Measuring tube (history)

Historical stock with gauge tubes derived from calques, these have been used in the past for the establishment of the primary groundwater quantity measurement network and last updated in 1994. The gauge tubes are, when converting to digital, numbered to map sheet + code + serial number. Renumbering from old to new has taken place in the following way: — All numbers without the addition -L and less than 500: map sheet + P+ number (4 digits). — The numbers with -L and less than 500: map sheet + L+ number (4 digits). — All numbers 500 and above (with or without L): map sheet + D+ number (4 digits). For example: Map sheet 18C, no. 32 18CP0032 Map sheet 18C, nr. L-18 18CL0018 Map sheet 18C, no. 522 18CD0522 The 500 and higher numbering has been awarded by the province the rest by TNO. The 500 and higher coding fell upon inclusion in the TNO database. He then assigned his own number to this.