Suppose a large dam reservoir is located downstream of the confluence of two rivers. Each river catchment has a large drainage area and is monitored by rainfall and flow gauging stations at its outlet...

Suppose a large dam reservoir is located downstream of the confluence of two rivers. Each river catchment has a large drainage area and is monitored by rainfall and flow gauging stations at its outlet and upstream. On the basis of this hypothetical scenario, is it possible to conceive a multivariate model to predict inflows to the reservoir? Which difficulties do you expect to face in conceiving and implementing such a model?