A fracture network model has been to simulate transient fluid flow behavior in a fractured rock mass. Included is a pressure-dependent aperture, submodel to simulate behavior often sen in fractured systems. The model is used to simulate data from the Fenton Hill Hot Dry Rock (HDR) geotlmmal resmroir. Both low-presswdlow-flow-rate and high- & Ltv- ~Ip-5 pressurehigh- flow- rate transient data are adequately simulated. The model parameters obtained suggest ways in which the model can be refined to achieve even more redistic fits to the data.

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