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Perforated Pipes and Pond storage Infiltration rate

We have proposed storm water pipes with perforations on Top half of the pipe periphery. The ground water table is below the pipe profile and with a minimum separation distance of 1.5m. The only source for infiltration is due to extensive landscaping water percolating into ground. How do I input an infiltration rate (say 10% of landscaping demand) along the SW pipe routing. Similarly, how do I model the ground water infiltration rate from pond storage with a separation distance of 1.5m between Pond bed and water table underneath it.

regards,


MHD