www.valenza-engineering.com 8 OGNZ - WUG Conceptual Engineered Mitigation of Impact on Surface Water Systems DRAFT Grouting strategy by inflow zone U s e o f H a a c k( 1 ) C l a s s i f i c a t i o n (1) Water Leakages in Subsurface Facilities: Required Watertightness, Contractual Matters, and Methods of Redevelopment. Prepared for the ITA Working Group on Research by Dr.-Ing. A. Haack . Tunnelling and Underground Space Technology, Vol. 6, No. 3, pp. 273-282, 199
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