Patent ID: 8544220

Claim:
A procedure for making a liquid receptacle comprising the following steps: excavating a tank having a bottom and inside walls; preparing a subgrade layer by spreading at least one layer of sand or clay on the bottom of the tank; spreading one or more sheets of a nonwoven fabric over an inside surface of the tank on top of the subgrade layer; installing a waterproofing layer on top of said one or more sheets of the nonwoven fabric; and installing filters, piping, inlets, outlets, and drainage channels as required for proper functioning of said liquid receptacle; wherein the procedure comprises applying a coating layer comprising stones on top of said waterproofing layer on one or more of said inside walls of the tank or said bottom of the tank, all of said stones being entirely or partly coated with a binder, said stones being distributed to create interstitial holes therebetween so to enable water contained in the liquid receptacle to come into contact with said waterproofing layer, so that thrust of the water contained in the liquid receptacle comes to bear on said waterproofing layer.