This theme is used for documenting water afflux at the tunnel wall and allows to collect the related hydro geological parameters over time. Besides common parameters like amount of water afflux, temperature, PH value or conductivity all parameters from hydrological analyses can be appended. All collected data can be presented as diagrams and optionally be evaluated in conjunction with the advance status of each construction phase.

Using this theme the amount, physical and chemical characteristics of water caught in the tunnel or at the tunnel portal can be documented in the 2doc database. Especially with descending drives and larger amounts of water afflux the documentation of the water amount and the water characteristics can be important for accounting. The documentation of physical and chemical characteristics of the caught water often play an important role when dealing with environmental regulations (water treatment etc.). Besides the documentation of water caught in the tunnel 2doc also allows the documentation of water used for construction and coming from outside the tunnel - this data is used to create pristine evaluations of water amounts coming from within the tunnel. Together with the theme Tunnel water afflux a precise documentation and evaluation of water drainage in the tunnel is possible.