Description: Layer showing current availability of gravel on the Canterbury rivers for river-based gravel extraction. Produced with river survey cross sections, data to calculate the volume of stored gravel in the riverbed, and known active consents for gravel extraction.Data contains information such as:Cross Section IDRiver NameDistance from the coastlineGravel availabilityMessagesLink to more informationLast survey dateLast gravel calculation dateNext calculation dateNumber of current consents