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Report on Rule Levels for Major Reservoirs of KSEBL

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Report on Rule Levels for Major Reservoirs of KSEBL Report on Rule Levels for Major Reservoirs of KSEBL May, 2019 RULE CURVE FOR MAJOR RESERVOIRS OF KSEBL MAY 2019 CONTENTS 1. Introduction ................................................................................................................................................... 1 2. Data Collection ............................................................................................................................................... 2 3. Methodology .................................................................................................................................................. 2 3.1 Variables ................................................................................................................................................ 2 3.2 Procedure .............................................................................................................................................. 3 4. Rule Levels for Idukki reservoir ...................................................................................................................... 4 4.1 General .................................................................................................................................................. 4 4.2 Salient Levels ......................................................................................................................................... 4 4.3 Elevation - Storage - Area Details .......................................................................................................... 4 4.4 Scheduled release for power generation .............................................................................................. 5 4.5 Inflow to Idukki Reservoir in critical years ............................................................................................ 6 4.6 10-Daily inflow series ............................................................................................................................ 7 4.7 10-Daily inflow series with 50% and 90% percentage of dependability ............................................. 11 4.8 Deriving Rule Levels ............................................................................................................................ 12 4.9 Rule levels corresponding to 50% dependable inflow ........................................................................ 13 4.10 Upper Rule Levels ................................................................................................................................ 13 4.11 Lower rule Level .................................................................................................................................. 15 4.12 Rule Curve ........................................................................................................................................... 16 4.13 Lay out - Idukki Hydro Electric Project including Diversion Structures ............................................... 17 5. Rule levels of Idamalayar Reservoir ............................................................................................................. 18 5.1 General ................................................................................................................................................ 18 5.2 Salient Levels ....................................................................................................................................... 18 5.3 Elevation - Storage – Area Details ....................................................................................................... 18 5.4 Scheduled release for power generation ............................................................................................ 19 5.5 Inflow to Idamalayar Reservoir in critical years .................................................................................. 19 5.6 10-Daily inflow series .......................................................................................................................... 20 5.7 10-Daily inflow series with 50% and 90% percentage of dependability ............................................. 24 5.8 Deriving Rule Levels ............................................................................................................................ 25 5.9 Rule levels corresponding to 50% dependable inflow ........................................................................ 26 5.10 Upper Rule Levels ................................................................................................................................ 27 5.11 Lower rule Level .................................................................................................................................. 27 5.12 Rule Curve ........................................................................................................................................... 29 5.13 Layout Map – Idamalayar Hydro Electric Project ................................................................................ 30 6. Rule Levels for Kakki reservoir ..................................................................................................................... 31 6.1 General ................................................................................................................................................ 31 6.2 Salient Levels ....................................................................................................................................... 31 6.3 Elevation - Storage - Area Details ........................................................................................................ 31 6.4 Scheduled release for power generation ............................................................................................ 32 6.5 Inflow to Kakki reservoirs in critical years ........................................................................................... 32 6.6 10-Daily inflow series .......................................................................................................................... 33 6.7 10-Daily inflow series with 50% & 90% dependability ........................................................................ 35 6.8 Deriving Rule Levels ............................................................................................................................ 36 6.9 Rule levels corresponding to 50% dependable inflow ........................................................................ 37 6.10 Upper Rule Levels ................................................................................................................................ 37 6.11 Lower rule Level .................................................................................................................................. 38 Page ii RULE CURVE FOR MAJOR RESERVOIRS OF KSEBL MAY 2019 6.12 Rule Curve ........................................................................................................................................... 40 6.13 Lay out of Structures of Hydroelectric Projects in Pamba basin ......................................................... 41 7. Rule levels of Banasurasagar Reservoir........................................................................................................ 42 7.1 General ................................................................................................................................................ 42 7.2 Salient Levels ....................................................................................................................................... 42 7.3 Elevation - Storage Details .................................................................................................................. 42 7.4 Inflow to Banasurasagar Reservoir in critical years ............................................................................ 43 7.5 10- Daily Dependable inflow series ..................................................................................................... 43 7.6 Deriving Rule Levels ............................................................................................................................ 44 7.7 Rule levels corresponding to 50% dependable inflow ........................................................................ 44 7.8 Upper Rule Levels ................................................................................................................................ 45 7.9 Layout of Structures under Kuttiyadi Hydro Electric Project .............................................................. 46 8. Rule levels of Sholayar Reservoir ................................................................................................................. 47 9. Recommendations ....................................................................................................................................... 47 Annexures ANNEXURE A1 - Idukki Reservoir – Flood Hydrograph - 100 Yr return period ..................................................... 50 ANNEXURE A2 - Idukki Reservoir – Flood routing with flood - 100 Yr return period ........................................... 51 ANNEXURE B1 - Idamalayar Reservoir – Flood Hydrograph - 100 Yr return period ............................................ 54 ANNEXURE B2 - Idamalayar Reservoir – Flood routing with flood - 100 Yr return period ................................... 55 ANNEXURE C1 - Kakki Reservoir- Flood Hydrograph - 100 Yr return period .......................................................
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