The result
is maximum rainfall in Rayong, from historical data. 10 years ago (2003 to 2015) with the highest value at 148.7 mm. In 2014, which was used in the design, change the size of the U-ditch at area WW, which is area received rain water = 352 M2. or convert to volume is 0.0138 m3 / s (49.68 m3 / hr)
and the calculation of the size of the U-ditch to get the water up to 0.0162 m3 / s (58.32 m3 / hr)
, which. enough to accommodate drainage.