description 2.1. Crop Season description 2.2. Crop types description 2.3. Base Hour /Base period description 2.4. Kor hour and kor depth description 2.5. Crop Hour/ Crop period description 2.6. Duty and Delta description 2.7. Delta-Duty Relationship description 2.8. Factors affecting Duty description 2.9. Water Requirement for different crops description Numericals description Chapter 2 Water Requirements