15 Aug

Cleaning old agricultural wells

There are a number of old stone-lined agricultural wells on this land. They were probably dug between 100-200 years ago, it’s hard to say exactly when, and it depends on who you ask. Suffice to say, they are marvels of creation. The amount of work that went into their construction must have been immense. The dry stone walls that support the sides down to the bedrock are impressive. They were often also dug well into the bedrock, as we discovered when we started cleaning some of them.

Objectives

To clean 2 of the old wells on the land, determine their depth, volume and get a sense for their refill-rate, and improve their water flow. Here is one of the wells in winter, completely full.. full agricultural well in winter   And the same well in summer. The water level is about 2 meters less than in winter. agricultural well in summer

Cleaning flotec submersible pump

Before cleaning a well, it obviously needs to be emptied. We bought an electric submersible pump for this purpose, which can handle murky water with some junk in it. Get the most powerful pump you can afford, it will save you time and actually do the job. It’s important to consider the ‘head’ of the pump, which defines how high it can effectively lift the water. We got this one with a 12 meter head. It emptied the well pictured above, which contained about 15000 liters of water in summer, in 45 minutes. Then the fun really begins. We cleaned two wells about 80 meters apart and the types of sediment at the bottom were completely different. The first contained sandy sludge, whereas the second contained about half a meter of very fine, organic mud. We used a small electric crane to lift bucket after bucket out until it was impossible to really use shovels. To get the rest of the mud out we pumped water back into the well from another nearby well, while using a second pump to remove the muddy water, eventually getting nearly all of the sediment out. Having two pumps made the process far more efficient and thorough. portuguese agricultural well cleaning We also sprayed the sides of the well while draining it, using the well’s own water to wash mud and soil out of the cracks between the rocks that were used to build the inside wall of the well. With more pressure, such as a power-washer would provide, this could have been done even more thoroughly. The first well was dug almost 3 meters into solid granite bedrock as you can see here. An impressive feat. portuguese agricultural well drained for cleaning At the bottom we found several small springs. This well, to our amazement, had almost refilled to the same level from which we drained it within 24 hours, and this in the height of summer with no recent rainfall.

4 thoughts on “Cleaning old agricultural wells

  1. pl. send video, i want remove mud from my 40 feet deep well, you have shown one stand and bucket for mud on picture no.3, i want to made that.
    thanks and best regards,
    So many google search i got it which i want.
    usman shaikh,
    pune Mh India

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>