Month

Suitable Regional Distribution

Growth factors for return periods

Remark

20

40

50

100

June

GEV

1.767

1.945

1.998

2.155

Region contains 19 districts excluding Bilaspur, Jashpur, Surguja, Koriya

GN

1.762

1.946

2.003

2.175

PT-III

1.762

1.942

1.998

2.163

Wakeby

1.78

1.954

2.004

2.145

July

Wakeby

1.501

1.654

1.702

1.851

Region contains 22 districts except Bilaspur

August

GEV

1.489

1.592

1.623

1.711

Region contains 22 districts except Bilaspur

GN

1.486

1.596

1.63

1.73

PT-III

1.486

1.595

1.628

1.726

Wakeby

1.489

1.612

1.65

1.762

September

Wakeby

1.671

1.803

1.84

1.939

Region contains 20 districts except Bilaspur, Nawarangpur, Gadachiroli

October

Wakeby

2.446

2.721

2.796

2.994

Region contains 22 districts except Bilaspur

Inflow to Hirakud dam

Inflow

GL

2.465

3.184

3.449

4.406

Taking the inflows of all monsoon months for 53 years observed between 1958-2010

GEV

2.526

3.211

3.454

4.295

GN

2.571

3.215

3.436

4.163

Wakeby

2.586

3.255

3.483

4.24