Step 1: Understanding the Concept:
Prior to the launch of India's first Five-Year Plan in 1951, several major irrigation works (such as run-of-the-river diversion weirs and canal systems) were constructed during the pre-independence era.
Step 2: Detailed Explanation:
Let us analyze the historical development of major irrigation projects across states:
- Tamil Nadu (erstwhile Madras Presidency) led the country in pre-1951 irrigation systems.
The region developed the Cauvery Delta system, the Grand Anicut, and the Lower Bhavani systems, establishing a high density of early canal systems.
- Uttar Pradesh followed with extensive diversion works across major perennial rivers, including the Upper Ganga Canal (1854), the Lower Ganga Canal, and the Eastern and Western Yamuna Canal systems.
- Andhra Pradesh was also a key region for early projects, particularly Sir Arthur Cotton's Krishna and Godavari deltaic system works.
- Madhya Pradesh, with its undulating terrain and seasonal rivers, had fewer major diversion projects completed in the pre-plan period.
Therefore, the correct decreasing order of major irrigation projects completed before 1951 is Tamil Nadu > Uttar Pradesh > Andhra Pradesh > Madhya Pradesh.
Step 3: Final Answer:
The correct order is Tamil Nadu > Uttar Pradesh > Andhra Pradesh > Madhya Pradesh.