44 Quantity of Water Consumed in Irrigation. 



various mistakes, instead of a profit of 5 or 10 per cent, only 

 J per cent, is realised, or, perhaps, the working expenses not 

 even covered. These things have happened in India and 

 elsewhere. It is not much consolation to be told that in 

 20 years' time the estimate may be fulfilled ; and yet it is on 

 results given by old canals, without proper correction, that 

 estimates for new ones are often based, forgetting that 

 usually it takes several years for irrigation to become fully 

 developed. 



