KERICHO COUNTYSTRATEGIC INTERVENTION

PROJECTS 2018/2019

1

7

7

0

COMPOSITE FILTRATION UNIT

PLAN

SCALE 1:60

150mm DIA DOSED WATER PIPE

FROM CHEMICAL DOSING CHANNEL

(TOP OF PIPE 25mm BELOW

TOP WATER LEVEL)

150mm THICK

DIVIDING WALL

150mm THICK

UNDERFLOW WALL

SCOUR CHANNEL

100mm WIDE

100mm GMS PIPE

150mm THICK

UNDERFLOW

WALL

150mm THICK

OVERFLOW WALL

100mm Ø

G.S. PIPE

SCOUR CHANNEL

100mm WIDE

FLAP VALVE

150mm THICK

OVERFLOW WALL

150mm DIA

OUTLET W/W

SEE DETAIL 'F'

FLAP VALVE

FLAP VALVE

C

AA

B

B

C

FLA

P V

ALV

E

150mm THICK

UNDERFLOW WALL

100mm GMS PIPE

100mm DIA.

OVERFLOW PIPE

(SEE DETAIL)

REINFORCED CONCRETE

OUTLET/BACKWASH PIPE VALVE

CHAMBER (CHAMBER C)

160mm DIA. uPVC CLASS

'B' PIPE TO CHAMBER G

1400mmX1400mm

REINFORCED CONCRETE

SCOUR/OVERFLOW

CHAMBER (CHAMBER H)

LIMIT OF CFU

PIPEWORK

(EXCLUDING

COUPLING)

LIMIT OF CFU

PIPEWORK

1400mm X 1400mm

REINFORCED CONCRETE

SCOUR/OVERFLOW

CHAMBER (CHAMBER F)

LIMIT OF CFU PIPEWORK

(INCLUDING BEND)

225mm DIA. uPVC

CLASS 'B' PIPE TO

CHAMBER E

160mm DIA. uPVC CLASS 'B'

PIPE FROM CHAMBER F

viii

vii

viv

1

B

a1

iv

EF

G

G

G

H

H

H

J

I

K

a

b

c

d

a

b

c

d

2

3

4

CHAMBER

D

CHAMBER

H

CHAMBER

G

CHAMBER

F

160mm DIA. uPVC CLASS 'B'

PIPE TO CHAMBER E

1

3

3

0

1

2

1

0

NOTES:

1. DIMENSIONS IN MM UNLESS OTHERWISE SPECIFIED

2. ABBREVIATIONS;

W/W - WASHWATER

G.M.S - GALVANIZED MILD STEEL

F.F.L - FINISHED FLOOR LEVEL

3. THIS DRAWING TO BE READ IN CONJUNCTION WITH SITE

LAYOUT PLAN, DRG No. M407/CG/TW/GK/SLP/01

4. ALL PIPEWORK DIAMETERS INDICATED ARE NOMINAL SIZES

5. ALL PIPEWORK WITHIN THE COMPOSITE FILTRATION UNIT

(CFU) UP TO THE LIMITS SHOWN TO BE QUANTIFIED WITH THE

CFU. PIPES AND FITTINGS TO BE APPROVED LINED FERROUS

PIPES AND FITTINGS.

150mm DIA. FERROUS SCOUR

PIPE FROM CHEMICAL DOSING

CHANNEL

1200mmX1200mm REINFORCED

CONCRETE SCOUR/OVERFLOW

CHAMBER TO DETAIL (CHAMBER E)

1200mm x 1200mm

REINFORCED CONCRETE

SCOUR/OVERFLOW

CHAMBER (CHAMBER G)

150mm DIA OUTLET PIPE

TO CLEAR WATER TANK

150mm DIA BACKWASH

MAIN FROM PUMP HOUSE

2

0

0

1

2

0

0

2

0

0

2

0

0

1

2

0

0

2

0

0

FFL 1857.44

CHAMBER

B

FFL 1855.37

FFL 1855.24

FFL 1855.16

FFL 1855.10

FFL 1855.65

CHAMBER

E

CHAMBER

C

160mm DIA. uPVC

CLASS 'B' PIPE TO

CHAMBER H

1200mmX1200mm

REINFORCED CONCRETE

SCOUR/OVERFLOW

CHAMBER (CHAMBER B)

LIMIT OF CFU PIPEWORK

(INCLUDING BEND)

150mm DIA.FERROUS

SCOUR PIPE TO

CHAMBER D

LIMIT OF CFU

PIPEWORK

(INCLUDING

COUPLING)

225mm DIA. uPVC CLASS

'B' PIPE TO CHAMBER

TO NATURAL DRAIN

200

1400

200

200

1400

200

200

1400

200

200200

1400

2

0

0

1

4

0

0

2

0

0

2

0

0

1

4

0

0

2

0

0

1

4

0

0

2

0

0

2

0

0

1

4

0

0

2

0

0

2

0

0

1

2

0

0

2

0

0

2

0

0

1

2

0

0

2

0

0

150mm DIA. FERROUS SCOUR

PIPE FROM STILLING WELL

100mm DIA.

SCOUR VALVE

100mm DIA.

90° BEND

1200mm X 1200mm

REINFORCED CONCRETE

SCOUR/OVERFLOW CHAMBER TO

DETAIL (CHAMBER D)

LIMIT OF CFU PIPEWORK

(INCLUDING BEND)

b

c

d

FFL 1855.45

2

0

0

2

0

0

2

0

0

1

2

0

0

2

0

0

1

2

0

0

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

MATERIALDIAMETER (mm)

DEPTH IN mm LOCATION

GRAVEL 38-20 75 BOTTOM

20-12 75 "

12-5 75 "

5-2 75 "

COARSE SAND

EFFECTIVE SIZE

1.0 75 MIDDLE

SAND EFFECTIVE

SIZE

0.5

UNIFORMITY

COEFFICIENT

1.5 750 TOP

TOTAL THICKNESS OF FILTER BED 1125

50mm G.M.S. PIPES REQUIRED

OVERALL LENGTH NO. OF HOLES

PER PIPES

NO. REQUIRED

900 5 4

1300 7 2

1700 9 2

2100 11 4

REQUIRED 96 NOZZLES IN ALL

COLLECTION WEIR

(SEE DETAIL)

CLASS 25/20

CONCRETE

FOOTING

100mm WIDE CHANNEL

FORMED IN CONCRETE

BENCHING

225x150mm CONCRETE OR

MASONRY BLOCKS

2:1 SAND/CEMENT

PLASTER 10mm THICK

200mm PIPE

225X150mm CONC. OR

MASONRY BLOCKS

MINIMUM WORKING

WATER DEPTH 250mm

SAND (750mm)

COARSE SAND (75mm)

GRAVEL 300mm

170mm W/W CHANNEL

50mm G.M.S. PIPES

(LATERALS) IN FLOOR

TO DETAIL 'F'

PUDDLE FLANGE

WELDED ON

R.C. LINTEL TO DETAIL

1 NO. 12mm BAR IN

EACH COURSE

2 NO. 12mm BAR IN

EACH COURSE

2 NO. 16mm BAR IN

EACH COURSE

150mm Ø

WASHWATER

OUTLET PIPE

15

0

SECTION A-A

SCALE 1:50

150mm DIA. BACKWASH MAIN

FROM BACKWASH WATER

TANK

NOTE:

PIPEWORK TO BE ARRANGED SO

THAT A MINIMUM WORKING DEPTH

OF 250mm IS ASSURED

CLASS 15/20 CONCRETE

SURROUND TO PIPES

3000 2300 3000

FILTER MEDIA DETAILS

8900

10

0

20

0

450

30

0

75

75

0

2 NO. 8mm BAR IN

EACH COURSE

1 NO. 8mm BAR IN

EACH COURSE

WASH WATER

COLLECTOR

225x225mm CONCRETE OR

MASONRY BLOCKS

450

50

0

CLASS 20/20 CONCRETE

BENCHING

DETAILS OF LATERALS

CLASS 25/20 CONCRETE

BASE SLAB

FGL

FGL FGL

FGL

PRECAST CONCRETE

COVER TO DETAIL

LIMIT OF CFU PIPEWORK

UPTO COUPLING

15

04

50

150150150

150

PRECAST CONCRETE

COVER TO DETAIL

50

20

0

20

0

VENT (ONE BLOCK

OMITTED) WITH WIRE

GAUZE

50mm THICK BLINDING

CONCRETE CLASS 15/20

1400mm x 1400 x 2700mm DEEP

REINFORCED CONCRETE

SCOUR/OVERFLOW CHAMBER

13

70

viii

vii

vi

v

iv

iii

ii

i

5

67

8

9

8

10

B

D

E

F

G

H

I

FFL 1856.46

FFL 1856.46

FL 1855.16

3 N

O. 1

6m

m B

AR

IN

E

AC

H C

OU

RS

E

30

0

50

50mm THICK BLINDING

CONCRETE CLASS 15/20

M.S STEP IRONS AT

300mm C/C

NOTES:

1. DIMENSIONS IN MM UNLESS OTHERWISE

SPECIFIED

2. ABBREVIATIONS;

W/W - WASHWATER

G.M.S - GALVANIZED MILD FERROUS

F.F.L - FINISHED FLOOR LEVEL

3. REINFORCEMENT BARS ARE MILD FERROUS

ROUND BARS TO B.S 4449.

4. ALL PIPEWORK DIAMETERS INDICATED ARE

NOMINAL SIZES

5. ALL PIPEWORK WITHIN THE COMPOSITE

FILTRATION UNIT (CFU) UP TO THE LIMITS SHOWN

TO BE QUANTIFIED WITH THE CFU. PIPES AND

FITTINGS TO BE APPROVED LINED FERROUS

PIPES AND FITTINGS.

250

250 1400 250

250

4001400

300

100

TWL 1859.64

1855.65

18

50

90

0

15

0

15

0

600mm WIDE R.C WALKWAY

600mm WIDE R.C WALKWAY

29

30

20

0

GUARDRAIL TO DETAIL (M407/SD/16)

450

150mm DIA. OUTLET PIPE

TO TREATED WATER TANK

CHAMBER

F

CHAMBER

C

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

COLLECTION WEIR

3000

PIPE END THREADED TO

FIT Ø 200mm G.S. NUT

(INLET PIPE TO BE SET AT LEAST 25mm ABOVE OUTLET PIPE)

200mm Ø

G.M.S. CAP

150

WALL

THESE WALLS NOT TO BE

BUILT UNTIL PERIMETER

WALLS HAVE BEEN PLASTERED

4 NO. 16mm Ø BARS 12 NO. 8mm Ø BARS @

250mm C/C

FILTER SAND

SECTION B-B

100 200

150

150

THESE WALLS NOT TO BE

BUILT UNTIL PERIMETER

WALLS HAVE BEEN

PLASTERED

SECTION C-C

℄ OF FLAP VALVE

150mm DIA. FLAP VALVE 1

NO. SUCH VALVE ON EACH

SIDE OF WALL (SEE PLAN)

CONCRETE

CLASS 25/20 8mm

LINKS @ 250mm

c/c 12no.

4No. 16mm BARS

HOOKED AT EACH END

22

30

24

20

200x200mm G.M.S. COLLECTION WEIR

TROUGH (PAINTED WITH 2 COATS OF

APPROVED EPOXY PAINT

20

0

CLASS 25/20 R.C.

LINTEL

15

0

20

0

50

7

5

6

NOTES:

1. DIMENSIONS IN MM UNLESS OTHERWISE

SPECIFIED

2. ABBREVIATIONS;

W/W - WASHWATER

G.M.S - GALVANIZED MILD FERROUS

F.F.L - FINISHED FLOOR LEVEL

15

01

50

90

0

GUARDRAIL TO DETAIL (M407/SD/16)

600mm WIDE R.C WALKWAY

29

30

20

0

450 150

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

200

200

20

020

02

00

200 200 200 200 200

300 T

O ℄

OF

C

HA

NN

EL

300 T

O ℄

OF

C

HA

NN

EL

CHANNEL COVER OF 6mm M.S.

PLATE 250mm X 2100mm, 2 NO.

REQUIRED

SLOT IN CHANNEL COVER 20mm x

150mm AT 200mm c/c to MATCH

PIPES (SIMILAR SLOTS IN PIPES

AT CORRESPONDING LOCATIONS)

50

50

50

150mm NIPPLE

150mm TEE

PLAN DETAIL 'F'

D D

E

150mm DIA. WASH WATER

OUTLET PIPE

'HUDO' NOZZLES

LOAD BEARING FLOOR OF

CLASS 25/20 CONCRETE AND

10mm BARS @ 200mm c/c

BOTH WAYS

'HUDO' NOZZLES

CLASS 15/20 CONCRETE

SURROUND

150mm NIPPLES

INTO CHANNELS

WASH WATER CHANNEL OF 3mm M.S. PLATE 170mm

DEEP x 200mm WIDE X 2050mm LONG SET IN CLASS

15/20 MASS CONCRETE 2 NO. REQ.

SECTION D-D

SECTION E-E

DETAIL OF OVERFLOW PIPE

TO OVERFLOW DRAINAGE

CHAMBER

100mm 90°

BEND

100mm 90°

BEND

150x100mm REDUCING

SOCKET

665

150mm WALL

60

CONCRETE

BLOCK

19

0

150mm FLANGE

500

300

150

400

150mm DIA. WASH WATER

INLET AND FILTERED

WATER OUTLET

CLASS 15/20 MASS

CONCRETE SURROUND

LOAD BEARING FLOOR OF

CLASS 25/20 CONCRETE AND

10mm BARS @ 200mm c/c

BOTH WAYS

NOTE:

UNDERDRAIN PIPES AND CHANNELS TO BE

SECURED AS DIRECTED BY THE ENGINEER

WITH NO.8 GAUGE WIRE STIRRUPS PRIOR TO

PLACEMENT OF MASS CONCRETE

20x150mm SLOTS IN

UNDERSIDE OF PIPES

150

SECTION SHOWING INSTALLATION

OF 'HUDO' NOZZLE

N.T.S

TOP LEVEL

'HUDO' NOZZLES AT 150mm c/c IN

TOP HOLE DIA 19mm IN AC PIPE.

SIZE OF HOLE MAY BE ALTERED

IF HUDDO NOZZLE IS

UNAVAILABLE

TWO SLOTS 20mm WIDE x 100mm

LONG IN BOTTOM, 450mm c/c TO

MATCH WITH W/W CHANNELS

50mm G.M.S. PIPE

AIR HOLE

SLOTS IN MS PLATE

CLASS 15/20 CONCRETE

15mm DIA

.

B

E

A

B

D

E

v

iv

iii

e

f

g

h

g

f

g

i

A

NOTES:

1. DIMENSIONS IN MM UNLESS OTHERWISE

SPECIFIED

2. ABBREVIATIONS;

W/W - WASHWATER

G.M.S - GALVANIZED MILD FERROUS

F.F.L - FINISHED FLOOR LEVEL

E

C

36

0

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

FILTER

SAND

TYPICAL ELEVATION 1

1200mm WIDE WALKWAY

150mm THICK

DIVIDING WALL

150mm X 50mm RHS

CHEQUER PLATE 6mm

THICK

100mm x 100mm RHS

COLUMN (2 No.)

15

0

300

6mm ANGLE LINE

CHEQUERED PLATE 6MM THICK

175

FINISHED

GROUND

LEVEL.

300

15

0

4

5

°

4

5

°

2850

250

17

5

175

175

60

0

90

0

300mm X 300mm MASS

CONCRETE FOOTING

3250

90

0

TYPICAL ELEVATION 2

1200

12

00

PLAN

ANGLE LINE.

100mm X 100mm RHS

12

003250

2850

SECTION G-G

CHEQUE PLATE 6mm

THICK

ANGLE LINE

ANGLE LINE.

150

150mm THICK

UNDERFLOW WALL

1200

TYPICAL ELEVATION OF STAIRCASE

150mm X 50mm RHS

BEAM

LEVEL HANDRAILS

NOTES:

1. DIMENSIONS IN MM UNLESS OTHERWISE SPECIFIED

2. ABBREVIATIONS;

W/W - WASHWATER

G.M.S - GALVANIZED MILD FERROUS

F.F.L - FINISHED FLOOR LEVEL

3. REINFORCEMENT BAR ARE MILD FERROUS ROUND BARS TO

B.S 4449

4. ALL PIPEWORK DIAMETERS INDICATED ARE NOMINAL SIZES

5. ALL PIPEWORK WITHIN THE COMPOSITE FILTRATION UNIT

(CFU) UP TO THE LIMITS SHOWN TO BE QUANTIFIED WITH

THE CFU. PIPES AND FITTINGS TO BE APPROVED LINED

FERROUS PIPES AND FITTINGS.

4

2

0

0

G

G

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

NOTES

³

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

³

KERICHO COUNTY

STRATEGIC INTERVENTION

PROJECTS 2018/2019

NOTES

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

TYPICAL AIRVALVE AND FIRE

HYDRANT CHAMBER

Client

KERICHO COUNTY

BEDDING AND SURROUND TO PIPES

PIPE Ø SURROUND TYPE "C"

PIPE Ø SURROUND TYPE "B"

PIPE Ø SURROUND TYPE "A"

150

300

100

150 150300mmØ 150300mmØ150

100

300

150300mmØ150

100

300

TYPICAL TRENCH

1:10

400DIA 400

1200 (M

IN

C

OV

ER

)

300

VA

RIES (M

IN

900)

300

DIA

150

400 DIA400

1:10

TRENCH IN ROCK

PIPE BEDDING DETAIL IN

BLACK COTTON SOIL

1:10

200 DIA 200

VA

RIES (M

IN

1100)

100

DIA

150M

M

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

TYPICAL BEDDING & HAUNCHING

TO PIPE DETAILS

Client

KERICHO COUNTY

43

3738.58.53

73

80

10

8

511

34

21.5

40

80

600

3

1:25

30

50 50

100

80

40

40

3

600

7525

25

5050

75

80

25

60050 50

80

700

100

150

150

350

350

175 75 17575

50

100

80

NOTES

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

COMPOSITE CHAMBER COVER

Client

KERICHO COUNTY

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

INDICATOR POSTS

Client

KERICHO COUNTY

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

TYPICAL PIPE TRENCHES

Client

KERICHO COUNTY

³Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

THRUST BLOCK DETAILS

Client

KERICHO COUNTY

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

TYPE 1 VALVE CHAMBER

Client

KERICHO COUNTY

NOTES:

Description

DateRev.

Scale

Title

Sheet

Drawing No.

Checked Date

Rev.

Design Drawn

Project

REPUBLIC OF KENYA

STRATEGIC INTERVENTION

PROJECTS 2018-2019 FINANCIAL

YEAR

G.B J.K

G.B Oct' 18

1:502 of 2

A

STANDARD DRAWINGS

TYPICAL WASHOUT AND OUTFALL

DETAILS

Client

KERICHO COUNTY