By George W. Annandale
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Extra info for Reservoir Sedimentation
1 0 ) . Fig. 10 Small p a r t i c l e s may b e h i d d e n between l a r g e r p a r t i c l e s and t h e s e influence flow r e s i s t a n c e less than l a r g e p a r t i c l e s . 11. s p a c i n g and shape. In this figure a protu- Consider f o r the absolute Sk Fig. 2 . 1 1 Flow o v e r roughness w i t h d i f f e r e n t s p a c i n g s . roughness k i s t h e same i n b o t h cases, b u t t h e s p a c i n g d i f f e r s . Figure 2 . 1 1 ( a ) s u g g e s t s t h a t f l o w c a n b e c l a s s i f i e d a s "rough t u r b u l e n t " , whereas t h e i r r e g u l a r i t i e s i n F i g u r e 2 .
Metal a Brass, smooth b Steel 1 Lockbar and welded 2 Riveted and spiral c Cast iron 1 Coated 2 Uncoated d Wrought iron I Black 2 Galvanized e Corrugated metal 1 Subdrain 2 Storm drain Minimum Normal Maximum 0,009 0,010 0,013 0,010 0,013 0,012 0,016 0,014 0,017 0,010 0,011 0,013 0,014 0,014 0,016 0,012 0,013 0,014 0,016 0,015 0,017 0,017 0,021 0,019 0,024 0,021 0,030 33 Type of channel A-2. , straight 5 Unfinished, steel form 6 Unfinished, smooth wood form 7 Unfinished, rough wood form e Wood 1 Stave 2 Laminated, treated f Clay 1 Common drainage tile 2 Vitrified sewer 3 Vitrified sewer with manholes, inlet, etc.
The downstream boundary condi- + m. t i o n c a n however n e v e r be f u l l y met s i n c e t h e w a t e r s u r f a c e c a n n e v e r form a r i g h t a n g l e w i t h t h e bed of t h e c h a n n e l . The M2 p r o f i l e can o c c u r a t f r e e o v e r f a l l s o r a t t r a n s i t i o n s between c h a n n e l s w i t h m i l d and s t e e p s l o p e s . The M 3 c u r v e o c c u r s i n zone 3 below t h e c r i t i c a l d e p t h y boundary, y dy/dx + . A t t h e upstream 0 and b o t h s f and F r approach i n f i n i t y , t h e r e s u l t b e i n g t h a t approaches a positive, finite limit.
Reservoir Sedimentation by George W. Annandale