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Groundwater Conditions: <br />Liters per 10 m of tunnel length Or Water Pressure <br />Inflow (liters per 10 m) Notes: <br />Dry, Damp, <br />OR Water Pressure None Dripping, etc <br />Discontinuity Persistence <br />Set 1 Set 2 Set 3 Set 4 Set 5 <br />Very Low (6) <1m ( <3.3 ft) Notes: <br />Low (4) 1- 3 m (3.3 - 9.9 ft) X <br />Medium (2) 3 -10 m (9.9 - 33 ft) X X X <br />High (1) 10 - 20 m (33 - 66 ft) X X <br />Very High (0) >20 m ( >66 ft) <br />Discontinuity Separation (Aperture) <br />Set 1 Set 2 Set 3 Set 4 Set 5 <br />Very Tight Joints (6) <0.1 mm (< 0.003 in) <br />Tight Joints (5) 0.1- 0.5 mm (0.003 - 0.02 in) X X X <br />Moderately Open Joints (4) 0.5 - 2.5 mm (0.02 - 0.1 in) X X X <br />Open Joints (1) 2.5 -10 mm (0.1- 0.4 in) <br />Very Wide Aperture (0) >10 mm (> 0.4 in) <br />Discontinuity Roughness <br />Set 1 Set 2 Set 3 Set 4 Set 5 <br />Very Rough Surfaces (6) VR Notes: <br />Rough Surfaces (5) R X X X <br />Slightly Rough Surfaces (3) SR X X X <br />Smooth Surfaces (1) SM <br />Slickensided Surfaces (0) SL <br />