The GASR (Group of Aerodrome Safety Regulators) proposed the following (see GAR Subpart F – Physical Characteristics):
(f) Runway surface texture
(1) The average surface texture depth of a runway should be more than 1.0 mm, or the surface should be grooved.
(2) Grooves that should meet the requirement for good breaking action when the surface is wet, should be cut with a tool that leaves a clean cutting edge, the width of each groove should be 5 – 7 mm and the spacing between grooves should be approximately 125 mm.
(3) The average surface texture depth and/or grooving of a runway should be given in the AIP for the aerodrome together with data on surface type (class A, B, C, D or E).
(4) Surface texture shall be measured periodically. If the runway is grooved, the grooves shall be checked periodically for evenness and depth.
GASR does not limit these requirements to new surfaces (like ICAo now does) but also considers existing runways (if I read the GAR text correctly). This GASR work will be adopted by EASA for their Aerodrome Regulation.