JNTU
JNTU B.Tech III WATER RESOURCES ENGINEERING-I Previous Question Paper (January/February - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Highlight the application of hydrology in practice.
Answer
Hydrology finds applications in various practical fields, including:
- Flood forecasting and warning systems for disaster management.
- Water resource management for planning and operation of dams, reservoirs, and irrigation systems.
- Design of hydraulic structures like bridges, culverts, and spillways to withstand expected water flows.
- Groundwater resource assessment and management.
- Urban planning for storm water drainage and flood control.
- Agricultural planning for crop water requirements and drought management.
How do you estimate the missing precipitation record of any rain gauge station?
Answer
The missing precipitation record of a rain gauge station can be estimated using the normal ratio method or the inverse distance method, provided that nearby stations have complete records and are relatively close.
Normal Ratio Method: This method is used when the normal annual precipitation at the station with the missing record is significantly different from those at the surrounding stations. The formula is:
Px = (Nx / n) * Σ (Pi / Ii)
Where:
- Px is the normal annual precipitation at station x (with missing record).
- n is the number of surrounding stations.
- Pi is the normal annual precipitation at station i.
- Ii is the average annual precipitation at station i.
Inverse Distance Method: This method is preferred when the normal annual precipitation at the surrounding stations is within 10% of each other. The formula is:
Px = (1/D) * Σ (Pi / di2)
Where:
- Px is the precipitation at station x for the missing period.
- D is the sum of the inverse squares of the distances from station x to the surrounding stations.
- Pi is the precipitation at station i for the same missing period.
- di is the distance from station x to station i.
State the uses and limitations of unit hydrograph.
Answer
Sign in to view the complete answer paper.
Summarize the methods for finding average depth of Rainfall.
Answer
Sign in to view the complete answer paper.
What is meandering of rivers?
Answer
Sign in to view the complete answer paper.
List the various zones of a storage reservoir.
Answer
Sign in to view the complete answer paper.
Write about the vertical distribution of ground water.
Answer
Sign in to view the complete answer paper.
Differentiate Flow and lift irrigation.
Answer
Sign in to view the complete answer paper.
Name the two different types of silt theories.
Answer
Sign in to view the complete answer paper.
What is the difference between the lake and a canal?
Answer
Sign in to view the complete answer paper.
Part B
Explain in detail about “Hydrological cycle” with neat sketch.
Answer
Sign in to view the complete answer paper.
For a drainage basis of 650 km2, isohyets drawn for a storm gave the following data:
| Isohyets (cm) | 40 | 35 | 30 | 25 | 20 | 15 | 10 |
| Catchment area (km2) | - | 35 | 90 | 150 | 320 | 450 | 650 |
Estimate the average depth of precipitation over the basin.
Answer
Sign in to view the complete answer paper.
Describe briefly the various measures to be taken to reduce loss of water due to evaporation in reservoir.
Answer
Sign in to view the complete answer paper.
A 15-hr. unit hydrograph of a catchment is triangular in the shape with a base width of 154 hr and peak discharge of 30m3/s. Calculate the area of the catchment.
Answer
Sign in to view the complete answer paper.
Describe the factors affecting for infiltration rates.
Answer
Sign in to view the complete answer paper.
Derive an expression for the yield of an open well using Recuperation test.
Answer
Sign in to view the complete answer paper.
A well is to be constructed in a fine sandy subsoil formation. The discharge of the well is anticipated to be 0.006 m3/s under depression head of 6 m. Find the diameter of the well. Given (K/A) for sandy soil = 0.5 m3/hr/m2 of area under depression head of 1 m.
Answer
Sign in to view the complete answer paper.
List the tests to determine the yield of a well.
Answer
Sign in to view the complete answer paper.
A loam soil has field capacity 30% and permanent wilting percentage 15%. The dry weight of the soil is 14 kN/m3. If the depth of the root zone is 1 m, determine the storage capacity of the soil. Irrigation water is applied when the moisture content drops to 15%. If the water application efficiency is 75%, determine the water depth required to be applied in the field.
Answer
Sign in to view the complete answer paper.
What is Consumptive use of water? List the methods by which it is determined?
Answer
Sign in to view the complete answer paper.
A stream of 150 litre/s was diverted from a canal and 120 litre/s were delivered in the field. An area of 3 hectares was irrigated in 12 hours. The runoff loss in the field was 450 m3. Effective depth of root zone was 1.5 m. Determine Water conveyance efficiency and Water application efficiency.
Answer
Sign in to view the complete answer paper.
The monthly run-off volume (in Mm3) for a period of two water years recorded at a stream gauging site are 3, 6, 16, 30, 18, 15, 10, 8, 6, 4, 3, 1, 2, 5, 17, 28, 20, 15, 12, 7, 5, 4, 3 and 2. Determine the size of the reservoir proposed at the gauging site, if it is to maintain an assured supply of 8.33 Mm3/month. The water year may be taken as June to May and assume each month of 30 days. If the reservoir is half-full at the beginning of the year, locate the periods of excess flow and depletion in the reservoir.
Answer
Sign in to view the complete answer paper.
Explain about the design of Irrigation canals by Kennedy’s and Lacey’s theories.
Answer
Sign in to view the complete answer paper.