- Masonry work quantity =
230cu.m
- Excavation work quantity =
140cu.m
The spillway is designed to pass a
maximum discharge of:
- 18.02cu.m/sec, if two side
spillways are closed.
- 14.92cu.m/sec, if two side
spillways are opened.
The four sluice gates are designed to
pass a maximum discharge of 1.51cu.m/
sec.
Operation Procedures: Most of the
floodwater is diverted to irrigate
adjacent agricultural land. If the four
sluice gates are closed for some period,
silt is expected to be deposited upstream
of the earth dam. Therefore, these gates
should be opened frequently to flush the
deposited silt. The sluice gates can also
be opened to meet irrigation demands
downstream. If flooding is heavy the two
side spillways are opened to increase the
passing capacity of the main spillway by
removing the timber logs. The length of
each timber log is 1.90m and its cross
section is 15 x 20cm2. The four sluice
gates can also be opened.
I2.4 Impact of the Project to date
N the first year, rainfall in the area
was extremely scarce. Nevertheless,
the wadi was filled as a result of water
channelled down from upstream.
· A total of 300 feddans were irrigated
and cultivated with vegetables and
sorghum.
· Consequently, 300 farmers benefited
from selling the crops.
· Water was stored and used for domestic
purposes for two months after the rainy
season. The subsurface water was then
used for another two months.
· The following year, the same area
was cultivated with the addition of
approximately 100 feddans more
downstream. Now in its third season,
the project has resulted in
· Over 600 feddans being irrigated
and cultivated with vegetables and
sorghum.
2.5 Problems to be Considered
1. Some of the area proposed to be
flooded is higher in elevation and
requires grading. Canals may be
necessary to allow for spreading of
water.
2. Land preparation is required before
the flooding of the area because it helps
the infiltration of water into the land to
take place more efficiently.
PRACTICAL ANSWERS
TO POVERTY
13