Equations From the Book

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Chapter 1. The Hydrologic Cycle, Water Resources, and Society

• Descriptive Statistics Equations
• Data Transformations
• Multiple Regression Analysis

Chapter 2. Precipitation (View PowerPoint related to Chapter 2)

• Average Rainfall
• The Hazen Method
• The Weibull Method
• Probability

Chapter 3. Infiltration and Soil Water Processes (View PowerPoint related to Chapter 3)

• Soil Water Relationships
• Infiltration and Soil Water Retention
• Soil Water Balance
• Horton Equation
• Green-Ampt Equation
• Darcy's Law
• Richards Equation
• Stokes Law
• Particle Density
• Hydraulic Conductivity

Chapter 4. Evapotranspiration

• Fick's First Law of Diffusion
• Pan Evaporation
• Soil Water Depletion
• Water Balance
• Actual Vapor Pressure
• Vapor Pressure Deficit
• Extrapolating Wind Speed
• Evaporation from Open Water
• SCS Blaney-Criddle Method
• Jensen-Haise Alfalfa-Reference Radiation Method
• Thornthwaite Method
• Penman's Method
• Crop Actual Evapotranspiration

Chapter 5. Runoff and Subsurface Drainage (View PowerPoint related to Chapter 5)

• 100-Year Recurrence Interval Discharge
• NRCS Curve Number Method
• Graphical Peak Discharge Method
• Time of Concentration and Lag Time
• The Rational Equation
• USGS Empirical Regression Models
• Unit Hydrograph Methods
• Ellipse Equation for Subsurface Drainage Flows

Chapter 6. Stream Processes (View PowerPoint related to Chapter 6)

• Lane's Channel Stability Model
• Stream Orders
• Law of Drainage Areas
• Channel Patterns (Slope, Width, Depth, Velocity)
• Shear Stresses and Tractive Force
• Sediment Transport Rate
• Meyer-Peter-Muller Equation
• Meander Migration, Floodplains, and Streamways
• Rosgen Stream Classification Method

Chapter 7. Uniform Open Channel Flow (View PowerPoint related to Chapter 7)

• Continuity and Manning's Equation
• The Darcy-Weisbach Equation
• Stream Power
• The Value of Manning's n

Chapter 8. Hydraulic Control Structures

• Specific Energy and Critical Discharge
• Weirs, Flumes and Culverts
• Routing Flows Through Rivers or Channels
• Routing Flows Through Reservoirs
• Stage-Storage Relationships
• Detention or Residence Time
• Sediment Storage in Management Ponds
• Spillways

Chapter 9. Soil Conservation and Sediment Budgets

• The Universal Soil Loss Equation
• Downstream Sediment Yields
• Single Event Sediment Yields

Chapter 10. Hydrology of Forests

• Characteristics of Snow
• Interception-Rain, Snow, and Fog
• Energy Balance in Forests
• Snowmelt
• Subsurface Flow (Interflow)

Chapter 11. Hydrogeology

• Groundwater Flow
  • Darcy's Equations
  • Transmissivity
  • Specific Yield
  • Storage
  • Average Linear Velocity
• Flow to Wells
  • Mass Balance Using Darcy's Law
  • Theis Equation
• Capture Zones of Wells

Chapter 12. Human Impacts on the Hydrologic Cycle: Prevention and Treatment Strategies (View PowerPoint related to Chapter 12)

• Sizing Detentions Ponds to Improve Water Quality
  • Rational "C" Coefficient
• Wetlands as Treatment Systems
  • Detention Time
  • Hydraulic Loading Rate
• Leachate Management in Landfills

Chapter 13. Fundamentals of Remote Sensing and Geographic Information Systems for Hydrologic Applications

• Projected Source Area
• Solid Angle
• Radiance
• Spectral Relative Units