P A K I S T A N
WATER AND POWER DEVELOPMENT AUTHORITY
TARBELA DAM PROJECT
FLOOD MANAGEMENT MANUAL
2011
SURVEY & HYDROLOGY
TARBELA DAM PROJECT
ii
TARBELA DAM PROJECT
C O N T E N T S
Section T i t l e Page No.
1. Purpose of Flood Management Manual 1
2. Tarbela Reservoir 1
3. Data Collection Procedure 2
3.1 Existing Procedure 2
3.2 Proposed handling of Bunji data 2
4. Hydrology of Floods 3
5. Flood Limits 3
6. Reservoir Operations and Flood Routing 4
7. Routing of very high floods 4
8. Flood Management Committee 5
8.1 Implementation of Responsibilities 6
8.2 Procedure for Survey & Hydrology Section 7
8.3 Procedure for D&S Residency 8
8.4 Procedure for Geotechnical Section 9
8.5 Procedure for Mechanical Residency 9
8.6 Procedure for Project Security 9
8.7 Procedure for Wireless Station 9
8.8 Procedure for Senior Officer (Transport) 9
8.9 Procedure for Superintending Engineer (Services) 9
8.10 Procedure for Medical Superintendent (TDP) 10
8.11 Procedure for DCOs (Swabi, Haripur, Attock & Nowshera Districts). 10
9. Check List 10
10 Recommendations 10-11
TABLES
ANNEXURES
iii
LIST OF TABLES
TABLE TITLE
1 - Yearly Flood Peaks in Indus at Tarbela
2- Flood Frequency based on 143 Years (1868 – 2010)
3 - Telephone Directory
4 - Routing of flood peaks
LIST OF ANNEXURES
ANNEXURE TITLE
I Flood Drill Classification
II Inundation Map of Indus River with demarcation of 1929, 1992 & 2010 Flood Limit
Line.
III List of Villages likely to be inundated
IV Check List for Hydrology Section
V Tunnels & Spillways operating instructions
VI List of equipment & material available during emergency
1
TARBELA DAM PROJECT
FLOOD MANAGEMENT MANUAL - TARBELA RESERVOIR
1. PURPOSE OF FLOOD MANAGEMENT MANUAL
he 1992 flood peak of river Jhelum exceeded all floods of the recorded history and caused wide
spread damages in the country. Whereas Indus River on this occasion did not reach its pre-Tarbela
historic high value of 8, 20,000 cusecs while the peak inflow of 5,20,000 cusecs at Tarbela Dam
was the highest of its operation history. Similarly the flood peak, 2010 of River Indus, 835000
Cusecs, exceeded all floods of the recorded history and caused severe damages in the country.
This event has demanded review of existing reservoir operation procedures to mitigate hazard potential in the future.
The existing procedure of reservoir operation is based purely on dam safety requirements against various
hydrological considerations and does not include any specific provision to suppress the incoming flood for easement
of downstream flooding. Some relief is available automatically when the reservoir is rising from minimum to full
pool level and the flood peak is damped but there is no provision for making any deliberate efforts to do so.
From August 20 onward, any flood that comes has to be passed downstream. In the event of outflow exceeding
600,000 cusecs, it is apprehended that the villages situated on right and left banks of the Indus River for about 40
Km downstream Tarbela would be inundated. Appropriate action to be taken by district administration to lessen or
prevent the anticipated damages.
This manual describes the existing procedures and proposes modification to handle and route the very high floods (Q
> 600,000 cusecs) and the improvement of coordination links between various agencies and the offices at Tarbela.
2. TARBELA RESERVOIR
Tarbela Dam Project has been designed to augment and regulate the supply of Indus River water to irrigate
land in Indus Basin System and to generate electric power. Tarbela is a small reservoir with respect to the size of
Indus river considering that its present active storage of 6.625 MAF is only about 10.35 percent of the average
annual inflow at Tarbela which is 64 MAF (79 BCM).
Location of Tarbela Reservoir is such that about 90% of annual river inflow is derived from snowmelt. The
remainder of runoff is derived from rainfall in the Catchment area of 4,000 sq. miles lying immediately upstream of
dam site. Rain in this area is the most critical flood-producing factor of the basin. The minimum and maximum water
levels in reservoir for the year 2011 have been established as 1378 ft. and 1550 ft. respectively.
3. DATA COLLECTION PROCEDURE
3.1 EXISTING PROCEDURE
Hydrology Section receives hourly information on temperature, rainfall and gauge heights from Skardu,
Bunji, Besham, Phulra and Daggar Stations.
Additional rainfall information is received from Oghi and Shinkiari Stations. The communication is through
wireless system. Water Resources Management Directorate (WRMD) and Surface Water Hydrology (SWH) of
WAPDA at Lahore share this information through wireless system. The Reservoir Level is recorded round the clock
at hourly intervals and this information is passed on to Tarbela Dam Project (TDP) Hydrology office through
wireless or V-phone.
T
2
The average daily inflow at Tarbela is calculated using the daily outflow and change in storage during the day. The
inflow thus calculated is verified against inflow estimated from hydro meteorological information received from
upstream stations. The inflow at Tarbela, however, can also be estimated by adding to Besham (lagged by 7 hours),
two times the Phulra & Daggar flow (lagged by 6 hours). The gauge heights at these stations are converted into
discharges using rating tables.
Bunji gauging station carries special importance. Its lag time to Tarbela is 48 hours. Flow at Bunji is essentially
snowmelt with insignificant contribution of rainfall. Substantially higher or lower than normal flow at this station
should be taken as a flood warning.
3.2 PROPOSED HANDLING OF BUNJI DATA
A flow of 300,000 cusecs or more at Bunji warrants that depletion of Reservoir should be considered. It is
proposed that calculated depletion can be started immediately with an outflow not exceeding 500,000 cusecs.
Similarly if Bunji flows are consistently lower than 50,000 cusecs during June - September period, its cause must be
investigated. It is possible that abnormally low flow is due to formation of natural dam (landslide or glacier) in the
upstream river or its tributaries. Formation of a natural dam can significantly reduce the flow at Bunji and Tarbela is
thus pre warranted of impending dam burst flood.
On confirmation of such a situation Tarbela reservoir should be depleted to some predetermined elevation. The flow
at Bunji predicts the snowmelt component of anticipated flood. If Bunji flow remains below 300,000 cusecs the
anticipated flood would not exceed 1,400,000 cusecs at that time. To take advantage of flood warning system
especially during June-October period the flood warning data should be carefully examined to estimate inflow flood.
Depletion of reservoir may also be considered against heavy rainstorm flood if rainfall of 4" or more occurs in 6
hours and continues at any station near Tarbela.
4. HYDROLOGY OF FLOODS
The floods may result from the following factors: -
4.1 Increase in snowmelt runoff due to rise in temperature over the Northern Region.
4.2 Runoff by storm rainfall.
4.3 Release (rarely) of water as a result of the bursting of a natural dam.
4.4 Combination of above factors.
According to the Project Design Report by TAMS, the Probable Maximum Flood (PMF) of 1,773,000 cusecs will
have a base flow of snowmelt of 600,000 cusecs and rest will be generated by rainfall runoff.
Maximum reservoir level during this flood will be 1552.2 ft. The dam burst flood, simultaneously occurring with
PMF may reach 2,127,000 cusecs and resulting reservoir level will be 1556.5 ft. Although theoretically, dam must be
safe if the reservoir level remains at elevation 1556.5 ft for a few days but in view of uncertain health condition of
the embankments and foundations, the reservoir should be operated in a manner that level may not exceed 1550 ft.
The annual peak inflows are given in Table-I and Flood Frequency based on 143 years is given in Table -2
3
5. FLOOD LIMITS
Flood Limits below Tarbela are as follows: -
Flood Stage Discharge (cfsx1000)
Low 250
Medium 375
High 500
Very High 650
Super High 800
SE (S&H) will issue Flood Warning on the receipt of inflow data from upstream gauging stations to Government,
Civil and Project Authorities as laid down in the Flood Management Procedure "Annexure-I" Flood warnings should
be issued through "Express Telegrams".
The specimen of warning used by Survey & Hydrology Tarbela Dam Project is as under: -
“It is notified for the information of all concerned that with immediate effect the discharge downstream
Tarbela in River Indus will fluctuate between _______ to _______ cfs till further notice.”
A Fax machine bearing No: (0995) 660003 has been installed for the easy transmission / receipt of the messages.
Local administrations of adjoining districts were also requested to provide a separate wireless channel for
intimating the emergencies (In case of breakdown of Telephone system) but it was regretted because of secrecy of
provinces. Anyhow the primary responsibility of collecting warning rests with the civil and irrigation authorities.
6. RESERVOIR OPERATIONS AND FLOOD ROUTING
6.1 The basic principles for operating the reservoir are, to ensure the safety of the embankment dams
against overtopping and to fill the reservoir during high flows season. After attaining elevation of
1510 ft, the reservoir should be further filled at the rate of 1 ft / day so far possible, fulfilling the
irrigation requirements during the season.
6.2 It would be possible to operate the reservoir in a fashion to ameliorate sharp flood peaks
within the above mentioned limits, with vigilant watch on instrumentation network. The reservoir
can be lowered in advance of the flood peak on the basis of upstream flood warning information,
under the guidelines given in section 3.2 of the manual and flood peak ameliorated by the storage
created by the lowering.
6.3 Frequent changes in spillway discharge should not be preferred and during high spillway
discharges, the downstream river stages should not be increased rapidly.
7. ROUTING OF VERY HIGH FLOODS
Downstream valley of Tarbela can take about 500,000 cusecs safely without causing any significant
damage. Flows exceeding 600,000 cusecs will inundate side valleys & villages (Annex-II & III) and bring about
damages to life and property. Whereas inundation is unavoidable in the super high floods (say Q> 1,000,000 cusecs.)
some hazard mitigation is possible for the intermediate range of floods by allowing a temporary rise of Max: pool
level above EL.1550 ft. Temporary holding back of Indus flood peak in the reservoir and controlled releases to
prevent synchronization with the peak of other tributaries at various downstream confluences has therefore been
4
considered. It is proposed that at El: 1550 ft reservoir should be operated in such manner that maximum water levels
do not exceed the followings: -
7.1 If flood peak is less than 10,00,000 cusecs permissible Maximum level may be 1551.50 ft.
7.2 If flood peak ranges from 10,00,000 to 14,00,000 cusecs, the permissible maximum level may be
as 1552 ft.
7.3 If flood peak ranges from 14,00,000 to 17, 73,000 cusecs, the permissible maximum level may be
as 1553.5 ft.
7.4 The Dam burst flood simultaneously occurring with PMF will have a peak flow of 21, 27,000
cusecs and the resulting reservoir level may be 1556.5 ft. The above levels would provide some
flood mitigation in downstream valley of Tarbela. It is advisable that flood routing of selected
peaks be carried out using the latest Reservoir Level Capacity Tables and results kept handy for
reference in the flood management. Routing of flood peaks of 1992, 1997, 2007, 2008, 2009 &
2010 is given in Table-4.
8. FLOOD MANAGEMENT COMMITTEE.
The Tarbela Flood Management Committee (FMC) shall consist of the following: -
Chairman.
General Manager & Project Director, Tarbela Dam Project.
Coordinator
Director PMO.
Members:
1. Chief Engineer (Civil)
2. Chief Engineer Tarbela Power Station.
3. S.E (Survey & Hydrology) TDP.
4. R.E (External Works) Barrage TPS.
5. S.E (D&S) TDP.
6. Field Security Officer TDP.
A telephone directory for key personnel by designation is given in Table-3.
RESPONSIBILITIES OF FLOOD MANAGEMENT COMMITTEE
(a) To rout the flood under all conditions to ensure timely decision and action in all matters having bearing on
the safety of the dam should need arises, Flood Management Committee may consult Member (Water)/ GM
(P&D). However, if decisions of the Chairman of the Flood Management Committee (FMC) are different
from the instructions of the head office to meet the safety requirements of the dam, their action deemed fit
will prevail over the instructions issued by the head office (Lahore), as reservoir operating authorities are
the better judge to take such timely decisions.
(b) To inform downstream local civil administration authorities as soon as possible in the event that there will
be substantial increase in outflow.
(c) To keep a constant contact with Flood Forecasting Division Lahore.
5
(d) To keep Member (Water) informed on the situation of floods.
(e) To update the inundation maps after every flood season.
8.1 IMPLEMENTATION OF RESPONSIBILITIES
(a) Wapda Authorities
It shall be the task of SE (S&H) to examine the inflow data of Bunji & Besham. When inflow at Bunji
exceeds 300,000 cusecs or rainfall of 4" or more occurs for 6 hours period and continues at any station near Tarbela,
a super high flood may be expected. The data shall be transmitted as soon as possible (on phone) to the S.E (S&H)
and Coordinator of Flood Management committee. They will decide in consultation with GM&PD (Tarbela) whether
to increase the outflow beyond 520,000 cusecs or otherwise. In case it is decided by the committee to exceed the
outflow downstream Tarbela by more than 520,000 Cusecs then Flood Management Committee is responsible for
undertaking the following Procedure: -
The Flood Management Committee will assemble in Flood Control Room established in Hydrology Section. The
following organizations are directly responsible for execution of flood control procedures: -
1. Survey & Hydrology TDP.
2. Dams and Structures TDP.
3. RE (External Works (Barrage) TPS
4 Project Monitoring Organization (PMO) TDP.
Members of Flood Management Committee and key Wapda personnel including the telecommunication and
telemetry staff should carry an evaluation of the status of preparedness at least once a year. A meeting for the
purpose should be held (just before the flood season) with the Deputy Coordination Officers of districts Haripur,
Nowshera, Attock and Swabi to review the preparedness.
(b) Civil Authorities
The D.C.O of the concerned districts shall keep the inundation map (ANNEX II) ready in their offices or in
the offices they earmark for this purpose. They should ensure that no encroachments of habitation take place within
the areas bounded by 1929 Flood Lines. All areas lying within the 1929 Flood Marks must remain available for the
passing of future floods. Wapda cannot take responsibility for any action claims/compensations arising from river
flow in these areas.
The Inundation Map is useful for planning relief measures. The D.C.O’s shall plan their own evacuation procedure
(ANNEX III) and shall make the evacuation to the nearest high areas using the shortest possible routes. They would
also notify other agencies coming under floodwaters and help them in evacuation. They shall determine the gravity
of the situation and shall prepare the evacuation plan accordingly. They shall use all the available resources within
the district for this purpose and shall also demand help from the Army or other agencies if needed. On receipt of
flood warnings from the office of GM&PD, Tarbela or from the Flood Commission, the concerned D.C.O’s shall
warn the government functionaries at the lower level who shall start warning the population by beat of drums, loud
speakers and megaphones according to requirements.
If needed they shall also start evacuation of human beings, cattle and other moveable through trucks, buses, tractors,
bullock carts, boats and any other transport available in the area. The list of material & equipment available during
emergencies is given in Annex-VI. The camps established for this purpose will require being equipped with adequate
quantity of food and fodder and shall have the facilities of medical aid and drinking water.
6
8.2 PROCEDURE FOR SURVEY & HYDROLOGY SECTION
The Senior Engineer (Hydrology) shall immediately go to site when he receives information about
progressive rapid rise of Reservoir level. After site confirmation he will return to office, check Bunji and Besham
inflow data and report his finding to SE (S&H) (refer Annex-IV), who will then report to Chairman of Flood
Management Committee. The Senior Engineer will arrange to monitor gauges installed at the Various Locations.
i. The Gauge Observer in the office will compute the inflow data received from upstream gauging
stations and inform SE / Senior Engineer (S&H) who will convey it to Flood Management
Committee to seek their advice for downstream releases.
ii. During low flood, hydrological / meteorological data of upstream gauging station including
Tarbela is transmitted to Director WRMD Lahore and other agencies on six hourly basis. In flood
season, the data on hourly basis is communicated by Hydrology Section through wireless to
Director WRMD and Director PMD Lahore for onward transmission to Federal Flood
Commission and other concerned agencies.
iii. The Superintending Engineer (Survey & Hydrology) will issue flood warnings to all agencies
according to the intensity of flood as per Annex-I. The SE (S&H) will ensure (before the flood
season) that efficient Mass Communication Systems have been established by the civil authorities
in Haripur, Attock and Swabi districts.
iv. The Senior Engr: (Hydrology) will issue operation instructions to the control rooms of various
outlets at Tarbela for operation as advised by Flood Management Committee. The Senior Engr:
(Hydrology) must keep ready the flood routing of various combinations of inflow and outflow
conditions and the updated information on capability of rapid lowering of reservoir during the
crisis. For operating instruction for tunnels & spillways see Annex-V.
v. Keep barge - dumping material ready for operation.
vi. Keep boats ready for any emergency use.
8.3 PROCEDURE FOR D&S RESIDENCY TDP.
i. SE (D&S) will make a rapid but complete visit to the Project features and return to Flood Control
Room to report his preliminary findings to Flood Management Committee.
ii. SE (D&S) will inspect all embankment dams and concrete structures and natural slopes.
iii. Check every instrument section on MED and Auxiliary Dam –1
iv. Ensure the availability of stockpile of material for dumping in emergencies.
v. SE (D&S) or his representative will inspect all outlet structures.
vi. Observe wave heights.
vii. Monitor vigilantly the Dal Darra weir and channel condition and submit his report to Director
Project Monitoring regarding the safe discharge that can be passed over Dal Darra Weir.
7
8.4 PROCEDURE FOR GEOTECHNICAL SECTION
The staff of Geotechnical section (PMO) will monitor the performance of Embankment Dams and
Abutments and submit a report to Director (Project Monitoring) for review.
8.5 PROCEDURE FOR MECHANICAL RESIDENCY
i. Check Relief valves and their availability for operation in case of grave emergency.
ii. Check deck, machinery gates and gates structure.
v. Check outlet gates of tunnels to ensure their proper function if advised by Flood Management
Committee (FMC).
iv. Check turbines (1-14) and their proper function on 100% Wicket gate opening so that these may
not be tripped when required in emergency.
vi. Ensure that Siren installed at control rooms of various outlets are in working condition and direct
the staff to blow the Siren as and when advised by FMC.
8.6 PROCEDURE FOR PROJECT SECURITY
Site security staff will immediately report any observed abnormality to Director (PMO) and SE (D&S).
8.7 PROCEDURE FOR WIRELESS STATION
i. Keep uninterrupted contact with upstream gauging stations and communicate the Inflow data.
Ii Transmit Tarbela inflow, outflow data to Director WRMD Wapda House Lahore and Director Pakistan
Meteorological Department Lahore for onward transmission to Federal Flood Commission and other
agencies.
8.8 PROCEDURE FOR SENIOR OFFICER (TRANSPORT)
Keep ready transport of Project for any possible emergency operation including reliable transport for repair
of gauging stations as advised by FMC.
8.9 PROCEDURE FOR SE (SERVICES)
i. To provide megaphones and amplifiers in working condition for any possible operation as and when
advised by FMC.
ii. To keep tents etc. ready.
iii. To ensure that T&T and Local Telephones of Flood Control Room are in working condition.
8.10 PROCEDURE FOR MEDICAL SUPERINTENDENT TDP.
To keep ambulance and staff ready for meeting emergency and shall maintain contact with Flood Control
Room.
8
8.11 PROCEDURE FOR D.C.O (SWABI, HARIPUR, ATTOCK & NOWSHERA)
i. Civil authorities shall identify the flooded areas and arrange relief measures.
ii. Superintendent of Police of respective area will be expected to co-operate and assist FMC as and when
requested.
iii. The Army Unit may be requested to remain on alert for any possible emergency operation as and when
requested by the FMC.
9. CHECK LIST
A checklist of drill procedures shall be prepared and kept updated at all times to serve as quick reference. A
proposed checklist for Hydrology residency is given in Annexure - IV.
10. RECOMMENDATIONS
In order to overcome existing problems and to enhance the performance of overall system the following
provisions/improvements are proposed: -
A - TELECOMMUNICATION NETWORK
i. Alternate arrangement may be made at upstream gauging stations to ensure communication without
interruption.
ii. Existing vacancies of wireless operators should be filled up for the smooth running of work.
B - HYDROLOGY SECTION
i. Carrier Telephone connection from Tarbela Power House should be provided at Hydrology
Section for easy communication.
ii Existing vacancies of this residency should be filled up for the smooth running of work.
iii. At least two reliable vehicles should be provided to this residency to combat with any emergency.
iv. Internet connection should be provided to Survey & Hydrology Residency for flood information &
other related data required for flood.
v. Fax machine should be installed in Survey & Hydrology Residency.
C - FLOOD INUNDATION LIMIT LINE
It is worth mentioning here that, Motorway traverse across the Indus River d/s of historical village Hund.
The embankment of Motorway will hinder the flow, in case of release exceeding very high to exceptionally
high floods, from Tarbela. Resultantly the flows will affect more area on u/s of River crossing due to rising
of water level.
The inundation/limit line of 2010 flood has been marked on flood inundation map Annexure-II.
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TABLE-1
YEARLY FLOOD PEAKS (INSTANTANEOUS) IN INDUS AT TARBELA
DATE DISCHARGE (CFS)
02-07-1970 379,000
29-07-1971 367,000
09-07-1972 335,000
20-07-1973 442,000
20-07-1974 354,000
21-08-1975 426,000
18-07-1976 349,000
16-07-1977 436,000
30-06-1978 434,000
14-07-1979 336,000
07-08-1980 308,000
12-08-1981 330,000
13-08-1982 347,000
06-08-1983 380,000
16-08-1984 337,000
31-07-1985 345,000
01-08-1986 390,000
27-07-1987 329,000
23-07-1988 480,000
31-07-1989 510,000
26-06-1990 401,000
22-07-1991 340,000
10-09-1992 520,000
10-07-1993 370,000
24-07-1994 420,000
25-07-1995 495,000
14-08-1996 402,000
27-08-1997 400,000
13-07-1998 366,000
04-08-1999 382,000
10
02-08-2000 372,000
23-07-2001 294,000
13-08-2002 343,000
25-07-2003 338,000
21-06-2004 273,000
15-07-2005 401,000
05-08-2006 460,000
30-06-2007 348,000
16-06-2008 325,000
16-08-2009 326,000
30-07-2010 835,000
TABLE-2
FLOOD FREQUENCY BASED ON 143 YEARS (1868 - 2010)
Flood Range Cfs x
100,000 No. in 143 Years Frequency %
2 to 3 35 25
3 to 4 43 30
4 to 5 50 35
5 to 6 12 8
Above 6 3 2
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TABLE-3
TELEPHONE DIRECTORY
TDP Exchange 0995 - 660562-64 & 660571-72
TPS Exchange 0938 - 272230 - 32
WAPDA – TARBELA OFFICE RES:
GM & PD TDP 3102 3215 Fax: 0995 - 660003
CE (TPS) 3201 3137 Fax: 0938 - 272706
CE (Civil) 3105 3205
S E S&H 3164 3285
Dir PMO 3189 3245
RE (M) - TPS 2235 2316
RE (E) - TPS 2237 2144
RE (P) - TPS 2200 2161
RE Barrage 3155, 0995-662322 Cell #. 0301-5483626
1. SE-1 (GB) 662313 3206
2. Aux: Spillway 2283
3. Service: Spillway. 2336
4. Tunnel-4 2354 Through TDP
Exchange.
5. Tunnel -5 2315, 2415
6. Medical Supdt. 3211 3187
FSO 3158 3160
SO (T) 3275 3139
7. SE (D&S) 3144 3259
SE (Workshop) 0995-511474 3288
SE (Services) 3142 3193
Sr. Engineer (Hyd) 3178 3113
8. Sr. Engineer (Gates) 2270 Through TDP Exchange.
Sr. Engr (Geo Tech) 3225 3162
WAPDA - LAHORE
Member (W) 99202226
GM (P&D) 99202631
GM (C&M) 99202610
C.E. (H&WM) 99202598 FAX: 99204031
Director (WRMD) 99202483
CE (Dams) 99202986, 9202986
Director Pakistan Met: 99200139, 99201238 Fax: 99200209
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ISLAMABAD
IRSA 051-9252626, 9201282 & 9204538 FAX: 9201282
Chairman IRSA 051-2202975
C.E. NPCC Cell. #: 0300-8472550
CEA/Chairman, FFC 051-9206589 & 9224991
N.P.C.C. Control Room 051-92572772 & 9257324
FLOOD COMMUNICATION CELL
Chief Engineer (DSC) 051-9224061
Chief Engineer (Floods) 051-9201365
SE (Floods) 051-9202348
Senior Engineer (Floods) 051-9213455
Principal River Engineer 051-9219386
9.
MANGLA
Chief Engineer (0544) 639161 639045 FAX: 639162
CHASHMA
Exchange (0459) 241289, 241463 & 242858
P.D 41462-63 FAX: 241458
XEN 241282
RAWALPINDI
XEN (S.W.H) 4414623
GOVERNMENT AGENCIES
D.C.O. Swabi 0938-221300 & 221220 FAX: 221917
A.C.O Swabi 0938-221402
D.C.O. Attock 057-9316110 Fax: 9316012
S.P. Attock 057-9316206
EDO (R) Attock 057-9316077
D.C.O. Nowshera. 0932-9220098-99
D.C.O. Haripur 0995-613391 Fax: 615412
A.C.O Haripur 0995-610455 & 615413
10. XEN irr: Swabi 0938-221206
TMA Ghazi 0995-660414 & Cell. # 0300-5211839
DSP Ghazi 0995-660265
11. PS Ghazi 0995-660688
LEGENDS: -
EDO ® Executive District office (revenue)
TMA Tehsil Municipal administration
PS Police Station
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TABLE – 4
ROUTING OF FLOOD PEAKS
Date
Reservoir level Inflow Outflow
(Ft) (Cfs x 1000) (Cfs x 1000)
Mx Mn Mx Mn Mx Mn
1992
9-9-1992 1550.30 1549.94 490 163 475 147
10-9-1992 1550.50 1549.95 520 260 522 231
11-9-1992 1550.16 1550.02 258 185 236 180
12-9-1992 1550.07 1549.90 184 154 206 134
1997
27-8-1997 1550.79 1549.84 400 197 471 192
28-8-1997 1550.10 1549.86 325 206 277 124
2008
15-6-2008 1433.00 1424.23 293 282 187 109
16-6-2008 1442.10 1433.27 325 293 190 111
17-6-2008 1448.90 1442.43 297 274 191 113
18-6-2008 1455.88 1449.35 300 265 194 114
19-6-2008 1461.45 1456.06 294 272 196 114
20-6-2008 1467.42 1462.63 292 260 199 115
2009
15-8-2009 1545.71 1544.71 296 280 273 240
16-8-2009 1546.72 1545.72 326 279 307 241
17-8-2009 1547.77 1546.74 306 285 292 258
18-8-2009 1548.50 1547.80 291 257 266 215
19-8-2009 1549.64 1548.58 255 202 216 171
20-8-2009 1550.07 1549.71 200 193 196 171
21-8-2009 1550.07 1549.66 193 172 196 168
2010
27-07-2010 1510.33 1508.16 297 249 231.7 120.9
28-07-2010 1514.63 1510.60 566 292 422.5 115.7
29-07-2010 1520.87 1514.83 800 570 580.4 425.6
30-07-2010 1524.64 1521.20 835 480 604.0 477.8
31-07-2010 1524.61 1524.16 476 433 489.6 392.6
1-08-2010 1525.88 1524.71 432 378 381.5 354.9
2-08-2010 1526.97 1525.92 376 347 360.0 326.7
3-08-2010 1528.17 1527.00 358 342 329.7 316.9
4-08-2010 1529.22 1528.21 356 345 323.4 318.6
5-08-2010 1530.26 1529.25 390 341 365.8 323.5
14
6-08-2010 1531.97 1530.30 460 391 418.4 356.8
7-08-2010 1533.66 1532.02 500 455 436.6 418.6
8-08-2010 1535.57 1533.76 549 504 493.9 436.1
9-08-2010 1536.94 1535.65 568 541 538.7 489.6
10-08-2010 1538.02 1537.00 580 495 539.4 476.9
11-08-2010 1538.65 1538.06 497 480 481.5 451.5
12-08-2010 1540.24 1538.71 476 424 434.8 388.5
13-08-2010 1540.62 1540.22 424 406 430.0 355.0
14-08-2010 1542.16 1540.69 405 378 370.1 299.6
15-08-2010 1542.90 1542.17 402 374 371.6 355.1
16-08-2010 1544.00 1542.94 387 375 357.3 342.1
17-08-2010 1544.78 1544.03 380 354 357.7 322.7
18-08-2010 1546.17 1544.82 353 346 336.8 285.1
19-08-2010 1547.00 1546.18 347 341 336.8 311.0
20-08-2010 1547.87 1547.05 346 338 347.9 291.0
21-08-2010 1548.85 1547.94 338 320 308.8 283.7
22-08-2010 1549.74 1548.90 327 299 293.5 259.4
23-08-2010 1550.47 1549.77 297 281 311.4 210.6
15
ANNEXURE-I
TARBELA DAM PROJECT
12. FLOOD DRILL CLASSIFICATION
FLOOD WARNING INTENSITY OF ACTION
CLASSIFICATION DISCHARGE (CFS X 1000)
SE (S&H) WILL ISSUE LETTER/
NOTIFICATION TO THE
FOLLOWING:
1: -- LOW 250 A. LOCAL AUTHORITIES
i. GM & PD TDP
ii CE (CIVIL) TDP
iii CE (POWER) TPS
iv ALL S.ES OF TDP, F.S.O & P.R.O
v RE (EXTERNAL WORKS) GBHP BARRAGE
2: - MEDIUM 375 B. CIVIL AUTHORITIES
1. DISTRICT CO-ORDINATION OFFICER, HRIPUR
2. DISTRICT CO-ORDINATION OFFICER, SWABI
3. DISTRICT CO-ORDINATION OFFICER, NOWSHERA
4. DISTRICT CO-ORDINATION OFFICER, ATTOCK.
5. INCHARGE POLICE STATION ATTOCK
C. IRRIGATION DEPARTMENT
1. EXECUTIVE ENGINEER, KALABAGH
2. EXECUTIVE ENGINEER, CHASHMA
3. EXECUTIVE ENGINEER, TAUNSA
4. SE THAL AT MULTAN
5. SE MZG, AT MULTAN
6. SE DJT, AT D.G.KHAN
7. EXECUTIVE ENGINEER, D.G.KHAN
3. HIGH 500 AS B&C ABOVE
4. VERY HIGH 650 DO
5. EXCEPTIONALLY HIGH800 DO
NOTE: -
I. Tunnels are operated at full gate opening from Res.El.1300 ft. to 1505 ft.
II. Spillways are operated above Reservoir level 1505 ft. minimum releases through Auxiliary & Service
Spillways are 50,000 & 90,000 cfs respectively
III. Auxiliary Spillway is opened first; until releases exceed 206,000 cfs when both Spillways are opened in
unison.
IV. Both spillways are operated with equal gate opening when discharge of auxiliary spillway exceeds 250,000
cfs then gate no.2 & 8 are suppressed by1/3 of total gate opening.
V. Above elev. 1533 ft. both Spillways are operated with equal gate opening: to protect spillway from
earthquake, minimum opening of Auxiliary Spillway 5 ft at 1538, 6 ft. at 1540, 8 ft. at 1545, & 9.5 ft. at el.
1550 & Service Spillway is opened next until it is releasing minimum 90,000 cfs.
VI. Between dates October 1- March 31, warning should be issued immediately as river rises to low (250,000
cfs) flood stage.
16
VII. For the period April 1-September 30, warning should be issued only when a river reaches the medium
(375,000 cfs) flood stage; no warning is to be issued for low flood during the summer.
ANNEXURE-III
VILLAGES LIKELY TO BE INUNDATED
S.No. Village District
1. Hariana Swabi
2. Salah
3. Nabi
4. Raziabad
5. Allahdher
6. Mian Isa
7. Ali Muhammad
8. Misri Banda
9. Agricultural Farm
13. Pir Sabak Nowshera
14. Sur Kamar Dehri
15. Akora
16. Police Station Nowshera Cantt:
17. Over Head Bridge.
18. Pinwandi Baba
19. Santini Dehri
20. Kheshgi Payan
1. Chhata Baba Attock
2. Ashab Baba
3. Khan Maliar Baba
1. Bai Haripur
17
ANNEXURE-IV
CHECK LIST FOR HYDROLOGY SECTION
Sr. NO
A C T I V I T Y ACTION BY
1. The Senior Engineer will immediately go to site when he receives
information about progressive rapid rise of reservoir level. After site
confirmation and checking of upstream gauging station data and
Besham inflow, he will report his findings to S.E. Survey &
Hydrology.
Sr. Engr. (Hyd)
2. Observation of Reservoir gauge on hourly or ½ hour basis round the
clock as advised by Sr.Engr (Hyd).
Gauge observers
3. Computation of inflow of Skardu, Bunji, Besham, Siran & Brandu
through rating tables and rainfall gauges of Oghi and Shinkiari.
Gauge observers
4. Dhall Darra weir, piers and rock narrow protection work gauge
observation.
Gauge observers
5. Issuance of Flood Warning to all concerned agencies. S.E (S&H)
6. Issuance of instructions for the operation of various outlets and to
blow siren.
Sr. Engr. (Hyd).
Note: Site staff will communicate the data through walkie-talkie sets to Flood Control Room.
ANNEXURE-V
21. TUNNELS & SPILLWAYS OPERATING INSTRUCTIONS
1. Usually irrigation Tunnel Nos. 4 & 5 are operated upto reservoir elevation 1505 ft. These tunnels are
operated at full gate openings. Above elevation 1505 ft, the tunnels can only be operated in grave
emergencies.
2. Spillways are put into operation between the reservoir elevation 1505 ft & 1550 ft. There are no specific
instructions to operate spillways above elevation 1550 ft. The spillways operating instructions between
reservoir elevation 1505ft & 1550 ft and above are as under:
I. When the reservoir attains the elevation of 1505 ft, Aux: Spillway is put into operation. Its first operation
would be free flow because flipping action is not possible if the average discharge through Aux: spillway is
less than 50,000 cusecs and for Service Spillway if it is less than 90,000 cusecs.
II. Aux: Spillway is primary spillway to operate up to discharge of 206,000 cfs, if the discharge is over and
above 206,000 cfs then Service Spillway is put into operation having discharge more than 90,000 cfs in any
case.
III. If Aux. Spillway is required to discharge more than 250,000 cfs then Gate Nos. 2 & 8 are suppressed by
1/3 of total gates opening.
18
IV. The raising of gates of both the Spillways is started from end gates i.e. in case of Aux Spillway gate No: 1
& 9, 2 & 8, 3 & 7, 4 & 6 and 5 are raised. The gates of Service Spillway are operated during raising
operations in similar way.
V. The lowering of spillway gates is started from the center i.e. in case of Aux. Spillway gate No 5, 4 & 6, 3 &
7, 2 & 8 and 1 & 9 are lowered. The gates of service spillway are operated in same manner during lowering
operation.
VI. When the spillways are to be operated under free flow condition, all the gates are raised equally to avoid
turbulence immediately downstream of the gates.
VII. The spillway gates are not to be operated with fraction of a foot opening.
VIII. All the gates are operated with the equal gate settings except Aux. Spillway end gates 2 & 8 which have to
be suppressed by 1/3 of the opening of the remaining gates to avoid splashes over the chute walls.
Annexure -VI
LIST OF EQUIPMENT & MATERIAL AVAILABLE DURING EMERGENCIES
S# Name of Equipment/Material Quantity (Nos)
1. Survey Boat 1
2. Survey Barge 2
3. Speed Boats 2
4. Conveyor system 1
5. Dumper 12
6. Loader 3
7. Dozer 3
8. 110 Tons Crane 1
9. 60 Tons Crane 1
10. 18 tons Crane 2
11. 16 Tons Crane 1
12. 12 Tons Crane 2
13. 10 Tons Crane 1
14. Grader 4
15. Truck 6
16. Water tanker 4
17 Bus 17
18. Light vehicle 110
19. Wireless sets Walk Talkie 12
20. Fire Brigade 4
21. Diesel Generator. 6
22. Siren 10
23. Amplifier 4
24. Ambulance 3
19
ANNEXURES