The soil I’m dealing with is sandy and ponds' surfaces are quite enormous 10 hectares so that, etancheification cost will be important. In this kind of situation what is the best way to estimate construction cost ?
Get the bearing capacity tested of the material at the foundation level that will decide the kind of foundation and its cost the super structure cost will depend on the available local material and lever and then add together for the total cost remember it will be the cost of structure only treatment units cost you can get from the benders.
If we decide the type of treatment plant then, as per the flow diagram we can decide the area of treatment plant. If you increase the depth of water area will be reduced.Then construction cost shall be reduced. If we reduce the Retention time the structural requirement shall be reduced and so the size of the plant shall decided and so cost shall be arrived.