4.40. The depth and extent of information provided in the description will be influenced by the disposal facility type and will be more extensive and complex for facilities designed for the disposal of larger quantities and more long lived or higher activity waste. The description for a facility designed for the disposal of very low level waste will be less extensive and complex than one for high level waste. The actual extent and complexity for any particular facility will depend on a number of factors, including the amount of waste, its particular radioactive characteristics, the nature and complexity of the host site and the associated meteorological and hydrological characteristics. A justification for the extent and complexity of the description should be provided as part of the safety case and this should be agreed with the regulatory body as part of the discussions that should take place at the conceptualization of the disposal facility and throughout its development and operation.