the operating mode model of the 2d stream to express the relation between the mass rate, elevation and gravitational acceleration
(Forall (?Self ?Time) (=> (Active ?Time 2d-Stream-Potential-Energy ?Self) (= (Lambda (?T) (If (= ?T ?Time) (Value-At (Pe-Rate (2d-Stream-Involved ?Self)) ?T))) (* (Lambda (?T) (If (= ?T ?Time) (Value-At (Mass-Rate (2d-Stream-Involved ?Self)) ?T))) (Lambda (?T) (If (= ?T ?Time) (Value-At (Stream-Elevation (2d-Stream-Involved ?Self)) ?T))) (Lambda (?T) (If (= ?T ?Time) (Value-At (Acceleration-Due-To-Gravity ?Self) ?T))))))) (Forall (?Self ?Time) (<=> (Active ?Time 2d-Stream-Potential-Energy ?Self) (And (2d-Stream-Potential-Energy ?Self) (Active ?Time 2d-Stream-Operating-Mode ?Self) (Active ?Time Earth-Bound-Model ?Self))))
(Forall (?Self ?Time) (=> (Active ?Time 2d-Stream-Potential-Energy ?Self) (= (Lambda (?T) (If (= ?T ?Time) (Value-At (Pe-Rate (2d-Stream-Involved ?Self)) ?T))) (* (Lambda (?T) (If (= ?T ?Time) (Value-At (Mass-Rate (2d-Stream-Involved ?Self)) ?T))) (Lambda (?T) (If (= ?T ?Time) (Value-At (Stream-Elevation (2d-Stream-Involved ?Self)) ?T))) (Lambda (?T) (If (= ?T ?Time) (Value-At (Acceleration-Due-To-Gravity ?Self) ?T))))))) (Forall (?Self ?Time) (<=> (Active ?Time 2d-Stream-Potential-Energy ?Self) (And (2d-Stream-Potential-Energy ?Self) (Active ?Time 2d-Stream-Operating-Mode ?Self) (Active ?Time Earth-Bound-Model ?Self))))