During high floods, to prevent water from spilling over gates, a wall extending from the pond level to the high flood level is installed across the regulator, resting on piers and resisting water pressure by its weight, known as _____________________?
Show answer Hide answer
Answer: C. Breast wall
Explanation
A breast wall is a vertical wall installed above regulator gates to retain water. It resists high flood pressure by its own dead weight while spanning across piers. This prevents floodwaters from overtopping regulator gate structures during extreme events. Barrages and regulators use gates to control water levels during normal river flow periods. During massive floods, water levels can rise above the top of closed barrage gates. Breast walls extend the effective barrier height safely up to the high flood level mark.
Civil engineers design breast walls to withstand immense hydrostatic pressures during peak floods. Reinforced concrete construction ensures these walls remain stable under combined water loads. Proper regulator design protects upstream communities and ensures safe passage of extreme floods. Retaining wall is a general structural term for earth retention rather than barrage flood control. Divide wall separates a barrage pond into distinct bays for silt management and regulation. Cantilever wall refers to a structural retaining wall type relying on a base slab lever arm.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
Related questions
Q1. A Pitot tube is a device that converts the velocity head of flowing water into pressure head by ____________________?
Show answer Hide answer
Answer: A. H = v2/2g
A Pitot tube relates flow velocity to stagnation head using the relation H equals v squared over 2g. It converts kinetic energy of flowing fluid into potential static pressure head. Equating velocity head to pressure hea...
Q2. Rabi crops correspond to ___________________?
Show answer Hide answer
Answer: D. Winter season
Rabi crops correspond to agricultural crops that are sown in the winter season and harvested in spring. Winter temperature and precipitation patterns provide optimal growing conditions for traditional Rabi crops. Agricul...
Q3. Modern hydraulic structures are designed incorporating flow nets, a concept introduced by __________________?
Show answer Hide answer
Answer: B. Khosla
Khosla introduced the use of flow nets based on potential flow theory. Flow nets graphically solve Laplace equations for two-dimensional seepage under hydraulic structures. This analytical approach revolutionized how eng...
Q4. Specific gravity is defined as the ratio of a liquid's specific weight to that of pure water at standard temperature and pressure; therefore, specific gravity equals ___________________?
Show answer Hide answer
Answer: A. 1.0
Specific gravity is the ratio of a liquid density to pure water density. Since pure water is compared against itself, its specific gravity equals exactly 1.0. This dimensionless ratio provides a convenient reference stan...
Q5. The relative tendency of one soil to erode compared to another under identical conditions is termed __________________?
Show answer Hide answer
Answer: B. Erodibility
Erodibility refers to the relative susceptibility of a soil type to detach and be transported by water or wind forces. Comparing different soils under identical erosive forces determines their respective erodibility inde...
Q6. The permissible water velocity through a concrete-lined tunnel is typically __________________?
Show answer Hide answer
Answer: B. 4 – 5m/sec
Concrete lined tunnels handle speeds between four and five meters per second safely. Higher velocities cause severe erosion while lower velocities promote unwanted sediment deposition inside channels. Engineers carefully...