The conclusion of their work is that that the benefits of management or groundwater irrigation will not always be significant, and that they depend highly on economic, hydrologic, and agronomic parameters (Koundouri, 2004). There has been significant discussion in the literature on possible criteria to define when groundwater pumping is detrimental (see Chapter 2, and Llamas and Garrido, 2007). In particular, fighting against stock depletion is rarely found to be appropriate (Giordano, 2009; GWP, 2012).