SOPIA .S. SHILLAH - TITLE EVALUATION OF THE ON-GOING CONSTRUCTION OF NAROK TOWN STORM WATER DRAINAGE SYSTEM BY SOPIA.S SHILLAH F16\/2289\/2009 SUPERVISOR

SOPIA .S. SHILLAH - TITLE EVALUATION OF THE ON-GOING...

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TITLE: EVALUATION OF THE ON-GOING CONSTRUCTION OFNAROK TOWN STORM WATER DRAINAGE SYSTEM BYSOPIA .S. SHILLAHF16/2289/2009SUPERVISOR: MR. KIPKOROS KANDIEThis project is submitted in partial fulfillment for the award Bachelor of Science Civil andConstruction Engineering, University of Nairobi.1
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ABSTRACTNarok town has experienced flooding for over several decades. The consequences being peopleand cars drowning, destruction of property and indirectly has a link to slow development; this isbecause the risks of investing in the town is increased by the frequent floods during rainyseasons; hence investors shy away or avoid investing all together. Road pavement destruction isa concern as water ingress into the sub-grade. Health and environmental impacts after thefloods are also a major concern.The study involves the evaluation of the existing major drainage system in Narok town i.e. fromKobil petrol station to Narok River, estimation of runoff, hydraulic design of open channels,culvert and comparing the with existing ones.2
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ACKNOWLEDGEMENTI hereby place on record my sincere gratitude to the following:Eng: Kipkoros Kandie, my supervisor, who at every stage in my project buildup, played aprinciple role by offering technical advice, relevant information, alterations, corrections,additions and omissions to my work.Mr. Lucas Wesonga, resident engineer for the project, who provided me with material support.Employees of meteorological department, Dagoretti, who provided me with rainfall data,analyzing the data and correction where necessary.I also acknowledge the efforts of my parents, brothers and friends, for their support in myeducation, financially and morally.SOPIA .S. SHILLAHAPRIL 2015.3
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Table of ContentsABSTRACT....................................................................................................................................................2ACKNOWLEDGEMENT..................................................................................................................................3CHAPTER ONE: INTRODUCTION...................................................................................................................61.1 BACKGROUND....................................................................................................................................61.2 PROBLEM STATEMENT.......................................................................................................................71.3 GOALS AND OBJECTIVES....................................................................................................................71.4 SUMMARY OF APPROACH, TOOLS AND METHODOLOGY...................................................................8CHAPTER TWO: LITRATURE REVIEW.............................................................................................................92.1 HYDROLOGICAL CYCLE...................................................................................................................92.2 URBAN HYDROLOGY...........................................................................................................................92.3 EFFECTS OF URBANISATION ON STROM RUNOFF............................................................................102.4 URBAN STROMWATER MANAGEMENT............................................................................................122.5 URBAN STORMWATER DRAINAGE DESIGN......................................................................................132.5.1 INTRODUCTION.........................................................................................................................132.5.2 PLANNING.................................................................................................................................142.5.3DESIGN CRITERIA...............................................................................................................142.5.4 BASIC DESIGN CRITERIA............................................................................................................212.5.5FLOOD ESTIMATION...........................................................................................................242.5.6CHANNEL DESIGN..............................................................................................................262.5.7DRAINAGE DESIGN FOR URBAN STREETS...........................................................................282.5.8DESIGN OF CULVERTS.........................................................................................................29CHAPTER THREE: RESEARCH AND METHODOLOGY...................................................................................333.1 RESEARCH APPROACH.....................................................................................................................333.2 METHODOLOGY...............................................................................................................................333.3TOOLS...............................................................................................................................................35CHAPTER FOUR: RESULTS, ANALYSIS AND DISCUSSION.............................................................................364.1 INTRODUCTION...............................................................................................................................364.2 PHOTOGRAPHY.................................................................................................................................364.3 RAINFALL DATA ANALYSIS AND DESIGN OF DRAINAGE SYSTEMS.....................................................404.3.1 RETURN PERIOD........................................................................................................................404.3.2 RUN-OFF CO-EFFICIENT.............................................................................................................414
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4.3.3 DESIGN OF THE OPEN DRAINS LFROM KOBIL PETROP STATION THROUGH THE SAMPURMPURVALLEY TO NAROK RIVER...................................................................................................................43DISCUSSION...............................................................................................................................................47CONCLUSIONS AND RECOMMENDATIONS................................................................................................48REFERENCES..............................................................................................................................................495
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CHAPTER ONE: INTRODUCTION1.1 BACKGROUND.
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