Please note that Digest 248 is a scanned copy of a paper originally published in 1981, so the text is not as clear as in documents created as pdf files.

Digests 248 and 249 consider the design of unvented above-ground drainage systems for high and low-rise domestic, public and office buildings, based on performance criteria given in BSI Code of Practice, BS 5572:1978 (which has since been replaced by later standards).

This Digest includes a table on the flow rates and frequency of use of appliances: toilets (WCs and urinals), wash basins, sinks, baths, showers, washing machines. 

See Part 2 - Digest 249.