Inflation Rate in India averaged 8.14 percent from 2012 until 2015, reaching an all time high of 11.16 percent in November of 2013 and a record low of 3.66 percent in August of 2015.
Dugout costs will vary according to each site and its soil and moisture properties. The average cost for excavating, landscaping, and installing inlet control on a dugout of 50m x 20m x 5m deep (with a capacity of 2 million litres) is $4,000 to $7,000.
Guesstimate of water park construction costs: $100 million. Current value of the 25,000 acres in today's dollars is roughly $1.25 billion at an average price of $50k per acre in that market. Cost for the roughly 26,000 hotel rooms would have to be at least $2.6 billion.