Preface. List of Contributors. Part A. Hydrological Processes. 1. Doogeology - Linear Theory of Open Channel Flow (J.J. Napiórkowski). Abstract. Introduction. Linearization of the St. Venant Equations. Solution for Finite Channel Reach. The Generalized Linear Channel Response. Simplified Forms of St. Venant Equations. Conclusions. References. 2. Analytical and Numerical Modelling of Unsaturated Flow (Q.J. Wang). Abstract. Introduction. Physics of Soil Moisture Flow. Reduced Form of Richards' Equation. Closed Form Solutions for Constant D and Linear K* Model. Effect of Assumptions on D and K* Functions. A Proposed Hybrid Solution Scheme for Future Research. References. 3. The Hydrology of Milled Peat Production (J.P. O'Kane). Abstract. Introduction. The Peat-Water System. Water Movement in a Peat Column. Boundary Conditions at the Pedon Scale. The Drying of a Layer of Milled Peat. Conclusions. Acknowledgements. References. 4. Role of Active-Passive Scalar Relationships in Evaporation from Vegetated Surfaces (G.A. McBean). Abstract. Introduction. Efficiency of Evaporation. Concept of Active and Passive Scalars. Impact of K E/K H Ratio on Traditional Methods of Estimating Evaporation from Vegetated Surfaces. Concluding Remarks. References. 5. On the Weights of Precipitation Stations (M. Sugawara). Abstract. The Thiessen Polygon Method is Illogical. Weights Should be Determined Considering the Reliability of Observed Data. Weights of Precipitation Stations Should be Determined to Obtain Good Results in Discharge Calculation or Flood Forecasting. How to Determine the Weights of Precipitation Stations. The Problem. The Singular Matrix (Aij). The Method of Principal Axis Transformation. Factor Analysis. Orthogonal Expansion of the Runoff. The Precipitation Weights.