The Gayatri Reservoir is constructed across Suvarnamukhi river near Kariyalla village in Hiriyur Taluk of Chitradurga district in the year 1963. The total length of the reservoir is 1021.53 m with gross storage capacity of 27.63 mcum (0.97 TMC), dead storage capacity of 9.55 mcum (0.34 TMC) & live storage capacity of 18.08 mcum (0.63 TMC). The total water spread area of the reservoir is 1831.00 Sq Km.
| Name of the project | Gayathri Reservoir Project |
|---|---|
| Name of the river | Suvarnamukhi |
| Location of dam | Near Kariyala village of Hiriyur taluk in Chitradurga District |
| Longitude | 760 44′ 00″ E” |
| Latitude | 140 47 0 N |
| Status | Completed |
| Total Catchment area | 1831.00 sq km ( 707.00sq mile) |
| Independent catchment area | 365.00 sq km ( 141.00sq miles) |
| Intercepted catchment area | 1466.00 sq km ( 566.00sq miles) |
| Nature of catchment | Plain and hilly region with a mean annual rainfall of 584 mm |
| Mean annual rainfall | 584 mm (23 inches) |
| Climate | Moderate with annual mean temperature of 310 C |
| General Characteristics of Soil in the Command area | Red & B C Soil |
| Average yield at dam site | At 75% dependability:-19.58 mcum (691.65 mcft) |
| At 50% dependability : 32.90 mcum (1161.71 mcft) | |
| Yield available from Boranakanive reservoir (which is intercepted catchment) is 12.52 mcum and the yield available from the independent catchment area is 2.82 mcum i.e., totally 15.34 mcum of yield is available at site. | |
| Geological features | 1.Regional geology :- Granites and granitic gneissis of peninsular gneissic comlex exist. |
| 2. Geology at dam site :- Highly foliated and weakened chlorite schists and quartzites of dharwar super groups exists at the site. |
| Gross storage capacity | 27.63 mcum (0.97 tmc) |
| Dead storage capacity | 9.55 mcum (0.33 tmc) |
| Live storage capacity | 18.08 mcum (0.64 tmc) |
| Capacity at FRL | 27.63 mcum (0.97 tmc) |
| Capacity at MDDL | 9.55 mcum (0.33 tmc) |
| Reservoir Evaporation Losses | 5.67 mcum (0.20 tmc) |
| Reservoir filling & depletion details | |
| a. Filling period | 627.45m (1997) |
| b. Depletion period | 623.80m (2004) |
| Levels in Mts\Ft | |
| Average river bed level | RL 612.52 m (RL 2009.60 ft) |
| Lowest foundation level | RL 610.08 m (RL 2001.60 ft) |
| Dead storage level | RL 622.27m (RL 2041.60 ft) |
| Full reservoir level | RL 626.85m (RL 2056.60 ft) |
| Maximum reservoir level | RL 628.98m (RL 2063.60 ft) |
| Minimum Draw down level | RL 622.27m (RL 2041.60 ft) |
| Crest level | RL 626.85m (RL 2056.60 ft) |
| Top of dam level | RL 629.18m (RL 2064.30 ft) |
| Masonary dam | —- |
| Earthen Dam | RL 629.18m (RL 2064.30 ft) |
| Top of Parapet Level | —- |
| Maximum Water spread area | 566.96 ha ( 1400.39 acres) |
| Type of dam | Composite type |
| Length of the dam (kms) | 1.021 Kms |
| Max height of dam above deepest foundation level (Mts/Fts) | Earthen dam=13.55m (44.45 ft) |
| Max height of dam above lowest river bed level (Mts/Fts) | 16.66 m |
| (RL 629.18 m – RL 612.52m) | |
| Top width of dam(Mts/Fts) | 3.65 m (12 ft) |
| Slopes in Dam section | — |
| a. Earthen Dam (upstream) | U/S: 1.50:1 |
| b. Earthen Dam (downstream) | D/S: 2:1 |
| c overflow section (upstream) | Central Ogee way |
| d overflow section (downstream) | Central Ogee way |
| Drainage Gallery | NA |
| a.Length Left side(Mts/Fts) | NA |
| Right side(Mts/Fts) | NA |
| b.Size(Mts/Fts) | NA |
| c.Floor Level(Mts/Fts) | NA |
| Spillway | |
| Type | Central Ogee way |
| Total Length | 65.53 m (215 ft) |
| Discharging Length | 65.53 m (215 ft) |
| Crest width | Ogee way type |
| Crest Level | RL 626.85m (RL 2056.60 ft) |
| No of crest gates | No |
| Maximum Flood intensity | 441.75 cumecs (15600 cusecs) |
| Maximum Flood lift | RL 628.98m (RL 2063.60 ft) 2.13 m above crest level |
| Maximum Discharging capacity over spillway | 441.75 cumecs (15600 cusecs) |
| Energy dissipating arrangements | Stilling basin of 18.29 m length with 0.90m high RCC end wall to provide water cushion. |
| River sluice | No |
| Irrigation Sluice | Two ,Left bank sluice/Right bank sluice |
| Numbers | 01 + 01 |
| Location | Ch 168.90 m & 808.73m |
| Size | 1.15 x 1.45 m (3 9 x 4 9) |
| 1.45 x 1.45m (4 9 x 4 9) | |
| Types of gates | Rectangular Gates/ Rectangular Gates |
| Sill level | RL 622.27 m (RL 2041.60 ft) |
| Discharge(Cumecs/Cusecs) | LBC=75 cusecs |
| RBC=125 Cusecs |
| Particulars | Left bank canal | Right bank canal | Branch canal (if any) | High level canal (if any) | Low level canal (if any) |
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 |
| Take off From | It is from left side of the saddle dam | It is from right side of the Non over flow section | In LBC- No branch canals | No | No |
| In RBC- 1) Hunisehalli branch canal 2) Ujjanakunte branch canal | |||||
| Length(km) | 23.00KM | 16.00KM | Hunisehalli branch canal=3.50km | – | – |
| Ujjnakunte branch canal=7.00km | |||||
| No of Distributories | 18 | 17 | 9+7=16 | — | – |
| Capacity of Head (Cumecs/Cusecs) | 75 Cusecs | 125 Cusecs | – | — | – |
| Croping pattern | As per original paddy | As per original paddy | As per original paddy | — | – |
| As per actual garden | As per actual garden | As per actual garden | |||
| Total irrigated area in Acre/Ha | 1164.00Ha | 1141.00 Ha | (Included in RBC) | — | – |
| Taluk/Dist benifited | Hiriyur & sira/ Chitradurga/Tumkur | Hiriyur & sira/ Chitradurga /Tumkur | Hiriyur & sira/ Chitradurga /Tumkur | — | – |
| Lined/Unlined (km) | 15.600 km / | 16.00 km | 0.600km/ 2.50km | — | – |
| Authorised capacity Cumecs/Cusecs | 75 Cusecs | 125 Cusecs | – | — | – |
