Further details for specifically permeable interlocking pavers (PICPs) by the American Society of Civil Engineers (ASCE), including: base depths, layering specifications, vehicular load requirements etc. can be found in the following standard - [https://ascelibrary.org/doi/book/10.1061/9780784415009 Permeable Interlocking Concrete Pavement, Standard ASCE/T&DI/ICPI 68-18] as well.