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

leveling, what are the diff.types of levels used in levlin

what are the diff.types of levels used in levling

Casing has to be left in for mini-piles, Question What are thought in d...

Question What are thought in determining whether casings have to be left in for mini-piles ? Answer Contrary to most of pile design, design of min-piles is controlled

Survey, chaining on level surface

chaining on level surface

What is the specimen thickness, The thickness of a saturated specimen of cl...

The thickness of a saturated specimen of clay under a consolidation pressure of 100 kN/m 2 of is 24 mm and its water content is 20%. On enhance of the consolidation pressure to 20

Strength of materials, Enlongations in solids based on elastic constants

Enlongations in solids based on elastic constants

Explain strain compatibility in mini-piles, Q. Explain Strain compatibility...

Q. Explain Strain compatibility in mini-piles? In designing the axial capacity of mini-piles, grout can be taken into account in the contribution of axial load capacity. Though

Two pegs test, the distance between two pegs M and N is 7,063 as measured o...

the distance between two pegs M and N is 7,063 as measured on a slope. the height measured on the pegs are that M=1.814M and N=0.5687M

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