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Today, the water which can be stored in both Bhumipol and Sirikit reservoirs is not
enough for growing dry season crop in the irrigation area downstream. Sakae Krang is the
river branch of the Chao Phraya River shich locates above Chao Phraya Dam, approximately
25 kilometers. The analysis through this research will be the study of the development of
Sakae Krang river basin which may gain more benefit, somehow, the study realizes that the
benefit in Chao Phraya basin will be lost.
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The study carries the data such as the water for land preparation, the irrigation
efficiency and cropping data base on the adjacent project. The study also computes the
effective rainfall by using the mathematical model. This effective rainfall data is going
to be the data for computing the irrigation demand and the return flow from cropping area.
This irrigation demand and inflow which generated by SCS, and NAM model for 37 years of
hydrological record will be the basic data for reservoir simulation study. If DSAR is
applied for determining dry season crop area, the result of the study is shown in the
following table:
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The study both before and afer the development of Sakae Krang river has found that the
development of Sakae Krang river basin may reasonably gain benefit but on the other hand
the area in the Chao Phraya River basin will lose some benefit by the water in Sakae Krang
river basin which to be a part of side flow and used by the Chao Phraya irrigation area.
The number of months which water lost is greater than 5 cms. are 141 months (max 736. 88
cms., min 6.29 cms., ave. 71.69 cms.) for 37 years of hydrological record (1952 - 1988)
and 37 months (max 736.88 cms, min 6.29 cms. ave. 33.53 cms.) for 15 years (1974 - 1988)
after the completion of the construction of Sirikit dam.
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