The purpose of this study is to describe the processes through which conceptual models of flow and transport in the fractured vadose zone are developed, tested, refined, and reviewed.

This volume
• describes the present status of conceptual model building in the fractured vadose zone;
• provides guidance to regulatory agencies on the review process for conceptual models developed for site licensing;
• compiles knowledge and experiences
• from related disciplines so that technical communities can benefit from advances in related fields;
• identifies future research needed to advance the technical basis for developing and evaluating vadose zone conceptual models.

Contents
Preface
Executive Summary
Panel Report
1 Conceptual Models of Flow and Transport in the Fractured Vadose Zone
Technical Papers
2 Development of the Conceptual Model of Unsaturated Zone Hydrology at Yucca Mountain, Nevada
3 Conceptual Model of Vadose-Zone Transport in Fractured Weathered Shales
4 Evaluation of Conceptual and Quantitative Models of Fluid Flow and Chemical Transport in Fractured Media
5 Uniform and Preferential Flow Mechanisms in the Vadose Zone
6 Modeling Macropore Flow in Soils: Field Validation and Use for Management Purposes
7 Free-Surface Films
8 What Do Drops Do? Surface Wetting and Network Geometry Effects on Vadose-Zone Fracture Flow
9 Investigating Flow and Transport in the Fractured Vadose Zone Using Environmental Tracers
10 Lessons from Field Studies at the Apache Leap Research Site in Arizona
11 Parameterization and Upscaling in Modeling Flow and Transport in the Unsaturated Zone of Yucca Mountain
Appendixes
A: Workshop Attendees
B: Invited Presentations
C: Panel Biographies
COLOR PLATES

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