Contents preface (VII) introduction 1—37

13.3. DIFFERENT UNITS OF HEADWORKS
Diversion headworks (Fig. 13.1) mainly consist of a weir (or barrage) and a canal head regulator. A weir has a deep pocket of undersluice portion upstream of itself and in front of the canal head regulator on one or both sides. The undersluice bays are separated from other weir bays by means of a divide wall. In addition, river training structures on the upstream and downstream of weir, and sediment excluding devices near the canal head regulator are provided. Detailed model investigations are desirable to decide the location and layout of headworks and its component units. A typical layout of diversion head works is shown in Fig. 13.1.

Pitchedslope

CC blocks

CC blocks with

CC blocks with

Pitched

Slope3:1

without

G.F.O. over

G.F.O. over

slope

G.F.O.

inverted filter

stone filling

CC blocks

CC blocks

CC blocks

without

with G.F.O.

CC blocks

Slope3:1

G.F.O.

with G.F.O.

Slope 8:1

Slope 8:1

without

5:1

G.F.O.

Curtain

Loose stone

.

wall

protection

Flare

2

Flank

5:1

.

Flare2

wall

C of railway

Road bridge

L

Head

Axis of barrage

regulator

Stone

Crest

CC blocks

Crest

Flow

Flow

prot-

Road bridge

CC blocks

Off taking

Off taking

ection

canal

Fish ladder

over stone

canal

Divide wall

Loose stone

Road bridge

Flare

Flow

protection

2:1

2:1

Silt

Stone

Flare

excluding

protection

Slope

tunnels

Slope 3:1

Pitched

G.F.O. - Gravel-filled openings

Pitched

slope 2:1

slope 2:1