Streams not wholly alluvial - alluvial streams, Civil Engineering

Streams Not Wholly Alluvial

In streams which are not wholly alluvial, consisting of bed of pebbles, rock, etc. the liner waterway is kept equal to the actual surface width of the stream, measured from edge to edge along the high flood level line.

Streams with Rigid Boundaries

The bridge should span from bank to bank, measured along the high flood level line.

Streams which Overflow the Banks

In streams which overflow the banks, the waterway is kept equal to the Lacey's regime width and the river is provided with guide bunds to train the flow.

Span Arrangement

The number of spans and the span length are decided on the basis of the well-known thumb rule that the cost of the superstructure equals the cost of the substructure and foundations. Roughly, the span is 1.5 times the height of the pier from the bottom of the foundation to the top of the pier.

Clearance

Clearance is provided above the high flood level upto the levels where bearings are fixed for accommodating any trees floating along the river. The clearance depends upon the discharge, and varies from 0.15 m for small discharge (upto 0.3 cu m per sec) to 1.5 m for discharge over 3000 cu m per sec.

Posted Date: 1/22/2013 6:48:15 AM | Location : United States







Related Discussions:- Streams not wholly alluvial - alluvial streams, Assignment Help, Ask Question on Streams not wholly alluvial - alluvial streams, Get Answer, Expert's Help, Streams not wholly alluvial - alluvial streams Discussions

Write discussion on Streams not wholly alluvial - alluvial streams
Your posts are moderated
Related Questions

Q. Illustrate Shaft grouting for friction barrettes? For the construction of friction barrettes, some grout pipes are designed at periphery of the barrettes. Within a short dur

Define Dual frequency and colour fathometer - Sounding/Sensing Devices? Dual Frequency and Colour Fathometers can be used to detect refill in the scoured area since more than o

In addition to its own weight, the beam in Figure is to carry a uniformly distributed live load of 12 kN/m. Figure 1 also shows the cross-sectional details of the beam. Design a

Analyse the state of stress at the critical section: A prismatic bar of circular section with 80 mm diameter is subjected to bending moment of 5 kN-m and a torque of 7 kN-m. A


Q. By which Materials Shank of a spur construct? Shank of a spur is constructed of sand core and its exposed faces are protected by stone pitching. The attack at nose is very h


ADVANTAGES AND DISADVANTAGES OF SINGLE FLUMESH BOUND

i need simple ans for this question tell me precaution of dampness