It is imperative for a daily water budget model to have accurate daily precipitation data from a gage representative of the field being simulated. Most climatic data files do not distinguish the form of precipitation being either rain or snow, thus air temperature data are necessary to estimate snow accumulation and melt to have an appropriate time distribution of the available water to the infiltration process.

Irrigation can also be a major water source to the field hydrology and a separate routine allows for this data input. Irrigation water is budgeted much the same as precipitation. Details of irrigation scheduling and budgeting are provided in a later section.

Field Hydrologic Processes | Infiltration | Potential ET
Interception | Soil Water Evaporation | Plant Transpiration | Crop Water Stress
Root Water Uptake | ActualET | Soil Water Redistribution | Irrigation