Non negligible STP flows

[Johan.Olanders.0925]

Hello
The river flows in my implemenatation of the Ouse catchment are based on
a simple water balance model correlated with corresponding sub-catchment
area. However preliminary simulation results suggests that the flows
originating from some STPs need to be included to get realistic river
flows, especially in low flow periods.

My plan is to manually add these flows and re-process the source files.

My question is:
Is there an easier solution?

Merry Christmas / Johan Olanders