ANN-AGNPS: A CONTINUOUS SIMULATION WATERSHED MODEL Scott

The A n n u a l i z e d A g r i c u l t u r a l Nonpoin t S o u r c e (ANN-AGNPS) model i s a d i s t r i b u t e d p a r a m e t e r , c o n t i n u o u s s i m u l a t i o n model d e v e l o p e d t o s i m u l a t e t h e b e h a v i o r of w a t e r s h e d or c a t c h m e n t s t h a t have a g r i c u l t u r e as t h e i r p r i m a r y l a n d u s e . I t i s b a s e d on t h e p r e s e n t AGNPS s i n g l e e v e n t model and u s e s e n h a n c e d RUSLE r o u t i n e s . The bas ic components of t h e model i n c l u d e h y d r o l o g y , s e d i m e n t a t i o n , and c h e m i c a l t r anspor t . The model i s c e l l u l a r b a s e d w i t h a l l c h a r a c t e r i s t i c i n p u t s and c a l c u l a t i o n s made a t t h e c e l l l eve l . P r i m a r y c a p a b i l i t i e s of t h e model i n c l u d e e v a l u a t i o n of t h e r e l a t i v e q u a n t i t y and q u a l i t y of o u t f l o w from a w a t e r s h e d i n order t o assess t h e i r p o l l u t i o n p o t e n t i a l , i d e n t i f i c a t i o n of c r i t i c a l areas of n o n p o i n t s o u r c e p o l l u t a n t p r o d u c t i o n w i t h i n a w a t e r s h e d , and e v a l u a t i o n o f t h e e f f ec t s on w a t e r s h e d o u t f l o w by a p p l y i n g a l t e r n a t i v e management p rac t ices on problem areasA p r e l i m i n a r y e v a l u a t i o n of t h e model on a m o n i t o r e d w a t e r s h e d is p r e s e n t e d .