time varying recharge in discrete feature elements

Hello all

I want to simulate a karst aquifer in 3D, and I model channels as 1D discrete feature elements. With the join tool I assign the time varying rain values at the top of aquifer. I want to simulate a time varying  concentrated recharge in channels (discrete feature elements), that they are in the second slice. How can I do it?

Thanks

hi,
Pl can u help me
pl can u give me the step by step instructions on how to use the join tool for assigining the time varying recharge
thankx
faby