PROFORMA FOR SURVEY DATA OF BRIDGES

A. GENERAL DATA:
1. Name of the River
Road
Location of bridge site:-Km.
Nearest village and distance
Nearest Railway station and
distance
2. Type of bridge proposed

:
:
:
:
:
:

3. Site:
Proposed alternative sites for investigation with merits and demerits along
with proposal of diversion:
Site-1: at _____________meter U/S or D/S
Site-2: at _____________meter U/S or D/S
Site-3: at _____________meter U/S or D/S
Whether the site is approved by competent authority and when yes/No,
Date...................................
Designation

of

Competent

Authority...............................................................
Note: Competent Authority is Divisional Manager up to 30 Meter, General
Manager 30 Meter to 60 Meter, Chief Engineer beyond 60 Meter
4. Details of GTS Bench Marks:
Location
Value
Reference
5. Details of traffic intensity:
a) Latest traffic intensity.....................................PCUs
b) Likely
traffic
intensity
on
opening

of

the

bridge...................................PCUs

6. Details of rain fall

Source

of

the

information.....................................................................................
Year
Rainfall in mm
2007
.........................
2008
.........................
2009
.........................
2010
.........................
2011
.........................
7. If there is any irrigation/water supply dam on the upstream or down
stream of the proposed bridge site following details may be furnished.
a. Distance from bridge site
: .......................................

b. Full
8. Can

tank

level

of

the

: .......................................
electric
power
be

dam

(with

made

reference

available

for

to

GTS)
bridge

construction: ........................
B. DETAILS OF EXISTING RAIL OR ROAD BRIDGES NEARBY ON THE
RIVER
1. Name of the road of railway line
:
2. Location of the bridge
:
3. Distance from proposed road bridge
:
4. Length of bridge
:
5. Span Arrangement
:
6. Formation Level/ Rail level
:
7. Soffit level
:
8. Overall width of the bridge
:
9. Clear width of the bridge
:
10.Record of flood for previous 10 years
:
(attached separately)
11.Highest flood level ever recorded
:
12.Linear waterway of the river at the bridge at HFL:
13.Type of the foundation and foundation strata
Pier
:
Abutment
:
14.Foundation level
Pier
:
Abutment
:
15.Type of pier
:
16.Type of abutment
:
17.Type of decking
:
18.Present condition
:
19.Year of construction
:
20.Whether the waterway of existing bridge is found
:
to be adequate.
21.Following additional information may be furnished in respect of existing
submersible bridges & causeway.
a) Number of submergence in as year
:
b) Maximum duration of submergence
:
c) Total period of submergence
:
d) Height of submergence
:
e) Length of submergence of road on either side
:
C. PREFINAL DATA
The preliminary data should be collected as per clause 101 of IRC code
section I. Following data is required to be collected.
1. Index Map (Scale 1CM =500m or 1/50000):
Drawing
No. ..............................
(Showing important details
towns/villages etc)
2. Site plan (Scale 1CM = 30m)
No. ........................................

like

River/Nalla,
:

Roads,

important
Drawing

(Showing locations/direction/alignment of River/Nalla bank, water flow

spread line during survey, outcrops of rock in river/nalla bed, existing
bridge and road, proposed bridge (giving distance from existing
bridge),

alternate

sites

(giving

distances

from

existing

bridge)

investigated and rejected giving reasons, L-sections line of river/nalla,

flow of river, angle of skew, cross section line (giving distances from
existing bridge). Boring (with identification no.), Nallas in approaches,
building, places of worships, well, electric/telephonic pole, water supply
pipe line, other obstructions affecting alignment of approaches,
approaches to meet the existing road i/e details of CD structures in
approaches,

permanent

and

temporary

bench

mark

with

reference/coordinates and RLs, centre line reference pillars of proposed

bridge site and approaches (turning point) with coordinates. Name of
nearest town/village on either side, table showing chain age and
bearing/coordinates of reference points.
Note: In case the river/nalla is meandering in the vicinity of
bridge site, two loops either side of the proposed site be
plotted on the site plan.
3. Contour Survey Plan

Drawing

No. .....................................
Existing upstream and downstream of the proposed site up to
100m for CA <3 Sq. Km. (Scale 1 CM = 10m)
300m for CA 3 to 15 Sq. Km. (Scale 1 CM = 10m)
1.5 Km or width between the banks whichever is more for
CA>15 Sq. Km. (Scale 1 CM = 10m).
4. Catchment area plan
Drawing
No. ..........................................
(According to the extent of the catchment)
Scale 1 CM = 500M or 1CM = 2500M)
i)
Certificate of correctness of catchment area and references of
top sheet should be recorded on the catchment area plan by
ii)

Divisional Manager of MPRDC.

Is there any possibility of subsequent changes in the nature of
the catchment area
(Like a forestation, deforestation,
urban development etc.)
If yes give brief report.

: Yes/ No.

5. Longitudinal section
Scale:
Horizontal 1CM = 30m
Verical
1CM = 10m
(One kilometre upstream to one kilometre downstream along deepest
channel with HFL and LWL marked at respective cross section).
6. Cross Sections:
Scale:
Horizontal 1:1000
Vertical
1:100
i)
At proposed site
Drawing
ii)

No. ......................................
At 100/300m Up stream

iii)

No. ......................................
At 500m Up stream
Drawing

iv)

No. ......................................
At 100/300m Downstream
Drawing

v)

No. ......................................
At 500m Up stream
Drawing

Drawing

No. ......................................
Note:1. At least 3 cross sections, at proposed site, one at 100m upstream
and one at 100m downstream for CA up to 3 Sq. Km.
At least 3 cross sections at proposed site one at 300m upstream
and one at 300m downstream for CA up to 3 to 15 Sq. Km.
2. At least 3 cross sections at proposed site, one of 500m upstream
and one of 500m at downstream for CA> 15 Sq. Km.
3. Each Cross section must extend up to sufficient distance beyond the
point where the HFL cuts the normal Ground.
4. Each cross section must include HFL, LWL, and name of nearest
village at each end.
5. Cross Section at proposed site should also include details of boring
marks at respective locations showing the details of strata met with
difference RLs, GL to sufficient distance beyond the point where
formation level cuts the Natural ground.

6. If the difference in discharges, thus calculated, is more than 10%,

the discrepancy has to be investigated; average of these discharges
has to be considered.

7. Water Levels:
Record of the following water levels may be collected:
I.

Flood levels for previous five years, if recorded by any

authority near exiting bridge
Year

II.
III.
IV.
V.
VI.
VII.
VIII.

Flood Level

2011
2012
2013
2014
2015
Highest ever flood level recorded / observed.
Year where HFL occurred.
Ordinary flood level
Source of information
Whether the information has been confirmed by local
inquiry.
HFL recommended for the purpose of design.
Certificate
Certificate that the highest flood level has been verified by
me, by local enquiry and from the record available and it is
RL..................................(GTS). This is a correct highest flood
level.

Signature
(Competent Authority
Approving the site)
IX.
Water Level in the first fortnight of November
Water level in the first fortnight of June
Lowest water level recorded
Lowest water level recommended
7. State if the flood is affected by the back water, if so gives the
following records
1. Distances of the confluence of the river from the bridge site.

2. Highest flood level of river.

3. Length of hack water spread.
9. Observed velocities if observed by any authority near existing
bridge:
Sr.

Flood Levels

Date

RL

Observe

Method of

Observe

Remark

No

of

observati

d by

wate

velocity

on

r
level
1
2

Highest floods
Moderate

floods
Other low
water levels

D. SUBSOIL INVESTIGATION
1.1)
Trial pits and bore results:
The record of trial pits or subsoil exploration shall be carried out as
per Appendix -2 of IRC 78 2000 and record shall be presented as per
Performa N. 1 & 2 attached with appendix.
2.1)

Drawing number indicating bore results.

Nature of Soil
Location

Founding level

Nature of soil

Safe bearing
capacity

Pier
Abutment
Basis: Actual plate bearing test or field laboratory test of strata met with at
founding level (discretion of Competent Authority approving site)
Certified that the safe bearing capacities of soil are as indicated in the above
table.

Signature
Following additional data is required for carving out hydraulic calculations
1. Nature of Stream:

Nature of the stream is required for assessing the value of coefficient of

rugosity values given to the following table may be adopted.
Rugosity Coefficient

Sr.

Surface

No

Perfe

Goo

ct

Fair

Bad

.
1

Clean, straight bank full stage, no rifts

0.025

0.02

0.03

0.03

for deep pools

Same as (1) but some weeds and

0.030

7
0.33

0
0.03

3
0.04

stones
Winding some pools and shoals clean

0.035

0.04

5
0.04

0
0.05

Same as (3) lower stages, more

0.040

0
0.04

5
0.05

0
0.05

ineffective sloe & section

Same as (3) same weeds and stones

0.033

5
0.03

0
0.04

5
0.04

Same as (4) story section

0.045

5
0.05

0
0.05

3
0.06

Sluggish river reaches, rather weedy or

0.050

0
0.06

5
0.07

0
0.08

with very deep pools

Very weedy reaches

0.075

0
0.1

0
0.12

0
0.15

Nature of stream:
Recommended value of u
2. Name of the bed material:
This is required for finding our Laccys silt factor (f), Extracts of the table in
class 110.1.3 of IRC 5-1998 (Section-1) are given here.
Type of bed material

Mean dia of particle

Value of (f)

in mm
Coarse silt
0.040
Silt/Fine sand
0.081 to 0.158
Medium sand
0.233 to 0.505
Coarse sand
0.725
Fine bajri and sand
0.988
Heavy sand
1.290 to 2.000
Note: Mean diameter of particle shall be determined

0.350
0.500 to 0.700
0.850 to 1.250
1.500
1.750
2.000 to 2.420
as per Appendix 2

of IRC 5 1998.
From this table, following values pertaining to the river stream is given:
Type of bed material
Mean diameter of particle in mm

Value of (I)

3. Nature of catchment area:

The value of coefficient (C) in Deckens formula depends upon the nature
of the catchment area. The following values may be adopted for difference
type of catchment areas in MP.
1. Annual rainfall 60-120cm
2. Annual rainfall >120cm

Value of C
11-14
14-19

Nature of catchment area (Annual Rainfall)

Recommended value of C
4. Design discharge
This may be calculated from the following empirical formula:
4.1
by Dickens formula
Q = CM2
Where Q = discharge in cumecs
C = Consent
M = Catchment area in Sq.Km
4.2
By mannings formula (Area velocity method)
Q = AxV
Where Q is discharge in Cumecs
V=1/NxR2/3xS1/3
A= Area of stream in Sq.m under HFL
V= Velocity in M/Sec
n= Rugocity Coefficient
R= Hydraulic mean depth in M
R= A/P in M
P= Wetted perimeter of river in M
S= Longitudinal Bed Glop
4.3
By rational formula for peak run off from catchment (CA up to 15
Sq. Km.)
As per article 4.7 of IRC SP 13-2004
0.056AJfP
Q=
Jc+1
Where Q is discharge in Cumecs
A = Catchment area in hectares
F = Coefficient as per fig. 4.2 of IRC SP 13-2004
P = Coefficient as per table given below
F= Coefficient as per Fig. 4.2 of IRC SP 13-2004
P= Coefficient as per table given below
fe=[0.87 x L3/H]0.385
fc= Concentration time in hrs
L= Distance from the critical points to structure in Kmrs.
H = Fall in level from the critical point to structure to meter.
Table

Catchment are characteristics

Steep bare rock and also city pavements
Rock steep but wooded
Plateaus, lightly covered
Clayey soil, stiff and bare
.................do.................lightly covered
Loam highly cultivated or covered
...................do.................largely cultivated
Sandy soil, light growth
...................do.................covered heavy brush

4.4

4.5

Summary of Discharges
1. By catchment area method
2. By are velocity method

P
0.9
0.80
0.7
0.6
0.5
0.4
0.3
0.2
0.1

Cumecs
:

Cumecs
(Average discharge at different cross sections)
3. By rational formula
:
Cumecs
Design Discharge
Note: the highest of these three values should be adopted as design
discharge provide it does not exceed the next highest discharge by

more than 50%. If it does not, restrict it to that limit.

Design discharge
V=
__________________________________________________
Area of cross section at bridge site below design HFL
5. Design flood level
:
RL
(As indicated in Para C7.8)
6. Scour depth
a) Observed scour depth
If the proposed bridge site is near an existing railway or road bridge,
the scour depth at the pier of existing bridge may be observed and
recorded.