1. WATER INSTITUTE
DEPARTMENT: WATER RESOURCES
AND IRRIGATION ENGINEERING
PROGRAM: Bachelor degree in water
resources and irrigation engineering
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2. PROJECT TITLE:
PLANNING AND DESIGN OF
STORMWATER DRAINAGE SYSTEM AT
MBOGWE,GEITA.
STUDENT NAME:GADAMA KULWA
REG NO: BD/2014/WRIE/37
SUB:18 DECEMBER,2018
1/24/2018
3. 1.0 INTRODUCTION
• Stormwater drainage is the science of draining
that part of rainfall which appears on the
surface. With increasing urbanization it
becomes increasingly important but is far too
often neglected or relegated to an afterthought
in the development of urban infrastructure.
This science is important because unattended
high flood levels can cause property damage,
loss of life and other
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4. Cont.…………..
• contaminating the ground with sewage from
flooded septic tanks and pit latrines. In the
past, attention to this problem has been
severely limited, especially in Masumbwe
ward areas. with the consequence that in the
rainy seasons, poorer residents having access
to it, use pounded, polluted surface water even
when potable water is available at kiosks and
the overflow from pit latrines in particular and
cause of disease outbreaks such as cholera.
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5. 1.1 BACKGROUND
Drainage is the term used to describe natural or
artificial removal of surface and subsurface
water from the area. The significance of
drainage is to maintain cleanness of an area
against odor, flies and epidemic disease.
Stormwater is water that originates during
precipitation events. It may also be used to
apply to water that originates with snowmelt
that enters the storm water system.
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6. Cont.……..
Stormwater that does not soak into the ground
becomes surface runoff, Storm water is of concern
for two main issues: one related to the volume and
timing of runoff water (flood control and water
supplies). The traditional approach to handle
stormwater from Mbogwe still used traditional
canal as drainage. That resulted by infrastructures
that hander infiltration and concentration
stormwater flow, this approach has several impact
to environmental that’s heavy metal, organic
material and oil in stormwater.
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7. 1.2 PROBLEM STATEMENT
Mbogwe District is one of the
five districts of Geita Region of Tanzania. Due to
geographical of the area the stormwater from the
catchment area is accumulated at a lower land.
Most stormwater originated due to rainfall water
that accumulates to one point resulted from roof
or catchment. If the situation remains unsolved it
will risk health of the people in the area through
epidemic diseases such as cholera(occurred
1999&2012), dysentery and destruction of
infrastructure.
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8. Cont.………….
On the other hand houses are inhabitable and
playgrounds are not functioned during the
rainy season.
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9. 1.3 OBJECTIVE OF THE STUDY
General object
The objective of this study is investigating,
planning and design of stormwater drainage
system at Mbogwe, Geita from point to the
discharge as method of removing accumulated
water point.
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10. Cont.……
specific objective
Determination of peak discharge
Performing of leveling point to discharge
Designing of open channel for stormwater
drainage system
Assess of quality and quantity of drainage
system of stormwater for rice cultivation.
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11. 1.4 Project area
• Mbogwe District is one of the five districts
of Geita Region of Tanzania. It is bordered to
the north by Chato District and Geita District,
to the east by Kahama District and Kahama
Urban
• This place is situated at geographical co-
ordinate 3°22°0’’ south and 32°16°00’’East, its
climatic information varies as 31/24℃ and its
wind direction is 30km/hr.
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12. 1.5 SCOPE OF THE STUDY
The scope of this study to design of open
channel as drainage system from point to direct it
to the discharge approximate of more than
1.2km.
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13. 1.7 SIGNIFICANT OF THE STUDY
• The study will give to the suggestion of user’s
at the end of project to undertake care of
stormwater and use of open channel designed
either for rice cultivation or directing to dam
for dry season use. Also will help to access the
main sources of accumulated stormwater at the
point.
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14. 2.0 LITERATURE REVIEW
This will help to enable general information
about these topics
Cause of stormwater
Effect resulted from stormwater
Designing criteria of open channel hydraulics
Procedure in determination of quantity and
quality of stormwater
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15. 3.0 METHODOLOGY
Determination of peak discharge
• determination rainfall intensity
• Rational method
• Regression data and statistics analysis
method
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16. Cont.………
Topographical survey
• Reconnaissance
• Fieldworks(visiting site)
• Office work in compelling data into excel
• Plotting of profile, contour and cross section
using software AutoCAD 2017&2017 3D
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17. Cont.………
Designing of open channel(drainage) for
stormwater drainage system
• Collecting of hydrological and metrological
data from Mbogwe council/TMA
• Determination of discharge by manning
coefficient method
• Determination of total drainage area
(Catchment area) ‘A’ by AutoCAD 2017 3D
software and GIS after collecting co ordinate
points.
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18. Cont.……
Assess of quality and quantity of drainage
system of stormwater for rice cultivation
• Laboratory determination of NO2
-
• Laboratory determination of pH( acidity &
basicity) of stormwater by pH meter.
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19. Appropriate formula to be used
•
•
Determination of quantity Discharge (Q)
Using rational formula
Q =CIA
Where;
Q = Flood peak of Catchment (m3/sec )
C = Rational runoff Coefficient
I = Average rainfall Intensity over the
whole Catchment
A=catchment area
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20. Cont.………
• Velocity of flow can be determined by
Manning’s formula
𝑉 = 1/𝑛 ∗ 𝑅2/3 𝑆½
Where: V= Allowable flow velocity
n = Manning’s roughness coefficient.
R = Hydraulic radius (m)
S = Bed slope of the channel taken as ground
slope
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21. 3.1 Data collection
This referred as process of gathering
information and measuring information on target
variable, this project data collection method used
was
field work,
reconnaissance of data,
Collecting of hydrological and metrological
data from Mbogwe council,
collection of rainfall data intensity from TMA
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22. 3.2 Data analysis
Data resulted to inspecting, cleansing,
transforming and modeling of data. This data
will be analysis in
• Table form,
• graph method,
• histogram,
• bar chart,
• profile and contour.
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23. 4.0 working plan(schedule)
2017 2018(Duration in months)
Activities NOV DEC JAN FEB MARC APRIL MAY
Writing project proposal
Presentation of project
proposal
Literature review
Data collection at mbogwe
district
Data sampling at WI
laboratory
Data analysis and compiling
Design of open channel
Presentation of project report
Submission the project report
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24. 5.0 BUDGET
S/
N
Activities amount Sources
of
income
1 Travelling to Mbogwe 100,000 Sponsor
2 Hiring and purchase of
equipment’s
50,000 Sponsor
3 Laboratory work at WI 50,000 HESLB
4 Surveying works, meal and
accommodation
300,000 HESLB
5 Unskilled labor 100,000 PARENTS
6 Stationary works 50,000 HESLB
TOTAL 650,000
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25. 6.0 REFERENCE
• R.Chudley (1995), Building construction hand
book, 2nd Edition, St Edmund press.
• Duggal K.N (2002), Elements of Environmental
Engineering, Chand and Co. Ltd.
• S. N. Ghoshi (1986), Flood Control and
Drainage Engineering, 2nd Edition
• A. Kamal (1989), Water supply, Sanitary
Engineering and Pollution, Environment
Engineering, 1st Editi
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