Scour protection for Dam No. 7, Monongahela River, Pennsylvania : hydraulic model investigation

Continue on reverse if necessary and identify by block number) Lock and Dam No. 7 , Monongahela River i s a n a v i g a t i o n p r o j e c t l o c a t e d 85 m i l e s from t h e mouth of t h e r i v e r n e a r t h e Pennsylvania-West V i r g i n i a s t a t e l i n e .The dam i s an uncont r o l l e d f i x e d -c r e s t t y p e w i t h a s h o r t h o r i z o n t a l s p i l l w a y a p r o n f o r energy d i s s i p a t i o n .Model t e s t s were conducted on a 1 : 2 5 -s c a l e s e c t i o n model of t h e dam, s p i l l w a y a p r o n , and a s e c t i o n of t h e r i v e r w a l l of t h e l o c k .The purpose of t h e model s t u d y was t o d e t e r m i n e s i z i n g and c o n f i g u r a t i o n of m a t e r i a l s n e c e s s a r y t o p r o t e c t t h e a r e a immediately downstream from t h e s p i l l w a y a p r o n from a d d i t i o n a l s c o u r .A s c o u r p r o t e c t i o n p l a n c o n s i s t i n g of l a r g e g r o u t -f i l l e d f a b r i c bags placed downstream of t h e s p i l l w a y apron and a l o n g t h e r i v e r w a l l of t h e l o c k and a 3 -f t -h i g h s l o p i n g end a i l 1 p l a c e d on t h e e x i s t i n g s p i l l w a y a p r o n was developed.T h i s p