I'm confused how to make precipitation table by discharge function..

Question

I want to apply rainfall which is based on actual daily precipitation data for 30 days. 
 So I'm trying to make a precipitation table with discharge function.

The unit of precipitation in the data I have is "mm/day" but "m3/day" in the discharge function. 
 Could you please advise what do I have to do?

Vasileios Basas · Answer

Hi there, 
 To convert precipitation data in units of "mm/day" to discharge data in units of "m 3 /day", you will need to know the drainage area of the catchment (basin). You can then use the following formula: 
 
 Discharge ( m 3 /day ) = Precipitation (mm/day) * Drainage Area (km 2 ) / 1000

For example, if the precipitation is 10 mm/day and the basin area is 100km 2 , then the discharge would be: 
 
 Discharge = 10 mm/day * 100 km 2 / 1000 = 1 m 3 /day

Felipe Fonseca · Answer

Dear 치훈 송 , 
 
 Just to add to what my colleague Vasileos refers: In PLAXIS th e discharge function works per m2 (1 m out-of-plane and 1 m length of "horizontal" boundary). Precipitation works for horizontal distances. If you have a slope, inflow in m/d reduces (to zero for vertical slope). 
 
 Kind regards,

Felipe