Two climate indices i.e., Modified Fournier Index (MFI) and Bagnouls-Gaussen aridity Index (BGI) are combined to map erosivity for Rawal watershed.MFI, for each climate station, is calculated by considering total monthly precipitation, Pi (mm) and mean annual precipitation, P and number of years, b using Eq.
Bagnouls- Gaussen aridity index was then calculated using Eq.
The results are synthetically presented in Figure 2, where the blackened spaces correspond to an aridity index
that is higher than 6.
Climatic stress due to high temperatures and droughts are characterized as crop growth index and aridity index
Since rainfall peaks at 1000 m and potential transpiration reaches a maximum at 2500 m, the aridity index is highest at elevations [greater than] 2000 m (Fig.
4) suggest that the higher elevations in equatorial and tropical mountains are generally characterized by a higher climatic aridity index than are middlelatitude alpine environments.
To evaluate the thermal comfort and design right from the signs used in the two categories in the table shown below (this index are indicators of moisture that H is displayed and Aridity index
with A shown a)
which [I.sub.A] is De Martonne aridity index
, P is the total annual precipitation (mm), and [T.sub.a] is the mean annual air temperature ([degrees]C).