You have 38.13 mm.year-1 total rainfall

There are 31, 536,000 sec in a year

Therefore, 38.13 / 31,536, 000 = 1.20909x10-6 mm.s-1

Therefore, 1.20909x10-6 / 1000 = 1.20909x10-9 m.s-1

Dear colleague,

There are three parameters to evaluate the rainfall,

rainfall depth, mm

rainfall duration hr.

rainfall intensity m/hr

The rainfall intensity is measured for each rainfall event, because the runoff phenomena depending upon the relationship between the intensity value and the infiltration rate of the soil.

Best Regards

Meter/second is unit of rainfall intensity and you have depth of rainfall, So you have to calculate rainfall intensity by using formula Depth of rainfall/duration of rainfall