Agriculture Water Demand Model

awdm_report_coverMany of the watersheds in British Columbia (BC) are fully allocated or will be in the next 15 to 20 years.

The Agriculture Water Demand Model (AWDM) helps to understand current agricultural water use and helps to fulfil the Province’s commitment under the “Living Water Smart – BC Water Plan” to reserve water for agricultural lands.

The Model can be used to establish agricultural water reserves throughout the various watersheds in BC by providing current and future agriculture water use data.

Climate change scenarios predict an increase in agricultural water demand due to warmer and longer summers and lower precipitation during summer months in the future.



  • Cadastre
  • Land Use Survey
  • Soil Information
  • Climate Information

Model Calculations

  • Crop
  • Irrigation
  • Soil
  • Climate
  • Agricultural Water Demand Equation

Livestock Water Use

Definition and Calculation of Individual Terms used in the Irrigation Water Demand Equation

  • Growing Season Boundaries
  • Evapotranspiration (ETo)
  • Availability Coefficient (AC)
  • Rooting Depth (RD)
  • Stress Factor (stressFactor)
  • Available Water Storage Capacity (AWSC)
  • Maximum Soil Water Deficit (MSWD)
  • Deep Percolation Factor (soilPercFactor)
  • Maximum Evaporation Factor (maxEvaporation)
  • Irrigation Efficiency (Ie)
  • Soil Water Factor (swFactor)
  • Early Season Evaporation Factor (earlyEvaporationFactor)
  • Crop Coefficient (Kc)
  • Growing Degree Days (GDD)
  • Frost Indices
  • Corn Heat Units (CHU)
  • Corn Season Start and End
  • Tsum Indices
  • Wet/Dry Climate Assessment
  • Groundwater Use

Land Use Results

Agricultural Water Demand Model Results

  • Annual Crop Water Demand – Tables A and B
  • Annual Water Demand Reported by Irrigation System – Table C
  • Annual Water Demand by Soil Texture – Table D
  • Annual Water Demand by Aquifer – Table E
  • Irrigated Area by Local Government – Table F
  • Irrigation Management Factors – Table G
  • Deep Percolation – Table H
  • Improved Irrigation Efficiency and good Management – Table I
  • Water Demand for Frost Protection, Harvesting and Other – Table J
  • Livestock Water Use – Table K
  • Climate Change Water Demand for 2050 – Table L
  • Agricultural Buildout Crop Water Demand Using 2003 Climate Data – Table M
  • Agricultural Buildout Crop Water Demand for 2050 – Table N
  • Irrigation Systems Used for the Buildout Scenario – Table O
  • Water Demand by Aquifer for the Buildout Scenario – Table P
  • Water Demand by Local Government for the Buildout Scenario – Table Q