ENG09032 2019 Drainage Systems Design and Flood Management

General Details

Full Title
Drainage Systems Design and Flood Management
Transcript Title
Drainage Systems Design and Fl
N/A %
Subject Area
ENG - Engineering
CENG - Civil Eng. and Construction
09 - NFQ Level 9
05 - 05 Credits
Start Term
2019 - Full Academic Year 2019-20
End Term
9999 - The End of Time
Brian McCann, John Casserly
Programme Membership
SG_ERENG_N09 202000 Certificate in Engineering in Road Engineering and Design SG_EROAD_M09 201900 Master of Engineering in Road and Transport Engineering SG_EROAD_O09 201900 Postgraduate Diploma in Engineering in Road and Transport Engineering

This module examines aspects drainage systems design related to roads, commercial development and domestic developments. The module also examines the measurement and interpretation of hydrological data, flood prediction and prevention, flood risk assessment and policy relating to flood risk control, Section 50 applications and the Irish Coastal Protection Strategy Study.

Learning Outcomes

On completion of this module the learner will/should be able to;


Define, quantify and formulate the hydrological cycle, surface runoff, infiltration and rainfall/runoff correlation.


Carry out hydrological analysis using various techniques, predict maximum flood runoffs and design flows for natural channels, pipes and culverts. 


Appraise concepts of Sustainable Urban Drainage and apply to worked examples of source and site drainage controls. 


Critically evaluate concepts of groundwater flow, aquifers and groundwater contamination.


Interpret hydrological data and predict flood events


Design a sustainable drainage system


Estimate the hydraulic capacity of a culvert or bridge in a river channel

Teaching and Learning Strategies

This module will be delivered using online lectures and workshops.

Module Assessment Strategies

The students will be required to carry out a major project which will require the design of a sustainable surface water drainage system, inclusive of attenuation and treatment systems. The regional flood controls and prevention techniques used by the relevant government bodies in Ireland will also be examined by the incorporation of a preliminary flood risk assessment requirement in the project brief. 

The student will be required to carry out a project on the estimation of the hydraulic capacity of a bridge or culvert. This will include the estimation of 100 year year flood event with allowance for climate change and the prediction of flood levels corresponding to this event using a 1-D hydraulic model.


Final Exam

Repeat Assessments

The repeat assessment for  this module will involve resubmission of failed projects and the sitting of the final written examination.

Indicative Syllabus

1. Hydrological Cycle, infiltration, surface runoff, catchment characteristics, rainfall data collection and  correlation, extreme rainfall events in Ireland, sources of flooding, soil moisture deficit. Rainfall hyetographs, runoff hydrographs, catchment characteristics, unit hydrographs, synthetic hydrographs. Available hydrometric and hydrological data and where to access it.

2. Energy and Continuity equations. Steady uniform flow, steady non uniform flow, unsteady flow. The Manning equation and its limitations. Normal depth of flow. Runoff estimation for surface water design. Design rainfall intensities Department of the Environment and Local Government, National Roads Authority, UK Standing Technical Committee for Sewers and Watermains Modified Rational Method. Greenfield runoff in larger catchments. Institute of Hydrology 124, Flood Study Report 1975, Flood Estimate Handbook,  Flood Study Update 2013, Growth curves for Irish conditions and their estimation. The Wallingford procedure and flood study report method for expanding rainfall data relating to flood events for estimating runoff and attenuation volumes . Worked pipeline design examples to various standards of pipelines and attenuation storage volumes. 

3.  Sustainable Drainage Design (SuDS). Definition and objective of SuDS.  Pollutants associated with runoff. Aquifers and groundwater pollution and recharge. Definition of regional local and poor aquifers. Geological Survey of Ireland (GSI). Turlough and karst limestone aquifers.  SuDS components, features of pretreatment, gullies, silt traps , soak pits, petrol interceptors. Site investigation and testing for percolation proprieties and groundwater. Source control techniques in SuDS. Dry swale, wet swale, grass channels. Swale design examples. Filter drains, fin drains, over the edge drainage.  Bio-retention basins, permeable pavements. Site control in SuDS, attenuation ponds, detention ponds, in line and off line infiltration basins, geo-cellular attenuation systems, attenuation tanks. Wetlands, linear wetlands,  retention times in constructed wetlands. Hybrid ponds. Accidental spill and its analyses in SuDS systems. Flow control methods, orifice flow, Venturi flume, weirs, vortex flow control. SuDS case study. 


4.Flood Study Report, Flood Estimation Handbook, IH 124, Introduction to the Flood Study Update (FSU),  Depth Duration Frequency Rainfall Models, Physical Catchment Descriptors (PCDS), Estimation of Q(med) and Q(medrural), gauged and un-gauged catchments, pivotal sites v's subject sites, Euclidean Pooling, Geographical Pooling, Growth Curve Prediction, Generalised Extreme Value (GEV), Log-normal Distribution , Generalised Logistical Distribution, Gumble Extreme Value Distribution. Hydrograph analyses and development for gauged and un-gauged catchments.  Interactive Bridge Invoking and Design Event Method (IBIDEM).

5.The development of flood policy in Ireland. Flood risk appraisal, Catchment Flood Risk Assessment and Management (CFRAMS), preliminary flood risk assessment maps, AFA flood hazard maps, Flood Risk Management Plans (FRMP's), National Flood Database. The planning system and flood risk management. The sequential approach and justification test. The definition of flood zones. Pluvial, fluvial, coastal, and groundwater  flooding. Highly vulnerable, less vulnerable and water compatible developments. Strategic Flood Risk Assessments (SFRA) and local authorities. Site Specific Flood Risk Assessment (SSFRA). SSFRA Screening and scoping process.  Mitigation measures and flood protection. Climate change prediction , definition of Mid Range Future Scenario (MRFS) and High End Future Scenario Events (HEFS).  

6.Irish Coastal Protection Strategy Study (ICPSS). Identification of coastal risks, coastal erosions, wave overtopping, tidal flooding. Prediction of extreme tidal events, coastal mapping. Tidal gauge network. Development of and accuracy of erosion and flood prediction mapping. Irish Sea Tidal and Coastal Surge Model (ISTCSM). Coastal protection techniques.

7. Hydraulic modelling techniques. 1-Dimensional Hydraulic Modelling, limitation of 1-D hydraulic modelling. 2-Dimensional hydraulic modelling, examples of 2-D hydraulic models, Light  Detection and Imaging Radar (LiDAR), Digital Terrain Models (DTM), Digital Surface Models (DSM),  linked 1-D and 2-D hydraulic models. The limitation of 2-D hydraulic modelling. 3-Dimensional hydraulic models and their applications. 

8.The Office of Public Works and its role in flood prevention. Section 50 applications, definition of hydraulic characteristics under section 50 applications. Hydraulic design requirements and level of technical analysis required under section 50 applications.  Efficient and inefficient elements in the hydraulic design of bridges and culverts. Worked examples on section 50 applications.




Coursework & Assessment Breakdown

Coursework & Continuous Assessment
50 %
End of Semester / Year Formal Exam
50 %

Coursework Assessment

Title Type Form Percent Week Learning Outcomes Assessed
1 Hydraulic Modelling of River Channel Project Assignment 20 % OnGoing 2,5,7
2 Design of sustainable drainage system Project Individual Project 30 % End of Semester 1,2,6

End of Semester / Year Assessment

Title Type Form Percent Week Learning Outcomes Assessed
1 Drainage Systems Exam Final Exam Closed Book Exam 50 % End of Semester 1,2,3,4,5

Online Learning Mode Workload

Type Location Description Hours Frequency Avg Workload
Lecture Not Specified Lecture 2 Weekly 2.00
Tutorial Not Specified Tutorial 1 Weekly 1.00
Workshop Not Specified Workshops 2.5 Twice Per Semester 0.33
Independent Learning Not Specified Self directed learning 6 Weekly 6.00
Total Online Learning Average Weekly Learner Contact Time 3.33 Hours

Required & Recommended Book List

Recommended Reading
2011-05-01 Understanding Hydraulics Palgrave MacMillan
ISBN 0230242758 ISBN-13 9780230242753

Covering all the fundamental topics in hydraulics and hydrology, this text is essential reading for undergraduate students and practising engineers around the world who want an accessible, thorough and trusted introduction to the subject. By encouraging readers to work through examples, try simple experiments and continually test their own understanding as the book progresses, the text quickly builds confidence. This hands-on approach aims to show students just how interesting hydraulics and hydrology are, as well as providing an invaluable reference resource for practising engineers. Key features: * an easy-to-read, engaging text * a wealth of worked examples to reinforce the theory * boxed highlights and Remember! features * Self Test and Revision Questions with solutions * a wide range of figures and photographs This third edition includes: * Updates on climate change, flood risk management, flood alleviation, design considerations when developing greenfield sites, and the design of storm water sewers * A new chapter on sustainable storm water management

Recommended Reading
2008-01-01 Pressure Transients in Water Engineering: A Guide to Analysis and Interpretation of Behaviour Thomas Telford Publishing
ISBN 0727735926 ISBN-13 9780727735928

This practical book provides an indepth analysis of actual systems, with emphasis on the type of hydraulic transient behaviour to be expected in each kind of configuration. Mathematical treatment is covered in a straightforward manner without the need to rely on advanced mathematical skills. Thus, the descriptive nature of this book allows the reader to understand behaviour without constant reference to equations.

Recommended Reading
2014-05-30 Hydraulics for Civil Engineers (ICE Textbook series) ICE Publishing
ISBN 0727758454 ISBN-13 9780727758453

ICE Textbooks provide clear, accurate and relevant information on the major principles of civil and structural engineering at a level suitable for undergraduate students worldwide. Divided into easily understandable modules, ICE Textbooks feature worked examples, practice questions and learning point summaries throughout. Hydraulics for Civil Engineers provides a fundamental introduction to the area of fluid mechanics and hydraulics. This book covers all key areas of learning including such subjects as hydrostatics; hydrodynamics; turbines and pumps; flow and waves.

Module Resources

Non ISBN Literary Resources

Links on Moodle page to all relevant codes of practice and journals.


Journal Resources

Links on Moodle page to all relevant codes of practice and journals.

URL Resources

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Other Resources

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Additional Information