A Save Editor already exists for Factorio. All the liquids are pumped from/into the wagons directly into/from a tank. Since version 0.15.8 the game displays these probabilities to enough precision (using percentage notation) to see usable values for the uranium processing recipe, but if you're still interested, the exact definition can be found in the game's files. Halved Uranium Waste output from Nuclear Power Plant (from 20 to 10 per minute).