Can QXdef1 be lower than QXDef0?
In some simulations QXDef1 is lower to QXDef0 and QXDef2 was negative.
Regarding the definition of these variables, described in the J-C Bader's report of 2016, this should not be possible:
To sum up, the best possible satisfaction of the downstream objective cannot sometimes avoid certain total failures QXdef1, corresponding to the lack or excess of flow obtained in the river at the downstream station in relation to the objective QXobj. These total failures QXdef1 are the sum of :
- QXdef0: absolute unavoidable failures due to physical constraints and instructions at intakes and releases, independent of the volumes of water present and reservoir capacities, as well as of the concerted reservoir management method;
- QXdef2: additional failures, of which an unavoidable part, due to the overall lack of reservoir capacity, is independent of the management method, while the other part, theoretically avoidable, is linked to the distribution of the volume of water present between reservoirs and depends on the management method adopted.