1. RIVER DIVERSION ARRANGEMENT
• River Diversion arrangement consists of upstream and downstream cofferdams along with diversion
tunnel on right bank of Gola River.
• Salient features of diversion works:
Diversion discharge of 500 cumecs corresponding to 1 in 25 years non-monsoon flood. (refer BIS
14815 – 2000).
15 m high upstream cofferdam & 7 m high downstream cofferdam.
6.5 m diameter horse shoe shaped tunnel, 565 m long concrete lined
JAMRANI DAM MULTIPURPOSE PROJECT
5. ROLLER COMPACTED CONCRETE DAM
• Salient features of RCC Dam:
150.6 m high dam from the deepest foundation level.
9 km long reservoir with FRL and MDDL at El.762 m and 717.47 m respectively.
Live Storage is 142.72 MCM.
Maximum Water Level is El.763.60 m.
Crest Length of dam is 480 m with top width as 10 m.
Maximum base width of dam at deepest level is 186.10 m.
Dam is designed for Probable Maximum Flood of 8472 cumecs as per IS: 11223 – 1985 criteria.
JAMRANI DAM MULTIPURPOSE PROJECT
8. JAMRANI DAM MULTIPURPOSE PROJECT
• Salient features of Spillway:
Design Flood of 8472 cumecs as per IS: 11223 – 1985 criteria.
Ogee Shape profile for Main & Under sluice Spillway as per IS:6934 – 1998.
The main spillways and the under sluices shall be model tested to ensure the efficacy of discharge carrying
capacity.
Description Main Spillway Under Sluices
Gates Radial Type Radial Type
Gate sill elevation, m 715.82 700.90
Crest level, m 716 701
Number of openings 4 2
Width of each opening, m 8 5
Height of each opening, m 12 7.5
Discharge passed, cumecs 6536 2036
Location Block 12 to 15 Block 16 to 17
11. ROLLER COMPACTED CONCRETE DAM – ENERGY DISSIPATION
• Salient features of Energy Dissipation Arrangement:
Trajectory Bucket provided as per IS: 7365- 1985.
Invert Level of Bucket – El.666 m
End sill elevation of lip – El. 672 m
Trajectory Length from bucket lip – 218 m
Vertical distance of throw from lip level – 19.2 m
Provided Lip Angle of 30 degrees.
Trajectory bucket designed for flood of 8427 cumecs (PMF).
JAMRANI DAM MULTIPURPOSE PROJECT
12. ROLLER COMPACTED CONCRETE DAM – FREE BOARD
• Free Board Requirements:
Free Board estimated as per IS: 6512 – 1984 & IS: 875 (Part III) – 1987.
Free Board of 2 m above MWL has been provided.
Important Parameters for calculation of free board:
Full Reservoir Level= El.762 m
Maximum water level = El.763.60 m
Maximum fetch length over the reservoir area corresponding to FRL 762 m= 7411.30 m
Wind velocity over water = 140.4 km/h (39 m/sec)
Average depth of the reservoir = 92.73 m
JAMRANI DAM MULTIPURPOSE PROJECT
13. ROLLER COMPACTED CONCRETE DAM – STABILITY ANALYSIS
• Stability Analysis Reference Codes & Reports:
IS 6512 – 1984: Criteria for the Design of Solid Gravity Dams
IS 1893 – 1984: Criteria for Earthquake Resistant Design of Structures
IS 1893 (Part I) – 2002: Criteria for Earthquake Resistant Design of Structures and Buildings
Site Specific Earthquake design parameters as recommended by IIT Roorkee and Approved by
NCSDP
• US Army Corps of Engineers, EP 1110-2-12 and EM-2200
JAMRANI DAM MULTIPURPOSE PROJECT
14. ROLLER COMPACTED CONCRETE DAM – STABILITY ANALYSIS
• Design Loads:
Dead Load
Reservoir and Tail Water Loads
Uplift Pressure
Earthquake Forces
Earth and Silt Pressures
Ice Pressure
Wind Pressure
Wave pressure
• Thermal Loads
JAMRANI DAM MULTIPURPOSE PROJECT
15. ROLLER COMPACTED CONCRETE DAM – STABILITY ANALYSIS
• Load Combinations
A. Static Conditions:
• The static part of the structural analysis considers the following load conditions:
1. Load Condition A: Construction Condition
2. Load Condition B: Normal Operating Condition
3. Load Condition C: Flood discharge Condition
4. Load Condition F: Combination C with extreme uplift (drains inoperative)
A. Earthquake Conditions:
• The structural analysis considers the following loading conditions:
1. Load Condition D: Load Combination A with Earthquake
2. Load Condition E: Load Combination B with Earthquake
3. Load Combination G: Load Combination E with Extreme Uplift (Drains Inoperative)
JAMRANI DAM MULTIPURPOSE PROJECT
16. ROLLER COMPACTED CONCRETE DAM – STABILITY ANALYSIS
• Input Data Dam top 765.6 m
FRL 762 m
MWL 763.6 m
Tail water level (corr. To flood of 8427 cumecs) 646.98 m
Tail water level (corr. To dry weather flow) 632 m
Foundation level upstream 626 m
Foundation level downstream 626
Total height from deepest foundation level 139.6 m
Head acting corresponding to FRL 136 m
Top width of dam 10 m
Crest Level of Main Spillway 716 m
Base width of dam 129.9 m
Upstream slope 0.3 m/m
Downstream Slope 0.75 m/m
General River bed level 635 m
Design horizontal seismic coefficient 0.16
Design vertical seismic coefficient (2/3*horizontal) 0.1067
Distance of drainage gallery from heel side 9 m
Unit weight of concrete 2.4 t/cum
Unit weight of water 1 t/cum
Vertical density of silt 0.925 t/cum
Horizontal density of silt 0.36 t/cum
Length of block 17 m
Angle of internal friction 45 degrees
Cohesion between rock and concrete 12 t/sq.m.
Cube Compressive strength of concrete 2500 t/sq.m.
Allowable compressive strength in concrete 700 t/sq.m.
17. ROLLER COMPACTED CONCRETE DAM – STABILITY ANALYSIS
• Results
Maximum Overflow Section:
Load combination
Stresses developed
on toe portion
Stresses developed
on heel portion
F.S. sliding
Permissible
tensile stress
Permissible
compressive
stress
A 164.62 195.33 Infinity - 700
B 202.50 105.45 1.56 - 700
C 202.50 97.63 3.57 25 700
D 264.51 89.58 10.09 - 700
E 320.02 -1.60 1.60 50 700
F 198.51 31.49 1.76 50 700
G 315.50 -76.35 1.45 100 700
Load
combination
Stresses
developed on
toe portion
Stresses
developed on
heel portion
F.S. sliding
Permissible
tensile stress
Permissible
compressive
stress
A 80.18 231.45 Infinity - 700
B 209.22 81.68 1.76 - 700
C 209.22 81.68 3.57 25 700
D 105.46 200.28 8.99 - 700
E 282.23 24.37 1.23 50 700
F 204.46 17.73 1.56 50 700
G 276.85 -47.91 1.15 100 700
Maximum Non – Overflow Section:
