Test1: One aquifer consisting out of one layer: SF = 0.505887195
Test2: One aquifer consisting out of two layers: SF = 0.488933683
Test3: One aquifer consisting out of three layers: SF = 0.494302622
Test4: Two aquifers consisting out of one layer each: SF = 0.607742642
Test5: Two aquifers consisting out of aquifer 1 (two layers) and aquifer 2 (three layers):SF = 0.618266507