possible that after a large runoff of water in the spring your previous earth mover may have discovered that the water flowing over a spillway above
your pound was delivering silty, cloudy brown water into his pond, here he needed a settling basin with super filter water plants, reeds, rushes, Cattails!
I am wondering if Someone worried that the cloudy runoff would eventually fill the pond blocked off a spillway at that location !
While luck, and a little willingness to put on a rain suit and go out and walk along the Swale lines, there is not much maintenance needed with well made
Swales properly on Contour lines ! The Spillways however will require lots of attention, and do need to be examined for problems, The fact that the best way
to spot those problems when they are small is to - put on a rain suit and go check on them when they are working !
So To much clay in your soil can interfere with any absorption of surface waters, and this is a special problem require other better trained minds then mine!
It certainly looks like the hillside has great potential for full sun for a good part of the day!
I would start for now at the location where the runoff from the ditches does/does not drain into the pond, see what you can do there to improve or create a
spillway, and then walk the line of the ditch looking for obstructions, tangled branches and leaves, I have seen incredible natural wattle and dab structures
mother nature has made in several flooding conditions and would expect anything, Where possible the up hill side should be protected from collapse with
Rip/rap, groins And gabions ! Other than that, all the spoil from the dig should be tossed to the downhill side and trees and bushes planted below that !
There are a few good
books on the subject of Swales and someone can hopefully mention a few, don't forget to do a Google search here at Permies For
more information!
Take a lesson from the previous try at Swales and terraces, if some one could not do it in a straight line, doing it with heavy equipment in Curves and Arcs
will just be that much harder, and you will be left with a series of interconnected Muck Piles and Gullies, with your top soil as likely as not sitting under fresh
piles of clay and mineral soils, for a couple of years ! Much like clear-cutting only worse !
This is a little outside my field of expertise living between r the Adirondack Mountains and the St. Lawrence River plain in the wet North east, but
I think
you should investigate the potential for what you already have before committing to a large Terraforming operation !
For the Good of the craft ! Big AL