In semi-arid regions worldwide the vegetation is organized in patches surrounded by bare soil with marked differences in their soil properties that play important roles in runoff and infiltration.  Chihuahuan-Sonoran and Patagonian Monte  deserts regions show floristic similarity greater than that expected from the geographical barriers between them.  These  very similar environments (Logan, 1968; McGinnies, 1968, 1979; Walter, 1971) can ease comparisons of hydrological plot scale estimates obtained at the Patagonian Monte by Rossi and Ares (2012), with observations on composite overland flow) on runoff plots in the Chihuahuan desert(USA). We propose a methodology that focuses on generating thin scale eco-hydrological data and relations at the Chihuahuan desert to compare them with estimates obtained at the Patagonian Monte