NAPSAC Homepage

NAPSAC is the finite-element software package for modelling groundwater flow and transport in fractured rock. A discrete fracture network approach is used to model groundwater flow and the transport of contaminants through the fractured rock. NAPSAC incorporates full 3D model generation and post-processing capabilities. It has the following capabilities:

Fractures can be defined deterministically or stochastically with specified distributions of lengths, strikes, dips and transmissivities
Transmissivity can vary over individual fractures
Calculation of equivalent continuum properties
Flow to or from boreholes and tunnels intersecting the fracture network can be modelled
Contaminant transport can be modelled using particle tracking
Steady-state and time-dependent calculations can be made
2D and 3D calculations can be made

NAPSAC has been developed over a period of more than 10 years, and has been verified extensively. It has been used successfully in many international projects, for example, the OECD STRIPA project. Rigorous tests are applied to each new release. The software is used by companies, universities and government organisations in many countries. It is developed under a quality system that meets the international ISO9001 standard and the TickIT guidelines.
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The current release of NAPSAC is version 8.1. Licences for NAPSAC, and for the GeoVisage visualisation software, are available commercially from Serco Assurance. The software is supported on a wide range of platforms, from desktop computers to high-end workstations and supercomputers.

For more detailed information, and for prices, contact us on gw.support@sercoassurance.com

a high performance software package for modelling groundwater flow and transport through fractured media

The following publications are available online

NAPSAC Technical Summary (539K)

NAPSAC uses efficient numerical algorithms, which enable very large fracture networks (containing hundreds of thousands of fractures) to be modelled. The finite-element method is used to model flows through individual fractures, allowing detailed calculations of the flow to be made in the vicinity of boreholes and on fractures with varying transmissivity.