Engineering Hydrology (CE-802 (A)) - Important Questions

Explain the practical applications of hydrology in civil engineering projects such as irrigation, flood control, reservoir planning, drainage, and bridge design.

A watershed of 695 km2 with six rainfall gauges can be divided into Thiessen polygons with the data listed in the accompanying table. Using the total storm rainfall depth listed, find the average rainfall over the watershed by Thiessen polygon method.

Define rainfall mass curve. Explain the procedure for its construction and interpretation with suitable sketch and applications.

What is stream flow? Explain the various methods of stream flow measurement, their principles, and applications.

Describe the construction and working of a double ring infiltrometer with a neat sketch. Mention its advantages and limitations.

Given phi-index and storm data, estimate net runoff, total rainfall and W-index. The observed data for successive 15 minutes period of 105 minutes storm is given and phi-index is 3.0 cm/hr.

Explain steady radial flow to a well in a confined aquifer and apply Dupuit's equation to determine well discharge from drawdowns at two observation wells.

A well of 0.5 m diameter penetrates fully into a confined aquifer of thickness 20 m and hydraulic conductivity 8.2 x 10^-4 m/s. What is the maximum yield expected from this well if the drawdown in the well is 3 m? Assume radius of influence as 500 m.

Given the ordinates of a unit hydrograph of one duration, construct the S-curve hydrograph and use it to derive the ordinates of a unit hydrograph of a different duration.

Calculate DRH ordinates from given unit hydrograph ordinates for a given rainfall excess. Given ordinates of a 6-h unit hydrograph, calculate the ordinates of the DRH due to a rainfall excess of 4.25 cm occurring in 6 h.

Explain the procedure for derivation of Snyder's synthetic unit hydrograph for an ungaged catchment.

Using Gumbel's method with flood peaks known for two return periods, estimate the flood magnitude for a return period of 1000 years.

Define Instantaneous Unit Hydrograph (IUH), explain its characteristics and describe the procedure for its derivation with sketch.

Route a flood hydrograph through a river reach using the Muskingum method with K=8 hours and x=0.25 given initial outflow discharge. The flood hydrograph entering the reach is given in tabular form.

Write a short note on any two: (i) Hydrologic reservoir routing vs channel routing (ii) Causes and control of reservoir sedimentation (iii) Frequency analysis and return period.