Asian Agri-History Vol. 9, No. 4, 2005
283small simple earthworks on minor streams to retard and spread floodwaters into clay- based ponds.”
The well-planned and elaborated irrigation system which was analogous to the tanks of peninsular India (Fisher, 1966), facilitated both the extensive and the intensive agricultural practices and ensured power and prosperity of the Angkorian rulers who made regular endowments to the religious establishments (Hall, 1992). This
system of water utilization, as revealed from the study of aerial photography by Bernard Phillip
Groslier, was designed to solve the problem posed by too much and too heavy monsoon rain within too short a time A renowned historian, D GE Hall, who quoted the findings of Groslier’s study in his authenticated
historical account, further referred to the storage tanks (
barays) one of which, had the capacity of 30 million m
3
,
capable of conserving enough water to meet the requirements of irrigation and drinking water around the Angkorian city. This region measuring about 12.5 million acres
(about 5 million ha) was divided
into square paddy fields, which were capable of yielding three, and even four harvests a year (Hall. Besides preventing soil erosion, the waterworks regulated the annual inundation and provided an efficient and effective means of travel and transport all through the year. The vast intricate system of reservoirs and canals, besides
ensuring economic prosperity, supported about 4 million Khmer population (Ng Shui Meng, 1974). The frequent Thai invasions and the disenchantment of the public with the rulers led to the breakdown of Khmer irrigation system which in turn culminated in the decline of Khmer political power from the beginning of 15
th century (Munirathnam
Reddy, 1998). The end of Angkorian history, as Taylor (1992) lamented, came not with a dramatic collapse but rather as a reorientation of Khmer policy which grossly neglected the rice fields.
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