Explain the unit hydrograph method, Civil Engineering

Assignment Help:

Q.- Explain the Unit hydrograph Method for estimation of peak flood discharge in a river.

Ans.-

Unit hydrograph Method

A hydrograph is a representation of hydraulic characteristic of river discharge . A point on the hydrograph shows the available discharge at that time . The area under the hydrograph came between any two intervals of time say t1 to t2 shows the volume of water that has passed the measuring point in time t1 to t2.

A concept of unit hydrograph is based on the fact that for a given point in a given stream of a basin the storm of different intensity but of the same unit duration produces hydrograph of surface run off of equal length of time and of the similar shape. The ordinates are proportional to the magnitude of rain fall with the assumption that the rain fall is distributed uniformly over the entire area.

The unit hydrograph is thus defined as the hydrograph which is produced by a rainfall of given duration uniformly distributed over the catchment and which produces a direct run off volume of a unit depth of 1 cm over the entire catchment area.

Hydrograph method consists of constructing a unit hydrograph or distribution graph for the catchment and then by use of given rainfall data, the hydro graph runoff is calculated.


Related Discussions:- Explain the unit hydrograph method

Application of bitumen to driven piles, Q. Application of bitumen to driven...

Q. Application of bitumen to driven piles? In a certain area of H-piles subjected to ground water table fluctuation, painting is occasionally applied on the surface of H-piles

Poisson distribution function, Poisson distribution function: Let X I ...

Poisson distribution function: Let X I , X 2 , ..., X,& b e n independently and identically distributed random variables each having the same cdf F ( x ). What is the pdf of t

Use of admixtures in concrete, Use of Admixtures in Concrete The use of...

Use of Admixtures in Concrete The use of chemical admixtures may be made in prestressed concrete construction. But the admixture should not contain chlorides in any form. This

Surveying, obstacles in chain surveying

obstacles in chain surveying

Which type of pile cap transfers loads equally to piles, Q. Which type of p...

Q. Which type of pile cap transfers loads equally to piles, flexible pile cap orrigid pile cap? Loads from columns transferring to pile cap persuade tensile forces at the bott

Define the term- erection stresses, Define the term- erection stresses ...

Define the term- erection stresses The creep loss due to live load stress, erection stresses and other stresses of short duration may be ignored. The loss of prestress due to

Solid mensuration, the two sides of a triangle are 17cm and 28 cm long, and...

the two sides of a triangle are 17cm and 28 cm long, and the length of the median drawn to the third side is equal to 19.5. find the distance from an endpoint of this median to the

Forensic structural engineering, i need journals or articles of forensic st...

i need journals or articles of forensic structural engineering

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