Runoff Over Pond Surface

Hello,

I am simulating a storm water network in SewerGEMS platform. In my model there is pond which spreads over a large area. 

My question is, does the software calculate the rainwater getting over the pond surface area? or do we have to assigned a dummy catchment which is equal to Pond surface area and connect with the pond with high runoff coefficient (0.9)?

Thanks

Nishadi

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