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