Friend welcome to another day, hope you're having a good evening.
My name still remains Dr Ekeledo Magnificatfarms/fisheries,Owerri.
The reason for this lecture is to educate us on the proper way to construct pond walls or dykes to prevent erosion.
I decided to post picture plus videos to avoid this network wahala that has always bedeviled it in previous lectures, where I finish lectures and no video /picture to buttress my points.
In construction of pond wall its ALWAYS best to slope it gradually at a 45 or 30degree angle into the pond, this allows gradual water runoff into pond so limiting erosion. It always allows pressure from the top to be gradually disseminated all over the wall without causing pressure to be at one point which weakens the spot so that in event of rainfall it washes/caves in.
In our ponds which are over two plots big there are no SANDBAGS.
In construction of the pond dykes for a smaller fish farm, its good to use the clay from excavation to create layers of which after each layer of about 1/2ft you ram it down and water to ensure evenness . You lay the next 1/2ft layer and onwards till you get to desired height.
Picture1 is a badly constructed pond wall. You can see it's collapsing already.
Ponds are at right angle to pond bottom and that is not good
Picture2 shows photos of a pond wall already collapsed and sandbags used to fortify it.
Now if you don't use bamboos to brace it up from the back there is a likelihood that it will collapse.
To be surely BEST you chain that its stronger and able to withstand water pressure.
Picture3 is a good pond wall/dyke you can see how it gently slopes into the pond so easy to drag in your net and also harvest by creating a landing platform.
You can also see the grass on it to help control force of water runoff so preventing soil runoff.
PLEASE note using sandbags is OK where a mistake has been made but then its quite avoidable because of extra labor concerned that could be avoided if precautions are taken initially.
In the last video we have a pond that its outer side is facing the river that never dry.
There are sandbags from the bottom of pond to the top of the dyke or pond wall, next we have bamboos used to bridge it at intervals acting like columns and the finally we have another set of bamboos used to cross it and join all the column like bamboo sticks (horizontally) with nails or binding wires so as to form a basket
This allows the sandbags to withstand the force of the river speed, Every pond MUST have an overflow.
This ALLOWS water to go out one foot and half from top of pond wall/dyke.The size of overflow should be bigger than the normal drainage point so that during heavy rainfall ,water should move out faster than its coming in so that the pond walls don't carry more pressure/force than it can carry.
This is why gentle slope will withstand such situations beta that 90degree pond walls
Finally the thickness of pond walls or Dykes should be atleast 5ft to 12ft wide to accommodate weight/force of persons,equipment, vehicles etc
Thank you.
Disclaimer: Opinions expressed in comments are those of the comment writers alone and does not reflect or represent the views of Armstrongug
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