I’m about to build an extension to my bungalow. Currently the rainwater runs directly into the public sewer. To comply with building regs I am planning to build a soakaway in the back garden and direct the rainwater into it. The construction of this is going to be a 1mx1mx1m hole filled with rubble.
Should I line the soakaway walls with a geotextile, i.e Polyfelt TS60?
Would it be adequate to cover over the soakaway top with the same geotextile before covering over with approximately 300mm of topsoil?