Rainfall is generally not evenly distributed in a region, this has an impact on the distribution of rain stations which is also not uniform, thus affecting the engineering design of an area in the future. Sumbawa Regency as an area with hilly topographical conditions also experiences uneven distribution of rain so it is necessary to test the consistency of rainfall data. The method used to test the consistency of this data is the Rescaled Adjusted Partial Sums (RAPS) method. Meanwhile, in determining the number and density of rain stations, various methods can be used, one of which is the Kagan-Rodda method with an output of optimum rain station points representing an area in Sumbawa Regency. The calculation results obtained that the value of the coefficient of variation (Cv) is 24.1, for a 3% allowable error, 64 new stations are needed with a Kagan triangle length of 10.8 km, while for a 5% allowable error it takes 23 new stations with a Kagan triangle length of 17. 8 km. The number of efficient rain stations is 23 stations, taking into account the small overlap of the catchment area between stations and also considering the cost of procuring and maintaining rain station equipment which is still relatively expensive.
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