The annual rain varies from the past compared to the future 2 time interval with trendline. The average annual rain the entire central basin since years. R. 1973 – 2012 (b.e. 2516-2555), it was found that there was an average of approximately 1165 mm per year, and are likely to increase by a rate of 2 mm per year, and is the standard deviation 156 millimeters of rain annually, while the volume in the near future years. Expire in 2015-2034 (2558-2577), of the watershed is approximately average 1261 mm per year, but the rate is likely to decline by 10 millimeters per year and have a 175 mm and standard deviation of the annual quantity of precipitation in the far future, 2040-2099 (2583-2642), with an average of about 639 mm per year.There is a tendency relatively constant and has a standard deviation that is 79 mm, although data from the past, with the annual increase in the quantity of rain is predicted rain, but the future of the central basin were likely to decrease in the far future, there is a trend in the reduction of annual precipitation is less than the quantity in the near future. Display: Figure 2-1.
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