Statistical and probabilistic methods for estimating the probability that a fracture is nonconductive (or equivalently, the conductive-fracture frequency) and the distribution of the transmissivities of conductive fractures from transmissivity measurements made in single-hole injection (weil) tests were developed. These methods were applied to a database consisting of over 1,000 measurements made in nearly 25 km of borehole at five sites in Sweden. The depths of the measurements ranged from near the surface to over 600-m deep, and packer spacings of 20-and 25-m were used. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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This mfn* wr prepared e, an aeccunl uf work sponsored by the United Slatas Government. Neither the United Slates nor the United Stnler Department of Energy, nor any of their employccr, nor any of their COntraCtOrS, subcontracton, or their employees, mak& any warranty, exprea, or implied, or anumn any legal llabililv or r t n n n h i l i t y the nooumoy, boni,jl.b,lcr, or uvfulncls of any infomlion, apparatus, product or proccn discloEd, or mpnrenD that i u u p would not infringe primlely owned right,.