Afflux on account of obstruction to flow, Civil Engineering

Assignment Help:

Q. Afflux on account of obstruction to flow?

Even if the river constriction on account of approach banks is not excessive and bridge waterway is wider than that causing critical discharge intensity, afflux can still be generated due to obstruction to flow by piers. Separation eddies forming at such obstructions result in loss of head which shows as afflux upstream of the bridge.

h = [(V2 / 17.88) + 0.01524] [(A/a)2-1]

wherein h is afflux in m, V is velocity in m/s in unobstructed stream, A is unobstructed sectional area of the river in m2 and a is obstructed sectional area of the river in m2. Other formulae in wide use are due to Negler and Yarnell.

More recently, the Bureau of Public Roads U.S.A., have adopted procedure for estimation of afflux detailed in Hydraulics of Bridge Waterway.

 


Related Discussions:- Afflux on account of obstruction to flow

Equipments required for under water inspection of bridge, Define Equipments...

Define Equipments and tools required for under water Inspection of Bridge? Since the underwater inspection of stone masonry substructures involve only a cursory inspection of t

Harbour layout, Harbour Layout: A harbour has the following constitue...

Harbour Layout: A harbour has the following constituent parts: (a)        An entrance channel, 100-300 m wide (b)       A turning basin, dia 400-600 m (c)        A b

Importance of general and subsidiary rules, Q. What is the importance of Ge...

Q. What is the importance of General and subsidiary rules. What is the main differences between the two. Ans.- Importance of General and subsidiary  rules - General and su

Settlement due to reduction in volume of soil, Q. Settlement due to Reducti...

Q. Settlement due to Reduction in Volume of Soil? The weight of the structure causes reduction in volume of soil due to expulsion of pore water from the voids. This reduces the

What is the external load acting on a pre-stressed beam, What is the extern...

What is the external load acting on a pre-stressed beam In the elastic range, a variation in the external load acting on a pre-stressed beam results in a change in the location

Illustrate the concept of load balancing, Concept of load balancing In ...

Concept of load balancing In above cases of concentric and eccentric pre-stressing, straight tendon profiles (or tendon shapes) along the beam span have been considered. If a t

Benchmark, 1. Where permanent bench of india located ? 2. use of Permanent ...

1. Where permanent bench of india located ? 2. use of Permanent BenchMark ?

Important parts of road pavements, Important parts of road pavements: ...

Important parts of road pavements: Prime Coat : Application of a low viscosity bituminous binder over a granular base to fill up the voids. Tack Coat : Application of b

Loss of camber in steel girders, Steel triangulated (open web) girders are ...

Steel triangulated (open web) girders are provided with camber to compensate for deflection under load. Out of the total design camber, the part corresponding to dead load is calle

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd