This paper deals with the sensitivity of distributed hydrological models to different patterns that account for the spatial distribution of rainfall: spatially averaged rainfall or rainfall field.
Moreover, the spatial and temporal distribution of rainfall is not uniform; 70 % of rainfall is distributed over 25%% of the country (Alizadeh 2004).
The amount and distribution of rainfall in Mediterranean localities is variable and unpredictable.
In addition to elevation, another determinant is the annual distribution of rainfall.
The amount and annual distribution of rainfall in a region, especially during certain periods of development, affects local crops.
Because of the uneven distribution of rainfall in different seasons and in different areas, droughts can occur from time to time.
Climatic conditions are markedly different on the Atlantic and Pacific sides of western Panama, especially in the amount and seasonal distribution of rainfall.
The frequency of harvest and the total seasonal yields depend largely on the length of the growing season, the adaptability of the soil, the abundance of sunshine, and especially the amount and distribution of rainfall or irrigation during the growing season.
The orographic effect on the spatial distribution of rainfall over the area is substantial.
The distribution of rainfall is also uneven for both rain seasons.
Accurate prediction of hydrological models requires accurate spatial and temporal distribution of rainfall.
