appendix a maps -...
TRANSCRIPT
Appendix A: Maps A1
Practice Manual for Small Dams, Pans and Other Water Conservation Structures in Kenya
APPENDIX A
MAPS
Annual Rainfall
Annual Potential Evapotranspiration (PET)
50 Year Rainfall Intensity 12 Hour Storm
100 Year Rainfall Intensity 12 Hour Storm
Note: Additional rainfall intensity maps are available on the web site.
Return Period Storm Duration
5 years 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 24 hour
10 years 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 24 hour
25 years 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 24 hour
50 years 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 24 hour
100 years 10 min 30 min 1 hour 2 hour 3 hour 6 hour 12 hour 24 hour
Annu
al Pr
ecipi
tation
(mm)
750
12001200
1350
150
1050
600
750
900
900
1050
450
300
1200
1200
900750
600
1200
750
1050
1050
450
1350
300
900
300
600
450
750
120013
50
450
750
900
1050
450
1200
300
1200
900
750
600
1200
1050
1350
300
900
600
450
750
BUSI
A
RUNY
ENJE
S
KAPS
ABET
ITEN
SAMB
URU
MAKU
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BUNG
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BURA
MIGO
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SWEI
N
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POKO
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RU
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MALA
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ERA
MACH
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MATU
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A
MOMB
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TRAN
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K
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O
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DA
MT.EL
GON
Esri,
DeLo
rme,
GEBC
O, N
OAA N
GDC,
and o
ther c
ontrib
utors
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
-5-5
-4-4
-3-3
-2-2
-1-1
00
11
22
33
44
55
011
022
033
044
055
Kilom
eters
050
100
150
200
250
25Mi
les
Refer
ence
Scale
: 1:2,
000,0
00
Coord
inate
Syste
m: G
CS W
GS 19
84Da
tum: W
GS 19
84Un
its: D
egree
³×
Ù
GN
MN
37°0´
658 M
ILS0°0´
0 MILS
UTM
GRID
AND
2015
MAG
NETIC
NOR
THDE
CLIN
ATIO
N AT C
ENTE
R OF
SHEE
T
Refer
ence
d from
the I
LRI S
urfac
e Clim
ate D
atase
t
Lege
nd Isohy
teTo
wnCo
untry
Boun
dary
Water
Bod
yCo
unty
Boun
dary
Annu
al Ev
apotr
ansp
iratio
n (mm
)
1600
1700
2100
1500
1400
1600
2000
1800
1600 1500
2100
1800
2000
1900
1400
1900 1800 17
00160
0
1500
1600
1400
1700
2100
2000
1500
15001600
2000
2000
16001500
1800
2000
1900
1400
1900
1800
1700
1600
1500
BUSI
A
RUNY
ENJE
S
KAPS
ABET
ITEN
SAMB
URU
MAKU
ENI
BUNG
OMA
BURA
MIGO
RI
MWEA
HABA
SWEI
N
WEST
POKO
T
NAKU
RU
THIK
A
BOND
O
MARA
LAL
MERU
KITAL
E
MALA
BA
SUBA
HOLA
BARI
NGO
HOMA
BAY
MAND
ERA
MACH
AKOS
LITEI
N
KAPS
OWAR
KAJIA
DO
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BOME
T
KURI
A
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SSA
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MATU
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A
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GO
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ANY
AHUR
URU
BUTE
RE
MUHO
RONI
MOYA
LE
NYAM
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ABIT
MALA
VA
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ANA
KAPE
NGUR
IA
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I
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NGI
SHU
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A
MOMB
ASA
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TRAN
S-MA
RA
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MAKI
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YAGA
KERI
CHO
KANG
UNDO
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TA
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K
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AS
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R
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DI
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I
KAKU
MA
LAMU
ELDO
RET
DIAN
I
KISUM
U
MARI
GAT
KEIYO
NAIR
OBI
VOI
NYAN
DO
KIBW
EZI
KOIB
ATEK
KAKA
MEGA
SOTIK
WEBU
YE
LUAN
DA
MT.EL
GON
Esri,
DeLo
rme,
GEBC
O, N
OAA N
GDC,
and o
ther c
ontrib
utors
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
-5-5
-4-4
-3-3
-2-2
-1-1
00
11
22
33
44
55
011
022
033
044
055
Kilom
eters
050
100
150
200
250
25Mi
les
Refer
ence
Scale
: 1:2,
000,0
00
Coord
inate
Syste
m: G
CS W
GS 19
84Da
tum: W
GS 19
84Un
its: D
egree
³×
Ù
GN
MN
37°0´
658 M
ILS0°0´
0 MILS
UTM
GRID
AND
2015
MAG
NETIC
NOR
THDE
CLIN
ATIO
N AT C
ENTE
R OF
SHEE
T
Refer
ence
d from
the I
LRI S
urfac
e Clim
ate D
atase
t
Lege
nd Evap
otras
pirati
on Is
oline
sTo
wnCo
untry
Boun
dary
Water
Body
Coun
ty Bo
unda
ry
Fifty
Year
12 H
our R
ainfal
l Inten
sity (
mm/hr
)
RFL@
2015
12
11
7
20
14
11
12
1213
18
13
9
1614
12
14
8
10
8 7
10
1012
20
20
11
1213
13 9
16
14
12
14
1410
8
10
BUSI
A
KAPS
ABET
ITEN
SAMB
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MAKU
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OMA
BURA
MIGO
RI
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SWEI
N
WEST
POKO
T
NAKU
RU
THIK
A
BOND
O
MARA
LAL
MERU
KITAL
E
MALA
BA
SUBA
HOLA
BARI
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HOMA
BAY
MACH
AKOS
LITEI
N
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TRAN
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RA
NARO
K
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O
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LODW
AR
SORI
KIPKE
LION
MAKI
NDU
LOKI
CHOG
IO
LAIK
IPIA
KIRIN
YAGA
KERI
CHO
KANG
UNDO
TAITA
-TAVE
TA
MARA
KWET
ELWA
K
MARA
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TANA
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R
MAUA MW
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MARI
GAT
KEIY
O
NAIR
OBI
VOI
NYAN
DO
KIBW
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KOIB
ATEK
SOTIK
WEBU
YE
LUAN
DA
MT.E
LGON
9.3
13.2
5.6
6.817
.2
15.7
8.5
16.9
11.5
8.4
8.8
Esri,
DeLo
rme,
GEBC
O, N
OAA N
GDC,
and o
ther c
ontrib
utors
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
-5-5
-4-4
-3-3
-2-2
-1-1
00
11
22
33
44
55
Lege
nd Town
Isohy
tesCo
untry
Boun
dary
Water
Body
Coun
ty Bo
unda
ry0
110
220
330
440
55Kil
omete
rs
050
100
150
200
250
25Mi
les
Refer
ence
Sca
le: 1:
2,000
,000
Coord
inate
Syste
m: G
CS W
GS 19
84Da
tum: W
GS 19
84Un
its: D
egree
³×
Ù
GN
MN
37°0
´65
8 MILS0°0
´0 M
ILS
UTM
GRID
AND
2015
MAG
NETIC
NOR
THDE
CLIN
ATIO
N AT
CEN
TER
OF S
HEET
Refer
ence
d from
the 1
987 R
ainfal
l Atla
s of K
enya
, MoW
D.
Hund
red Ye
ar 12
Hou
r Rain
fall In
tensit
y (mm
/hr)
RFL@
2015
10
15
12.5
7.5
22.5
9
9.9
7.5
12.5
20
16
10
14
17.5
17.5
15
10
12.5
1012.5
15
7.5
10
22.5
9.9
20
20
16
10
14
17.5
15
12.5
12.5
15
BUSI
A
KAPS
ABET
ITEN
SAMB
URU
MAKU
ENI
BUNG
OMA
BURA
MIGO
RI
MWEA
HABA
SWEI
N
WEST
POKO
T
NAKU
RU
THIK
A
BOND
O
MARA
LAL
MERU
KITAL
E
MALA
BA
SUBA
HOLA
BARI
NGO
HOMA
BAY
MACH
AKOS
LITEI
N
KAPS
OWAR
KAJIA
DO
KILIFI
BOME
T
KURI
A
GARI
SSA
NANY
UKI
KITUI
EMBU
MATU
NDA
GUCH
A
KINAN
GO
BUTE
RE
MUHO
RONI
MOYA
LE
NYAM
IRA
MARS
ABIT
MALA
VA
TURK
ANA
KAPE
NGUR
IA
NYER
I
UASI
N GI
SHU
NYAN
DARU
A
MOMB
ASA
KISII
TRAN
S-MA
RA
NARO
K
ISIOL
O
SIAYA
SORI
MAKI
NDU
LOKI
CHOG
IO
LAIK
IPIA
KIRIN
YAGA
KANG
UNDO
TAITA
-TAVE
TA
MARA
KWET
ELWA
K
MARA
GWA
TANA
RIVE
R
MAUA MW
INGI
KWAL
E
KYUS
O
KIAMB
U
MALIN
DI
EMAL
I
KAKU
MA
LAMU
ELDO
RET
DIAN
I
KISUM
U
MARI
GAT
KEIY
O
NAIR
OBI
VOI
NYAN
DO
KIBW
EZI
KOIB
ATEK
KAKA
MEGA
SOTIK
WEBU
YE
LUAN
DA
MT.E
LGON 13
.6
11.4
9.4
6.4 17.2
2322.5
15.9
9.5
18.9
8.39.3
7.5
9.3
7
Esri,
DeLo
rme,
GEBC
O, N
OAA N
GDC,
and o
ther c
ontrib
utors
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
-5-5
-4-4
-3-3
-2-2
-1-1
00
11
22
33
44
55
Lege
nd Town
Isohy
tes2
Coun
try Bo
unda
ryWa
ter Bo
dyCo
unty
Boun
dary
011
022
033
044
055
Kilom
eters
050
100
150
200
250
25Mi
les
Refer
ence
Sca
le: 1:
2,000
,000
Coord
inate
Syste
m: G
CS W
GS 19
84Da
tum: W
GS 19
84Un
its: D
egree
³×
Ù
GN
MN
37°0
´65
8 MILS0°0
´0 M
ILS
UTM
GRID
AND
2015
MAG
NETIC
NOR
THDE
CLIN
ATIO
N AT
CEN
TER
OF S
HEET
Refer
ence
d from
the 1
987 R
ainfal
l Atla
s of K
enya
, MoW
D.
Appendix B: Reference Drawings B1
Practice Manual for Small Dams, Pans and Other Water Conservation Structures in Kenya
APPENDIX B
REFERENCE DRAWINGS
1/17 Type Drawing I: Small Earth Dam;
2/17 Type Drawing II: Spillway for Small Earth Dam (1/2);
3//17 Type Drawing II: Spillway for Small Earth Dam (2/2);
4/17 Type Drawing III: Intake, Drawoff and Valve Chamber for Small Earth Dam;
5/17 Type Drawing IV: Cattle Trough (1/2);
6/17 Type Drawing IV: Cattle Trough (2/2);
7/17 Type Drawing V: Communal Water Point;
8/17 Type Drawing VI: Water Storage Pan, Capacity 11,600 Cubic Metres (1/2);
9/17 Type Drawing VI: Water Storage Pan, Capacity 11,600 Cubic Metres (2/2);
10/17 Type Drawing VII: Water Storage Pan, Capacity 20,000 Cubic Metres (1/2);
11/17 Type Drawing VII: Water Storage Pan, Capacity 20,000 Cubic Metres (2/2);
12/17 Type Drawing VIII: Water Storage Pan on Inclined Location, Capacity 17,000 Cubic Metres, Dug Well and Filter (1/2);
13/17 Type Drawing IX: Standard Cross Sections Concrete Sand Storage Dams;
14/17 Type Drawing X: Gabion Sand Storage Dam (1/2);
15/17 Type Drawing X: Gabion Sand Storage Dam (2/2);
16/17 Type Drawing XI: ALDEV Weir Cross Section;
17/17 Type Drawing XII: Lagoon on an Inclined Site, 38,000 Cubic Meters.
Note: Additional drawings (Autocad and PDF) available on the web site.
DAM CREST
SAND FILTER
TOE DRAIN
RIP RAP PROTECTIONIN ZONE
AFFECTED BY WAVES
N.W.L
5.00m
5.00m
1.00m
1.00m
2.00 to3.00m
4.00 to 5.00m
1.00m (min)
1.00m
CAMBER (SETTLEMENT ALLOWANCE)
SAND FILTER
CORE TRENCH
SAND FILTER
NORMAL LEVEL (N.W.L)
2.00 TO 3.00m
1.00 min
GRASSING ON 0.20m TOP SOIL LAYER
3.00m (min)
ORIGINAL GROUND LEVEL
CORE
4.00 TO 5.00m
1.00m (min)
FLOOD WATERLEVEL (F.W.L)
FLOOD SURCHARGE
GROSS FREEBOARD
11
CREST PROTECTION (MURRAM OR GRASSING)
PROTECTIVEGRAVELLAYER
0.30m (min.)
UPSTREAM SLOPE
5.00m
DOWNSTREAM SLOPE 1.00m
11
5.00m. (min.)EXCAVATION LEVEL
MINIMUM (NET) FREEBOARD
GRASSING ONTOP SOIL
SETTLEMENT ALLOWANCE
300300
200
CREST PROTECTIONSLOPE 1%CREST LEVEL WITHOUT CAMBER
4.50m5.00m
Location:
Scale:File Name:
Project:
Drawing Title:
Drawing No: Rev: Sheet:
Client:
Surveyed By:
Drawn By:
Designed By:
Checked By:
Approved By:
TYPICAL PLANSCALE 1 : 500
TYPICAL CROSS-SECTIONSCALE 1 : 200
ALTERNATIVE FILTER AND TOE ARRANGEMENT
SCALE 1 : 100
TYPICAL LONGITUDINAL SECTIONSCALES; VERT. 1 :100, HORIZ. 1 : 500
TYPE DRAWING I 1/16
AS SHOWN
SMALL EARTH DAM
5.0m
≥ 5m
INFL
OW
SE
CT
ION
SPIL
LWA
Y
CR
EST
SILL
(FIX
ED
LEV
EL)
SILL
(FIX
EDLE
VEL)
OU
TFL
OW
CH
AN
NE
L
SPILLWAYCENTRELINE
4.0m
10.0
m
i
TO
WA
RD
S R
IVE
RBE
D
AA
CC
FLO
OD
WA
TE
R L
EV
EL
(F.W
.L)
EM
BAN
KM
EN
T C
RE
ST
SLO
PE0.
3% -
1%
SPIL
LWA
Y P
RO
TE
CT
ION
TR
EN
CH
DE
PTH
1.0m
(TO
BE
CO
NST
RU
CT
ED
WH
ER
E R
EQ
UIR
ED
ON
LY)
A2/
16
Loca
tion
:
Scal
e:Fi
le N
ame:
Proj
ect:
Dra
win
g T
itle
:
Dra
win
g N
o:R
ev:
Shee
t:
Clie
nt:
Surv
eyed
By:
Dra
wn
By:
Des
igne
d By
:
Che
cked
By:
App
rove
d By
:
TY
PE D
RA
WIN
G II
TY
PIC
AL
AR
RA
NG
EM
EN
T F
OR
EA
RT
H C
HA
NN
EL
SPIL
LWA
YSC
ALE
1 : 2
50
1 : 2
50
SPIL
LWA
Y F
OR
SM
ALL
EA
RT
H D
AM
S
0.30m RIP-RAP
0.10m SAND/GRAVEL
1 to 31
F.W.L
0.10
ANGULAR RIP-RAP (0.1/0.2m) COMPACTED BYDOZER0.30
SAND/GRAVEL LAYER (COMPACTED)
NATURAL EARTH
0.3% - 1%i
0.30
0.80m
0.10
0.60 to 0.80m
≥ 5mEMBANKMENTCREST LEVEL
NATURALGROUND
F.W.L B
SPILLWAY WIDTH (w)
0.801
1 to 3
B
≈4m
1.0m 11
ORIGINAL GROUND LEVEL
SLOPE
Location:
Scale:File Name:
Project:
Drawing Title:
Drawing No: Rev: Sheet:
Client:
Surveyed By:
Drawn By:
Designed By:
Checked By:
Approved By:
CROSS-SECTION A-A (SPILLWAY CREST)SCALE 1 : 100
SILL CROSS-SECTION B-BSCALE 1 : 20
DETAIL OF SPILLWAY PROTECTIONSCALE 1 : 20
CROSS-SECTION A-A (SPILLWAY DETAILSCALE 1 : 100
CROSS-SECTION B-B PROTECTIVE TRENCHSCALE 1 : 100
3/16
AS SHOWN
TYPE DRAWING II
SPILLWAY FOR SMALL EARTH DAMS
Location:
Scale:File Name:
Project:
Drawing Title:
Drawing No: Rev: Sheet:
Client:
Surveyed By:
Drawn By:
Designed By:
Checked By:
Approved By:
INTAKE STRUCTURESECTION B-BSCALE 1 : 25
SECTION A-ASCALE 1 : 20
GROUND PLANSCALE 1 : 20
PLANSCALE 1 : 25
CLOSING TOP ENDPERFORATED PIPEOR SOLID PLUG
PERFORATED PIPE 5mmHOLES EVERY 5cm
SCALE 1 : 10
DETAIL OF DRAW PIPE WITH COLLARSSCALE 1 : 20
4/17TYPE DRAWING III
INTAKE, DRAW OFF AND VALVE CHAMBERFOR SMALL EARTH DAMS
AS SHOWN
F
E
G
B
H
C
C
A
D
SLOPE
0.05
SLO
PE
SLO
PE
0.05
SUPPLYPIPE
E
GATEVALVE
FG
STEELCOVER
H
B
AC
D
5100
2000
2000
2000 1550 LT. SEE NOTE 2 2000
DITCH IS ONLY REQUIRED IFSURROUNDING AREASLOPES TOWARDS TROUGH
DITCH LEADING TORIVER ORDEPRESSION
DITCH
1040
400
200
100
660
100100
OUTFLOW
STEEL COVER
G.S PIPEØ 50mm
100
660
2351250300780
OUTFLOW
OVERFLOW
WASHOUT PIPE 50mm G.SPIPE WITH GATE VALVE
40
200
200200
1100
600
620
CONCRETE 1:2:4REINFORCED BY WIRE MESH
100
440
Location:
Scale:File Name:
Project:
Drawing Title:
Drawing No: Rev: Sheet:
Client:
Surveyed By:
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PLANSCALE 1 : 50
FRONT VIEW H-HSCALE 1 : 20
SECTION G-GSCALE 1 : 20
SECTION E-ESCALE 1 : 20
SECTION F-FSCALE 1:20
CATTLE TROUGH
AS SHOWN
TYPE DRAWING IV 5/17
2000 2000
LT. SEE NOTE 2
LENGTH OF FOUNDATIONLF = LT + 1800
BROKEN STONE OR GRAVEL
STONE PITCHING DITCH SLOPE0.05
11002000 2000
STONE PITCHING
BROKEN STONE OR GRAVEL150
50100
450
250PLASTERING
400 200 400
200
NB:1. STRUCTURE IN 400 x 200 x 100mm CEMENT BLOCKS
PLASTERED 1 : 3 MIX ON ALL SHOWING SURFACES
2. LENGTH OF TROUGH ACCORDING TO EXPECTED HERD SIZESL.T = 5.00m - SMALL CATTLE HERDS, GOATS AND SHEEPL.T = 10.00m - BIG CATTLE HERDS
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ISOMETRIC VIEWSCALE 1 : 50
SECTION C-CSCALE 1 : 20
SECTION D-DSCALE 1 : 20
SECTION A-ASCALE 1 : 50
SECTION B-BSCALE 1 : 50
CATTLE TROUGH
AS SHOWN
TYPE DRAWING IV 6/17
ROCK OR RUBBLE FILLED TRENCH
CONNECTION TOMAIN LINE
CONCRETE DRAIN: SLOPE 4%APPROX. LENGTH ≥5m
2400
300
550
100800
2400
C C
CONNECTIONTO MAIN LINE
CONCRETE DRAINSLOPE 4%LENGTH ≥ 5m
2400
SLOPE 2.5%SLOPE 2.5%
300
100
1600
A A
B
B
ROCK OR RUBBLE FILLED TRENCH
50
300
100
5%
2000
350
150
200
100
150
500
100
250
50
100 8001800 ≥5000
200
100
250
100
100
150
1800
740300 300
700
230
2.5%
10%
300150
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PLAN 4 TAP CWPSCALE 1:40
SECTION B-BSCALE 1 : 40
SECTION C-CSCALE 1 : 40
SECTION A-ASCALE 1 : 40
PLAN 2 TAP CWPSCALE 1 : 40
SECTION THROUGH DRAINSCALE 1 : 40
7/17
1:40 OR AS SHOWN
COMMUNAL WATER POINT
TYPE DRAWING V
80.00
50.00
7.00
15.00
10.00
6.00
30.00
5.00
10.00
5.00
CATTLE RAMP
FENCE
DUG WELL
AA
BB
D DC
C
SILT TRAP
RIP RAP PROTECTION
OUTLET CHANNEL TOWARDSNATURAL DRAINAGE
0.70
0.30
0.30
RIP RAP PROTECTIONOF OUTLET CHANNEL
0.30
0.30
0.30
SILT TRAP
RIP RAP
1.00
0.30
+4.00+3.50
1:2
1.00 6.00
RIP RAP PROTECTION
21
RIP RAP PROTECTION(COVERED WITH GRAVEL)
15.00
2.50
03.0
Location:
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Approved By:CATTLE RAMP PROTECTION
SCALE 1 : 200
PLAN VIEWSCALE 1 : 500
PAN INLET CROSS SECTION F-FSCALE 1 : 200
SECTION H-HSCALE 1 : 50
SECTION G-GSCALE 1 : 50
SECTION J-JSCALE 1 : 50
WATER STORAGE PAN; CAPACITY 11,600m³
AS SHOWN
TYPE DRAWING VI 8/17
2.0010.0010.00 30.00 10.00
51
+4.00
0.00
+4.00ORIGINAL SURFACE EXCAVATED EARTH
E
E2.5
1
EXCAVATED EARTH
2.00 10.00
1.25
5.00 20.00
2.00
2.51
2.51
2.510.00
+3.50 4.00+4.00
SILL
+2.00
F ORIGINAL SURFACE
1.00
2.00
F
+4.50 +4.20
NATURAL GROUND
J
J
SILT TRAP
0.30
0.50 10.00
EARTH BERM OFCOLLECTION TRENCH
EXCAVATED MATERIALFROM PAN
max. 1.00m
0.20/0.30m STRIPPING OF TOP SOIL
0.20/0.30m TOP SOIL COVERSLOPE ≈1:10
≈2.00
≈.050
≈0.30
10.00
+4.50+4.00
H
H
G
G
EARTH BERM OFCOLLECTION TRENCH
ORIGINAL GROUND
1.00
Location:
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DISPOSED MATERIAL CROSS SECTIONSCALE 1 : 200
INLET TO SILT TRAP CROSS SECTION C-CSCALE 1 : 200
COLLECTION TRENCH CROSS SECTIONSCALE 1 : 25
CROSS SECTION A-ASCALE 1 : 500
CROSS SECTION B-BSILT TRAP DETAIL
SCALE 1 : 200
WATER STORAGE PAN; CAPACITY 11,600m³
AS SHOWN
TYPE DRAWING VI 9/17
OVERFLOW TO OUTLET CHANNEL SECTION D-DSCALE 1 : 200
INTAKE SILL
B
B60.00 25.5025.50
120.00
25.50
25.50
NOTE:EXACT LOCATION OFCATTLE RAMP AND INTAKE TO BE DECIDED FOR EACH SITE
INDEPENDENTLY(SEE LAYOUT)
MAXIMUM LEVELSANDY CLAY 4.00
COMPACTED RIP RAPLAYER 0.30m THICK
800 2500
15.00
SANDY CLAY LAYERTO BE PLACEDAND COMPACTED IFSOIL IN BOTTOMOF RAMP IS TOO PERVIOUS
0.30
0.50CONCRETE 1:2:4
40.00
10.00 10.00 6.00 5.00 4.50
0.300.00
CLAY BLANKET
1:2.54.00 1:2
7.00
4.001:1.5
C
C SANDY CLAY LAYERRIP RAP PROTECTION
0.300.00 1:2.54.00 1:2
7.00
4.001:1.5
10.00 10.00 6.005.00
4.50
SILL
2.00 2.0012.00
20.00RIP RAP LAYER
SANDY CLAY LAYER
Location:
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SILL DETAILSCALE 1 : 20
PLAN TANKSCALE 1 : 1000
CATTLE RAMP SECTION C-CSCALE 1 : 200
CATTLE RAMP SECTION D-DSCALE 1 : 500
INTAKE SECTION A-ASCALE 1 : 500
STANDARD WATER PAN CAPACITY 20,000m³
TYPE DRAWING VII 10/17
AS SHOWN
100.0010.00
6.005.00
4.50
120.007.00
4.001:1.
5 1:21:2.5
0.30 0.00CLAY BLANKET 0.30m
40.00
7.00
4.00 1:1.51:2
1:2.5
40.0010.0010.00
6.005.00
4.50
60.007.00
4.00
0.30 0.00CLAY BLANKET 0.30m
INTAKE 1:4
30.00
1:1.5 1:2
1:2.5
7.00
4.00 1:1.51:2
1:2.5
SILL
NOTE:DIMENSIONS OF WALL ARE SHOWNWITHOUT 0.15m TOP SOIL COVER
6.00 1.40 0.40
0.50
0.70
BOTTOM OF INTAKE CHANNEL
3.00
1:21:2
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SECTION B-BSCALE 1 : 500
SECTION A-ASCALE 1 : 500
INTAKE CHANNEL SILL CROSS SECTION D-DSCALE 1 : 500
STANDARD WATER PAN CAPACITY 20,000m³
TYPE DRAWING VII 11/17
AS SHOWN
6.00
A
SILT TRAP
CATTLE RAMP
+ 2.00
+ 0.00
A
7.005.00 15.00 10.00
15.00
60.00 + 6.
00
DUG WELL
50.00
FENCE
20.00
30.00 10.00
OUTLET TOWARDSNATURAL DRAINAGE
COLLECTION TRENCH
10.00
N.W.L (+4.00)
5.00
NATURAL GROUND
0.20m TOPSOIL COVER
1:2.5 1:2.5
0.30m TOPSOIL STRIPPING
+6.00
+0.00
+4.00ORIGINAL SURFACE
10.00 5.00
SAND-GRAVEL MIXTURE1.00
1.00
0.15
+4.000.10m THICK CONCRETE
MAN HOLE
COVERPUMP OPENING
1.8-0.20m
0.50
FILTER RINGGRAVEL FILLCONCRETE SEAL
FULLY CONCRETE RING
+0.00
0.501.45
0.18
0.100.12
0.10 1.25
1.00
1.25
0.70
0.150.10
E E
15mm
50mm
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WATER PAN ON INCLINED LOCATIONPLAN VIEW
SCALE 1 : 1000
DUG WELL SECTIONSCALE 1 : 100
WELL COVERSCALE 1 : 40
FULLY CONCRETE RINGSCALE 1 : 40
FILTER RINGSCALE 1 : 40
WELL COVER SECTION E-ESCALE 1 : 40
CROSS SECTION A-ASCALE 1: 500
TOP AND BOTTOM OF WELL RINGSSCALE 1 : 10
WATER PAN ON INCLINED LOCATION (17,000m³);DUG WELL AND FILTER
TYPE DRAWING VIII 12/17
0.50
1.40
0
1.001.40
2.00
3.00
4.00
5.00 b₂ bb₂
0
H
H (m)
0.50
1.00
1.50
2.00
2.50
b₂(m)
Upstream Downstream
0
1.00
2.00
3.00
4.00
5.00 b₂ b
H1 (m)
0.50
1.00
1.50
2.00
2.50
b3(m)
1.40
H3
0.65Upstream Downstream
H2
H1
HEIGHT OF WINGWALL
D = depth of overflowplus safety
0
1.001.40
2.00
3.00
4.00
b₂
H2 (m)
0.50
1.00
1.50
(m)
800
100.00
T 300
FIRM ROCK
Ø 6mmØ 8mm @ 200mm SPACING
H (m) 1 2 3 4 5T (cm) 20 25 30 35 40
THE DEPTH OF THE TRENCH MIGHT BE ALTEREDACCORDING TO THE ROCK ENCOUNTERED
650R 400
SECTIONS WITH OVERFLOW ONLY
H2
= 2.4
0m1.4
00.
60
0.80
0.65
0.50
0.50
b1=1.50m
b1=1.90m
b2=0.90m
3.80
OVERFLOWSECTIOND=0.80m
CONCRETE 1:3:6with plums
D=0.30m
H=3.20m
0.85
H1=2.90m
T=0.300.65
b2=1.40m
0.40
0.20
b2=1.0m
CONCRETE 1:3:6with plums
H = 3.80m no overflow
INCLINED LUMBER SHUTTERING
H = 3.20m D = 0.30m. overflow
VERTICAL LUMBER SHUTTERING
0.20
0.20
SECTION A-A
1. STAGE(INITIAL ELEVATION)
2. STAGE
3. STAGEFINAL ELEVATION
B B
0.50
0.20
60°
BB
A
A
NUMBER AND ELEVATIONS OF REQUIREDCONSTRUCTION STAGES HAVE TO BEESTIMATED ACCORDING TO SEDIMENTTRANSPORT OF RESPECTIVE RIVER
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DETAIL OF FOUNDATIONSCALE 1 : 50
CREST DETAILSCALE 1 : 50
STANDARD CROSS SECTIONSSCALE 1 : 100
DESIGN PROCEDURE
1. Storage requirements - H12. Q50 and length of overflow section - Depth of overflow d3. Depth of overflow plus safety
D = 1.5d + 0.10m4. Height of wing wall
H = H1 + D5. H2 = H - 1.40m
(1.40m fixed by stability calculations6. H = 1.40m - D7. Base width from graphs
NOTE: max. D = 1.40m
STANDARD CROSS SECTIONS CONCRETE SANDSTORAGE DAMS
TYPE DRAWING IX
AS SHOWN
13/17
1.00
2.50 1.00 2.00
0.30 2.00 1.00
2.00 2.00
SAND/SILT BACKFILL FORPROTECTIONSEAL
CLAYCORE
STONE COVERRIVER BED
ORIGINAL SEDIMENTS
SLOPE 1:1.5
ORIGINAL SEDIMENTS
RIVERBED
TWO GABION MATTRESSES FOREARMPROTECTION IN CASE OFSOIL ROCK FOUNDATION
CASE:SOIL OR SOFT ROCK FOUNDATIONGABIONS AND RENO MATTRESSES (DOWNSTREAM PROTECTION)EMBED 0.30-0.50m INTO FOUNDATIONCOMPACT CLAY CORE 1.0m WIDE UP TO IMPERVIOUS SUBSTRATE OR MAXIMUM 2.0m DEEPIMPERVIOUS SEAL ANCHORED 0.50m MINIMUM IN CLAY CORE
CONSTRUCTION PHASE 1: BASE GABIONS EMBEDDED IN FOUNDATION; UPSTREAM ROW OF GABIONS PLACED LENGTHWISE ACROSS THE RIVERBED; DOWNSTREAM ROW PLACED SIDEWISE ACROSS THE RIERBED (TRANSVERSE)A ROW OF TRANSVERSE GABIONS ON TOP ALIGNED WITH THE UPSTREAM ROW OF BASE GABIONSAN IMPERVIOUS SEAL IS ADDED UPSTREAM PROTECTED BY SAND/SILT BACKFILL AS SHOWN BELOW
CASE 1: SOFT ROCK/ SOIL FOUNDATION (SEE DRAWING BELOW)BASE GABIONS EMBEDDED 0.30m TO 0.50m DEEP ACCORDING TO HARDNESS OF SUBSTRATEDOWNSTREAM APRON OF TWO GABION MATTRESSES EMBEDDED 0.30m DEEPUPSTREAM CLAY CORE 1.0m WIDE DOWN ONTO IMPERVIOUS LAYER OR 2.0mMAX DEPTHIMPERVIOUS SEAL FIXED MINIMUM 0.50m DEEP IN CLAY CORE
CASE 2: HARD ROCK FOUNDATION (SEE MIDDLE DRAWING)BASE GABIONS EMBEDDED 0.20m TO 0.50m IN FOUNDATIONNO DOWNSTREAM APRON NECESSARYUPSTREAM CLAY CORE 0.30m WIDE 0.30m DEEP TO FIX THE IMPERVIOUS SEAL
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TYPICAL CROSS SECTION (PHASE 1)SCALE 1 :50
GABION SAND STORAGE DAM; WATER SUPPLY BY GRAVITYFROM SAND STORAGE DAM
TYPE DRAWING X 14/17
SAND
FILTER
SUB-SURFACE DAM
PROTECTION OF PIPE INTHE RIVER COURSE BY MASONRY ORCONCRETE OR STONE PITCHING
G.I PIPE 75mm IN STRAIGHT ALIGNMENTTO VALVE CHAMBER.IF POSSIBLE GRADIENT TOWARDSVALVE CHAMBER TO BE PREFERABLYMORE THAN 0.05
CLOSED BYPLUG
PIPE 75mmPERFORATED
LENGTH OF PIPE ACCORDING TO WATER DEMAND
50100
SAND 0.3-2.5mmSAND 2.5-5mm
GRAVEL 5-10mmGRAVEL 10-20mm
IF ROCK DOES NOT EXIST BUILD FILTERALSO BELOW PIPE OR PLASTERGROUND WITH MORTAR
GRADUATION OF FILTER CAN BE ALTEREDTO SUIT MATERIAL AVAILABLE AT SITE
100m
m L
AY
ER
S E
AC
H
75mm Ø G.IOR P.V.C PIPE
HOLES Ø 5mmEVERY 100mmOR SLOTTED PIPES
1:1.5
CASE:HARD ROCK FOUNDATIONBASE GABIONS EMBEDDED 0.30m INTO FOUNDATIONNO DOWNSTREAM PROTECTION NECESSARYIMPERVIOUS SEAL FIXED IN CLAY TRENCH 0.30 x 0.30m
0.30
PHASE 1 PHASE 1
PHASE 1
PHASE 2
HARD ROCKFOUNDATION
CLAYFILL TOFIX THE SEAL
PHASE 1SEDIMENTS
SAND/SILT BACKFILLFOR PROTECTION
OF SEALSTONE COVER
RIVER BED
2.00 0.50
1.00
0.30
0.70
1.00
min 0.30m
HARD ROCK FOUNDATION AND BANK0.50m SIDE ANCHOR INTO BANKNO SHOULDER NECESSARYBASE GABIONS EMBEDDED 0.30m IN FOUNDATION
HARD ROCKFOUNDATION
PHASE 1SEDIMENTS
min 0.30mPHASE 1 PHASE 1
PHASE 1
PHASE 2
CLAYFILL TOFIX THE SEAL
RIVER BED
0.30
PHASE 3
PHASE 2SEDIMENTS
0.500.30
ADDITIONAL PROTECTIONOF BASE GABIONS
HARD ROCK SUBSTRATE
1.00STONE COVER
SAND/ SILT BACKFILLFOR PROTECTION
SAND RESERVOIR
SUB SURFACE DAM
DRAW OFF PIPE WITH FILTERVALVE CHAMBER
PUBLIC WATER POINT
CATTLE TROUGH
RIVER
Location:
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DRAW OFF PIPE WITH FILTERSCALE 1 : 100 PIPE DETAIL
SCALE 1 : 5
FILTER DETAILSCALE 1 : 20
TYPICAL CROSS SECTION (PHASE 2)SCALE 1 : 50
TYPICAL CROSS SECTION (PHASE 3)SCALE 1 : 50
GABION SAND STORAGE DAM; WATER SUPPLY BY GRAVITYFROM SAND STORAGE DAM
TYPE DRAWING X 15/17
0.125h0.2h
h (Max 5.0m)
0.75h
0.2h (if possible)
0.2h (if possible)
Main Weir
Loose Gravel Filter
Key Into Foundation
Notes:Weir constructed of Rubble Stone Masonry with 25% mortar to 75% rock. Mortar 1:3 mix with waterproof cementWeir to be bedded on firm rock throughout.Key to be cut into foundation material as shownPipe positioned as shown with gravel filter. Scrap
Suitable downstream slope protection to be Weir Length not to Exceed 50m without buttressingWeir Height not to Exceed 5.0m
placed after construction
Reducer and 2" Gate Valve
Approx 3 meter 3" GI Pipe withStarters welded to it to fix itto Concrete
Tee and Slotted/Drilled Inlet Pipes
3 metre 3" GI with 4 times 38" dia holes
Every 5cm. (offset each row 45 deg)Include End Cap (pr similar arrangement)
Solid Foundation Material
or 30m longTake additional advice for weirs over 3.0m tall
Plaster U/S Face with 40mmWaterproof Plaster (min)
Keep Crest Width Constant based on Max Height
iron lugs should be welded on to fix pipe in wall. Location
Scale
Client
Surveyed by
Designed by
Drawn by
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Filename
Project
Drg. Title
Drg. No. Revision Sheet
ALDEV Weir.dwg Not to Scale
Standard ALDEV Weir
ALDEV Cross Section
Standard Drawing
ALDEV Project 1950
TYPE DRAWING XI A 16/17
