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The land , as in Chile , owes its fertility entirely to artificial irrigation ; and it is really wonderful to observe how extraordinarily productive a barren traversia is thus rendered . Keep in mind that the majority of watering problems , assuming a well-prepared site , occur from too frequent irrigations rather than too much water applied at any one time . For example , a British officer I spoke to described how his PRT helped rebuild a local irrigation network . Two well-timed seasonal irrigations of 4 inches per application or the equivalent are adequate in normal years for good yields of medium maturity hybrids . Frequent , light irrigations are not recommended since they keep the foliage wet and provides favorable conditions for diseases to develop . Prompt , post-treatment irrigation is especially important for sprays ; once spray residue dries on foliage , it cannot be washed into the root zone by later drenching . For the Bhaka Dam in India , the estimated multipliers are somewhat lower ; in the range of 1.78 and 1.90 depending on the assumptions about ( i ) the seepage of water from canals can have on the availability of groundwater for irrigation , and ( ii ) the availability of additional thermal power in the absence of the Bhakra Dam . Initiating more frequent irrigations will maintain a too wet soil surface and wet foliage , which could cause greater incidences of white mold development . Another purpose is to provide example analyses which can help in managing the accuracy of irrigation water delivery . The Presidency had a long history of irrigations development in the Kaveri basin and this had been a subject of controversy for over a hundred years .