can you fit in a bigger one? also think about mozzies. I use this stuff in my ponds to help stop getting bitten to ribbons. Amazon.co.uk User Recommendation
Before you go digging any holes melv .. have you looked in your plot holders handbook (assuming it is rented from the council).
Chances are they wont let you put one in due to health and safety reasons. You wont be there 24/7 to monitor it. Children, animals and other plot holders have to be considered.
With our plots any additions or alterations wanted have to be put in writing and sent to the council. Written permission must be in hand before anything can go ahead.
As someone with no knowledge of this subject, I was still surprised that a pond would be allowed. Council's have these things for folk to grow veg (& maybe flowers) don't they ? Rather than practicing landscaping. I'd have thought there were others willing to take on plots to grow things.
At that size you will be always clearing out blanketweed and algae irrespective of depth unless you have it fitted with a filtering system.
Mosquito's will love it.
After some thought, I wondered about 1/2 burying an old water tank in the ground, forming a rockery out of old bricks and stones around the edges. make a ramp for anything to climb out.
And if anyone asks, its a reservoir for watering plants.
It's barefootin for you melv .. you will feel the frogs before you squash them !
We are all set to go.. two allotments all clean ,tidied and ready for whatever ?
Just waiting on the tomatoes to get a little larger.