By Miloš Holý, Asit K. Biswas and Margaret R. Biswas (Auth.)
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Additional info for Erosion and Environment. Environmental Sciences and Applications
1 Runoff from Liquid P r e c i p i t a t i o n Surface runoff from the slope takes place a t the moment when r a i n f a l l i n t e n s i t y exceeds the i n f i l t r a t i o n capacity of the s o i l . This depends on many f a c t o r s of which the most important are c l i m a t i c c o n d i t i o n s , topography, p h y s i c a l f a c t o r s , i . e . , the morphology of the a r e a , the geographical and s o i l conditions and the composition of the v e g e t a t i v e cover, and the anthropogenic f a c t o r s which have unfavourable e f f e c t s on the water regime of the a r e a .
I n C z e c h o s l o v a k i a t h e p e r m i s s i b l e e r o s i o n r a t e o f s h a l l o w s o i l s ( s o i l l a y e r up t o 30 cm i n t h i c k n e s s ) i s 1 t h a - 1 p e r y e a r ; i n s o i l s w i t h a t h i c k n e s s of 3 0 - 6 0 cm t h e p e r m i s s i b l e r a t e i s 4 t h a " 1 p e r y e a r ; i n deep s o i l s ( s o i l l a y e r 6 0 - 1 2 0 cm i n t h i c k n e s s ) t h e p e r m i s s i b l e r a t e i s 10 t h a " 1 p e r y e a r ; i n v e r y d e e p s o i l s w i t h a s o i l l a y e r o f more t h a n 120 cm i n t h i c k n e s s on l o e s s and c l a y s l o p e s t h e p e r m i s s i b l e e r o s i o n r a t e w i l l be 16 t h a " 1 p e r y e a r .
In Fig. 45 — infiltration is the black coloured space, runoff is the white coloured space). M. Hol^ constructed a nomogram (Fig. 46) for the instantaneous identification of surface runoff intensity which makes it possible to obtain from the recordings on the rain recording gauge, 58 Erosion and Environment divided i n t o time i n t e r v a l s of equal steepness and subsequent i d e n t i f i c a t i o n of the average depth of r a i n f a l l i n these time i n t e r v a l s , the r e s p e c t i v e coordinates of the p o i n t s of the elementary runoff curve.
Erosion and Environment. Environmental Sciences and Applications by Miloš Holý, Asit K. Biswas and Margaret R. Biswas (Auth.)