Step 1: Understanding the Concept:
The Ministry of Water Resources and Central Water Commission classify irrigation schemes based on Culturable Command Area (CCA).
Step 2: Detailed Explanation:
The standard official classification of irrigation projects in India is:
1. Major Irrigation Projects: Culturable Command Area (CCA) $> 10,000\,\text{hectares}$.
2. Medium Irrigation Projects: CCA between $2,000\,\text{ha}$ and $10,000\,\text{ha}$.
3. Minor Irrigation Projects: CCA $< 2,000\,\text{ha}$.
Step 3: Final Answer:
Therefore, a major irrigation project covers an area of $>10000$ Ha.