HIGHWAY ENGINEERING
MODULE-IV
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2
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4
HIGHWAY DRAINAGE.
HILL ROAD
ROADSIDE DEVELOPMENT.
ROAD ADMINISTRATION AND FINANCE
Prof. Ujjval J. Solanki
DEPARTMENT OF CIVIL ENGINEERING,
DARSHAN INSTITUTE OF ENGINEERING AND TECHNOLOGY-RAJKOT.
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HIGHWAY DRAINAGE
There are just three factors
necessary for getting good road.
 1) Drainage.
 2) Drainage and
 3) More drainage.
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Cheap drainage Costly pavements
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
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HIGHWAY DRAINAGE
Question in GTU from this topic
(b) Write short note on
i ) Surface drainage
ii) Sub-surface drainage
07
Q.4 (a) What are the essential requirements of a
good highway drainage system?
07
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
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HIGHWAY DRAINAGE
Gradients
As per AASHTO – Quality of drainage is defined on
the basis of maximum period of time during which
water will be removed from the pavement.
Quality of drainage Water removed within
Excellent
2 Hours
Good
1 day
Fair
1 Week
Poor
1 Month
VeryProf.
Poor
Water will not drain
Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
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HIGHWAY DRAINAGE
Surface drainage arrangement.
 Subsurface drainage arrangement.
 Sketches and its design.
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Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
HIGHWAY DRAINAGE
Importance of Highway drainage
 Surface drainage

 Related

Subsurface drainage.
 Related

to road way and adjoining land.
to subgrade
Sources of intrusion of water in the road.
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
HIGHWAY DRAINAGE
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Problems to Pavement due to improper highway
drainage.
 Lowering of stability
 Reduction in strength.
 Variation in volume in case of clayey soil
 Stripping of bitumen resulting -> potholes
 Rigid pavement- Mud pumping
 Shoulder- Reduction in strength.
 Frost action- in case of low temperature.
 Damage
embankments
slope
Prof. Ujjval Solanki,to
Darshan
Institute of Engg. & Technology-Rajkot
Requirement of Good Drainage
Camber ( As per IRC standard-road type
and rainfall)
2
Gradient.
3 Cross drainage work.
4 Side drains.
5 Intercepting drain.- in case of hill road
6 Water table. ( at least 1.2 mt below GL)
7 Highest flood level ( at least 0.6 mt
above H.F.L.)
8 Prof.Adjoining
land.
Ujjval Solanki, Darshan Institute
of Engg. & Technology-Rajkot
1
Surface drainage
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SURFACE DRAINAGE
Longitudinal side drains- incase of
embankment and cutting
2 Catch basin and inlets in urban area.
3 Providing Damp proof course on the road
surface
4 Provide camber
5 Provide sufficient side slope.
6 Provide catch basin parallel to road in case
of cutting
7 Prof.Keep
carriage way +60 cm above HFL.
Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
1
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Cross section of Urban Road –BRT-Rajkot
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SURFACE DRAINAGE
1 By Longitudinal side drain
Case-I Side drain for Road in Embankment
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SURFACE DRAINAGE
1 By Longitudinal side drain
Case-I Side drain for Road in Embankment
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SURFACE DRAINAGE
1
By Longitudinal side drain
Case-II Side drain for Road in Cutting
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SURFACE DRAINAGE
1 By Catch basin and Inlets in Urban area.
Case-I -Catch basin
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SURFACE DRAINAGE
By
Vertical Inlets
in
Urban area.
Case-II –
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Vertical inlet
Design
of
surface drainage system
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
DESIGN OF SURFACE DRAINAGE
SYSTEM
Divided in two phase
1) Hydrologic design
2) Hydraulic design
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
DESIGN OF SURFACE DRAINAGE
SYSTEM
First phase Hydrologic design
Objective:
To estimate the maximum quantity
of water expected to reach the
element of drainage system
under consideration
Q = C i Ad
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
DESIGN OF SURFACE DRAINAGE
SYSTEM
Second phase Hydraulic design
Objective:
3
4
5
Design of drain
Q = A/V
A = Q/V =_____sq.mt
R= A/P
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Subsurface drainage
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
SUBSURFACE DRAINAGE
Removal or diversion of excess soilwater from the sub grade is termed as
subsurface drainage.
Situation or location required Sub
surface drainage
1-Road in cutting
2 Water flowing from hill
3 Water rises through capillary action.
4 Prof.
Road
near drain
Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SUBSURFACE DRAINAGE
1)
2)
3)
Lowering of water table.
Controlling seepage flow.
Controlling capillary water.
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SUBSURFACE DRAINAGE
1) Lowering of water table.- in sandy/
gravelly soil
Prof. Ujjval Solanki, Darshan Institute of
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SUBSURFACE DRAINAGE
1)Lowering
of Water table.
In silty /clayey
soil
Prof. Ujjval
Solanki,
Darshan
Institute of
Engg. &
Technology-
METHODS OF SUBSURFACE DRAINAGE
2 Controlling
seepage
flow
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Drainage of
side slopes in
cutting by
providing
perforated
drains
METHODS OF SUBSURFACE DRAINAGE
1)
Controlling capillary water.
Case –I – Granular capillary layer
Case-II Impermeable capillary cut-off
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SUBSURFACE DRAINAGE
Controlling capillary water.
Case –I – Granular capillary layer
1)
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
METHODS OF SUBSURFACE DRAINAGE
Controlling capillary water.
Case –II – Impermeable capillary cut-off
1)
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
DESIGN OF SUBSURFACE DRAINAGE
Design of filter material
- Have adequate permeability.
- Can resist the flow of fine material ( piping)
Design filter materialTwo important criteria
1) Permeability
2) Pumping
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
DESIGN OF SUBSURFACE DRAINAGE
MATERIAL- DESIGN OF FILTERS
Design step
Step-1 Do sieve analysis- For foundation
soil- Draw GSD curve
Step-2 Find D15 ( Size of foundation soil)
Step-3
To prevent piping
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
DESIGN OF SUBSURFACE DRAINAGE
MATERIAL- DESIGN OF FILTERS
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
CAMBER OR SIDE SLOPE
Sr. Types of road surface
No
1
2
3
4
Cement concrete surface
Thin bituminous surface
WBM surface
Earth surface
Range of camber in
area of rainfall range
Light
Heavy
1.7 %
2.0 %
2.0 %
2.5 %
2.5 %
3.0 %
3.0 %
4.0 %
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
SHOULDER DRAINAGE
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot
Drainage
of
Rotaries
Prof. Ujjval Solanki, Darshan Institute of Engg. & Technology-Rajkot