Haigher Storage Dam
Data characteristic :
Contract title: Detailed Design of Haigher Dam and water conveyer route system for irrigation, Potable and Industrial Purposes.
Location of site, 45 km from Firuz-abad (35 km in main Road of Firuz-abad to Qir plus 10 km diversion road ).
a) site locata of Haigher Dam
This large dam is located at the entrance of Haigher Gorge, on Firuz-abad river at 45 km from Firuz-abad City at the end of Firuz –abad plain with coordinate 28°-39' Northing and 52°-41' Easting.
Main resources of this river are collecting the water from Hanifaqan springs with 23 exits having the average discharge of 2.5Cms to 5Cms. Several tributaries are Joining to this river when arrives to Tangab dam site. Annual average discharge of river at Tangab Dam is about
117 MCM/year. In Sub-basin, between Tangab Dam on Firuz–abad river reach to Haigher Dam has a catchments area of 917km2. After construction and operation of Tangab dam the annual river discharge at Haigher Dam site is about 164 MCM/y. This river has flood character but 3 main springs in Firuz-abad plain are joining to that river. The name and mean annual discharge of these springs are Qomp Ateshkadeh, Rudbal and Sarkhergheh+Alikhergeh having respectively discharge of 32MCM, 22MCM/y and 15 MCM/year. From that amount at least 28 percent of this water is using for irrigation and about 50 MCM/y inflowing to Firuz-abad river to reach to Haigher Reservoir Dam. Water quality of those springs and raining flood are very good with TDS ( total dissolve solid ) between 280 to 580 mgr/lit.
Friuz-abad river inflowing to Haigher Gorge with length of about 12 km. Elevation of river at the entrance of Gorge is about 1103 m and at the exit near Dehrud village, the Ground Elevation of Regulation Dehrud dam is about 840m.
About 2 km after Dehrud regulating dam the influence of salt Domes, ( Diapir plug ) disturb completely the quality of this suitable water to salty water. It means, when Firuz-abad river is crossing salty area and receiving the water of some saline springs the average TDS of water increases from 400 mgr/lit to 11,000-12,000 mgr/lit which is out of usable water. After crossing completely contaminating area the name of river changes to Shur river ( river of saline water ) and it collects some other tributaries to become Monde River with lower TDS ( about 2,800-4,000 mgr/lit) to reach to Persian Gulf.
However, the aim of construction of Haigher Dam is to collect, regulate and use this suitable water for the purpose of drinking, Industrial and irrigation for arable lands ( in some parts ) of Firuz-abad river Bank. After salty area, by means of 5.3km Tunnel and 18.5km pipeline to reach arable lands, then main pipeline goes to southern Industrial towns of petroleum and gas refinery like: Ala-Marvdast, Mohr, Lamerd and Jam cities. The conveyer route transfers about 84MCM/y in average to those cities. Also for maintaining the ecosystem of river at the end of salty area a conveyer pipe of 650 lit/sec capacity delivers sweet water to this river during at least 8 dry months of the area with annual average delivery of about 11 MCM/y. For arable lands about 35 MCM/y in average rate is specified. The limitation of irrigation water is firstly due to the value of drinking water in the arid and dry zone with high difficulty of providing driving water.
b) Location of Irrigation land with pressurized system :
The arable lands are located at Checkup, Ahmad-abad and Dehram area These lands are in a distance between 25 to 30km from Dehrud village and actually they are without water. By some exception of some land owners are suing water wells which are not with a suitable water quality and quantity
However, about 4500. ha. net arable lands are selected to receive suitable water from conveyer route from Haigher Dam to south Region. This conveyer route includes: Dehroud Regulating Dam + Conveyer tunnel of internal Dia. of 3m with entrance elevation at 845m, and its exit, at 840m at the end of runnel a regulating pool of 8000m3 is located with bottom elevation of 835m. The conveyer pipeline with 2f1600 mm is branching, for transfer of water with a capacity of 7Cms from this pool.
At km of 13.3 another Forebay pond at elevation about 815 m. is located. From this second pool the Irrigation pipelines and water releasing for ecosystem are branching, which results the outlet of pipeline with capacity of 3.6 Cms to convey directly the water for southern cities as mentioned above.
This potable pipeline has dia . f1800mm and continue in about 162km to reach " Jam city ". At km 133.1 the Branch of water to Ala-Marvdasht, is connected to Main pipeline the at km about km. 140 another branch for Lamerd and Mohr area is connected to main pipeline. From this point diameter of main pipeline is reduced to f1400 mm whit capacity of 2.2 Cms to deliver water to
History and objective of project
1) previous study of Haigher Dam project:
Feasibility study of Haigher Dam and water conveyer system was carried out by Ab-Niru Consultant Engineering Company under contract award of 407/2102 dated 21/Dec. /1991, given by Fars Regional water authority.
In the previous investigation, Feasibility study was achieved in 1994 for conveyer system of irrigation and potable water to Farrashband city. But during verification and approval of the project in 1997, the water conveyer system to Farrashband was changed to provide water for southern part of
2) Qualitative and quantities objective of project:
a) to store and regulate discharge of Firuz-abad river at Haigher dam site for average annual yield of 129.6 MCM/y.
b) to improve and develop irrigation of 4500 ha net area of Dehrram (3500 ha) and Ahmad-abad (1000 ha ) with average annual supply of 35 MCM/year.
c) to construct conveyer water route system including: :
Dehrud Regulating Dam + Tunnel route of 5.25 Km length with two access adits, conveyer pipe of 175 km length and Jam Pump station to deliver annual average 84.2 MCM to Ala-Mardaht, Lamerd, Mohr and Jam city.
d) to improve water quality of river by releasing the ecosystem demand of
Firuz-abad river after salt domes, during about 9 months of low discharge of river water.
e) to increase highly the income of agricultures of the region by sufficient water 5 supply and Mechanized Irrigation system.
f) to increase the number of employment by agriculture development and auxiliary industries to prevent immigration of villagers to cities .
g) to improve local climate and ecosystem of the Reservoir of 980 ha. Surface area and 227Million cubic metre for Reservoir capacity. By this large reservoir the development of warm water fisheries should be expected.
Companies involved in the study and investigation of this Project :
1) Ab-Niru consultant Engineering Company ( for phase I & II study)
2) Naghsh- tarsim Millad Co. for surveying and drawings of whole Regions .
3) Khak-Azma Consultant
4) Pay-Kav Consultant
6) Technical specification of Project :
a) Generals
- Catchments area to dam-site ( sub-basin ) : 918 Km2
- average height of basin : 1614 m
- highest point of mountains : 3100 m
- river bed elevation at dam site : 1103 m
- Average annual rainfall over Basin : 530 mm
- Average annual evaporation from lake surface : 2023 mm
- probable Max. Precipitation ( PMP) : 394 mm/day
- peak Flood discharge with 1000 yr return period : 2510 m 3/ sec - peak Flood discharge with 10,000 yr return period : 3670 m 3/ sec
- P.M.F. Peak discharge : 6377 m 3/ sec
- Sediment Cummulation for 50 years : 25 MCM
5-2) Dam Data :
a) Dam body
- Dam type RCC with total volume = 275,000 m 3
- dam height from river bed = 76 m
- dam height from foundation = 90 m
- Normal water level = 1175 m
- Max. water level = 1178 m
- Crest elevation = 1179 m
- Min water level ( intake level ) = 1130 m
- dead storage = 12 MCM
- Life storage = 215 MCM
- Reservoir Capacity at N.W.L (1175m ) = 227 MCM
- Alluvium max. thickness at dam site = 11 m
- Crest length = 200 m
- Crest width = 5 m
- lake area at NWL = 980 ha
- lake area at Max. W.L = 1130 ha
-
- D/S slope = 1.V: 0.7 H
- Dam volume ( RCC+CVC) = 275,000 m3
- Exaction of dam foundation & abutments = 157,000 m3
- Rock exaction of at dam site = 130,000 m3
b ) Diversion Tunnel and water intake
- Tunnel, Internal dia. = 6.5 m
- Length = 290 m
- All excavation = 60,000 m3
- Concrete vol. ( Reinforced ) = 14,000 m3
- reinforcement = 660 ton
- Diversion flood capacity = 560 m 3/ sec
- Water intake level = 1430 m
Pipe dia. f 1600 mm
c) spillway ( quated spillway ) : on Dam body
- reinforced concrete vol. = 6,000 m3
- ogee crest length = 3´10 m
- ogee crest elevation = 1165 m
- Spillway Capacity at Max. Level = 3390 m 3/ sec
( about PMF routed )
d ) grouting galleries
- Crest galleries length = 300 m
- Lower gallery & dia. = 910 m ( 3m dia )
- saft = 2´62 = 124 m
e) bottom outlet at N.W.L = 52.6 m 3/ sec
- intake capacity at N.W.L = 8.5 m 3/ sec
with pipe of f 1600 mm
f) water tightening system :
- Cut off wall for cofferdam = 1800 m 2
- drilling – grouting of curtain grouting = 60,000 mL
- Consolidation grouting = 18,000 mL
