half-day intensive seminar entitled: how to design a drainage system to meet the requirements of the...
TRANSCRIPT
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Half-Day Intensive Seminar Entitled: How to Design a Drainage System to Meet the Requirements of the Urban
Stormwater Management Manual (MSMA) by D.I.D.
Presenter: Ir. Dr. Quek Keng HongOrganised By: Water Resources Technical Division (WRTD) of IEM
Date: 13-4-2009 (Monday) Time: 9:00 am-1:00 pm
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Timetable for the Seminar…
• Registration: 8:30 am- 9:00 am• Session 1: 9:00 am-10:45 am• Tea Break: 10:45 am-11:15 am• Session 2: 11:15 am-12:45 pm• Q & A: 12:45 noon- 1:00 pm
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Topics to be Covered
• Part A- What is MSMA?• Part B- What’s new in MSMA?• Part C- How to master MSMA?• Part D- How to solve problems in MSMA?• Part E- Where to download free resources in
MSMA?
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Introducing Myself…
• Ir. Dr. Quek Keng Hong
• Chairman of WRTD, IEM 2003/4/5
• Professional engineer, member IEM
• Consultancy for 20+ years
• Training 8 MSMA Workshops + Courses
• Principal of Dr. Quek & Associates
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My Track Records: • Review of Bridges for Double Track from Rawang-
Ipoh- 2001. DRB-HICOM.• Review of Culverts for Double Track from Rawang-
Ipoh- 2001. DRB-HICOM.• Hydrological and Hydraulic Design Double Track
from Gemas-Kluang 2003/4. GAMUDA-MMC.• Hydrological and Hydraulic Design Double Track
from Kluang-JB- 2003/4. GAMUDA-MMC.• Many infrastructural projects around the country.• Expert witness for several court cases related to
flooding.
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Seminar Guide:
• You can download Free MSMA Resources:
• eCourse at: http://ecourse.msmam.com
• Videos at: http://videos.msmam.com
• Software: http://software.msmam.com
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The Right Approach
• How to master MSMA?
• Knowledge
• Tools
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Knowledge
• What knowledge?
• Technical knowledge
• Software skill
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Tools
• What tools?
• Manual
• Software
• Other References
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Technical Knowledge
• What technical knowledge?
• Requirements
• Computation
• Design
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Technical Knowledge
• What technical knowledge?
• Simplify the problem
• Break it down
• Solve individually
• Combined them
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Design Storm
Calculate IDF data
Hydrograph Method
Time Area Method orRunoff Routing Method
Reservoir Routing
Level Pool Routing Through Detention Storage
Calculate Water Level(Workshop 2)
Use HEC-RAS model to calculate water level in drain
Qp
t
I
t
Detention Basin
Open Drain
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Technical Knowledge
• What technical knowledge?
• Simplify the problem- models
• Break it down- 4 models
• Solve individually- 4 procedures
• Combined them- outflow hydrograph
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Technical Knowledge
• Tip: You can refer to the relevant parts of the Manual
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Conclusion
• You will reach your destination safely if you have the right skill and tool.
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Tricks & Shortcuts
• Question: What is the most powerful tool you need to apply MSMA?
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• Cheap
• Save time
• Automation
• Repetitive
• Accurate
• Reporting
Requirements
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Spreadsheet
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Why Spreadsheets?
• Spreadsheets are powerful!– Cheap- free– Save time- recycle– Automation- computation is automatic– Repetitive- iterative work– Accurate- less computation error– Reporting- graphs & tables
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Why Spreadsheets?
• Good for repetitive calculation
• Good for presentation
• Can be applied from job to job
• Easy for checking & record
• Lifetime tool of an engineer
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Spreadsheet vs Proprietary Software
• You understand what you do using spreadsheet (hand calc)
• You know how and where the parameters are used
• Debugging easier- you know what parameters to change
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Conclusion:
• Spreadsheet will make work smarter and not harder.
• More importantly it will make you a better engineer.
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Create your own physical library of tools, resources & software
• Create your own physical library of tools, resources & software recommended in MSMA
• Print out all manuals- bind them
• Read them.
• How I do it?
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This is my Resources on MSMA:
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Part of the physical libraryin my office:
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Create your own digital library of tools, resources & software
• Create your own digital library of tools, resources & software recommended in MSMA
• Save into a PC/notebook computer
• Learn to apply them.
• How I do it?
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PC- digital library:
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Create spreadsheets for all MSMA computation
• Create spreadsheets for all MSMA computation
• Save them and use them for future jobs
• Refine them
• Improve them
• Keep it in your notebook PC
• They ARE your money-making tools!!!
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Why Spreadsheets?
• Spreadsheets are powerful!
• Good for repetitive calculation
• Can plot graph easily
• Ideal for output to report
• Can be applied from job to job
• Example: culverts spreadsheet
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Examples of Spreadsheets:
• Design storm (IFD computation)
• Peak discharge computation (Rational Method, Time-Area Method)
• Reservoir routing (Level Pool Routing)
• Culvert design procedure (inlet & outlet control)
• Plus many more…(continue next page)
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More Spreadsheets…
• HP1- IFD curves • HP4- Regional Flood Frequency Analysis
(rural)• HP 5- Rational Method (rural)• HP 11- Design Hydrograph Method (rural)• HP 16- Modified Rational Method.• Flood frequency analysis using Weibull• Reservoir routing program- (fortran)• And more …. (more added from time to time)
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Download Software Recommended in MSMA
• Download software recommended in MSMA
• Install them
• Print out user manual >>> physical library
• Read them
• Go through worked example
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Examples of Software Recommended in MSMA
• Many software- proprietary & public domain
• MUST HAVE software:– Hydrologic Modelling
• Runoff-Routing Computer Models (HEC-HMS)
– Hydraulic Modelling • HEC-RAS
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Build Your Own Library of Tools
• MSMA recommends many free software & resources.
• Save $1,000 compared to commercial software.
• Download, install, print manual & learn to apply them.
• Your money-making tools!
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Download Software Not Recommended in MSMA
• This is OPTIONAL!• Download software not recommended in
MSMA• Install them• Print out user manual >>> physical
library• Read them • Examples: some water quality model
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Where to Find Good Software
• US Army Corps of Engineers- Hydrologic Engineer Center
• US EPA
• US Geological Survey
• Etc…
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Conclusion:
• There are tonnes of free software, programs/spreadsheet that are available!
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Part A- What is MSMA?
• What is the purpose of MSMA?
• What are major differences between MSMA & PDP1?
• Why the need for MSMA?
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Tip 1- What is the purpose of MSMA?
• New urban drainage design procedures and guidelines for Malaysia…
• “Urban Stormwater Management Manual for Malaysia”
• “Manual Saliran Mesra Alam Malaysia” or MSMA
• Published by DID in 2000• Gazetted by the Federal Government in 2001
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Tip 2- Major Differences Between MSMA & PDP1?
• MSMA• >1,100 pages• 20 volumes• 48 chapters• 2 three-inch arch
folders
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Compared to the Old Procedure…
• PDP1- Planning and Design Procedure No. 1 published by D.I.D. in 1975.
• 242 pages• 10 chapters• ½ inch thick
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Tip 3- Why MSMA?
• Why there is a need to introduce MSMA?
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The Star- KL Hit By Floods!
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KL- A Floating City?
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LRT Becomes LBT?
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The Only Free Parking Lot in KL
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Part B- What’s new in MSMA?
• What are major changes in MSMA?
• Rapid Disposal Vs Control-at-Source
• Major & minor system concept
• Onsite Detention, Community and Regional Detention/Retention
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Tip 4- Some Major Changes:
• Major changes in design approach & procedures
• Emphasis on water quantity and quality management in MSMA.
• More comprehensive coverage of subject matters
• Emphasis on computational methods• MSMA- SI units, PDP1- Imperial units
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Tip 5- Rapid Disposal Vs Control-at-Source
• PDP1- Rapid Disposal
• MSMA- Control-at-Source
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Old Approach- Rapid-Disposal Old Approach- Rapid-Disposal (Conveyance Oriented Approach)(Conveyance Oriented Approach)
W/o erosion and sediment control
Source of pollutionLarge and deep
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New Approach- Control-at-source
Detention Pond Storage Tank Engineered Waterway
Sediment Fence Gross Pollutant Trap
Swale
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Tip 6- Major & Minor Systems Design Concepts
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Tip 7- Detention/Retention Storages Classification: OSD, Community & Regional
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Tip 8- Concept for Multilevel Stormwater System
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Tip 9- Examples of On-site Detention Facilities
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Tip 10- Devices for Community & Regional Detentions
• Involves detention Storage
• Example: detention basins/ponds
• Attenuation of hydrograph
• Pre and post-development peak discharge
• Reduction in peak discharge because of detention control of runoff
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Tip 11- Differences Between OSD & Community Detention:
• MSMA (Control-at-source):– On-site Stormwater Detention (OSD)- Minor
Storm (10 year ARI)– Community or regional detention- Minor &
Major Storms (20, 50, 100 year ARI)
Many water quantity control measures eg, retention, detention and infiltration.Aim: To limit the post-development peak outflow rate to that existed before developmentDesign ARI: Table 4.1.
Many water quantity control measures eg, retention, detention and infiltration.Aim: To limit the post-development peak outflow rate to that existed before developmentDesign ARI: Table 4.1.
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More Differences…• On-site Stormwater Detention (OSD)-
individual housing/industrial lots.
• Community/Regional facilities- catchment consists of mixed landuse/different owners.
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Part C- How to Master MSMA?
• How to learn MSMA?
• How to increase your productivity in applying MSMA?
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Tip 12- How to Learn to Apply MSMA?
• Read the MSMA Manual
• Question: But where to start?
• Answer: Start from Page 1…
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So You Started Reading MSMA…
• Assuming you started reading from Page 1.
• At Page 123, you’re bored.
• At Page 456, you’re confused.
• At Page 789, you finally give up!
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Why Do You Fail?
• Too thick (>1,100 pages)! No time!
• Too complicated! Too much information!
• What is important?• What is not important?• You cannot relate
what you read to your work
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Tip 13- The Correct Way of Learning MSMA…
• Understand what you need to know?
• Read only what you need to know.
• Do the worked examples.
• Repeat the above.Note:
1. Focal point- scatted information in MSMA, Eg detention basin design, reservoir routing, design ARI.
2. Allows you to relate what you read to your work & experience
3. Build upon what you already knew. You are not starting 100% new.
Note:
1. Focal point- scatted information in MSMA, Eg detention basin design, reservoir routing, design ARI.
2. Allows you to relate what you read to your work & experience
3. Build upon what you already knew. You are not starting 100% new.
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So Why Do You Fail Again?
• No focal point- reading disorganised information from Page 1 to 1,100.
• Cannot relate to your work or what you already know.
• You are bored!
• That’s why you failed!
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Tip 14- Secrets for Success…
• Understand what you need to know?
• Focus only on what you need to know.
• Do the worked examples.
• Repeat the above.
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Tip 15- So You Want Some Tips?
• Use Examples (Design Storm, Rational Method, Hydrograph Method, Reservoir Routing etc) as a starting point.
• Read the relevant chapters in MSMA.
• Go through the Worked Examples.
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Tip 16- Create your own physical library of tools, resources & software
• Create your own physical library of tools, resources & software recommended in MSMA
• Print out all manuals- bind them
• Read them.
• How I do it?
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This is my Resources on MSMA:
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Part of the physical libraryin my office:
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Tip 17- Create your own digital library of tools, resources & software
• Create your own digital library of tools, resources & software recommended in MSMA
• Save into a PC/notebook computer
• Learn to apply them.
• How I do it?
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PC- digital library:
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Tip 18- Create spreadsheets for all MSMA computation
• Create spreadsheets for all MSMA computation
• Save them and use them for future jobs
• Refine them
• Improve them
• Keep it in your notebook PC
• They ARE your money-making tools!!!
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Why Spreadsheets?
• Spreadsheets are powerful!
• Good for repetitive calculation
• Can plot graph easily
• Ideal for output to report
• Can be applied from job to job
• Example: culverts spreadsheet
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Tip 19- Examples of Spreadsheets:
• Design storm (IFD computation)
• Peak discharge computation (Rational Method, Time-Area Method)
• Reservoir routing (Level Pool Routing)
• Culvert design procedure (inlet & outlet control)
• Plus many more…(continue next page)
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More Spreadsheets…
• HP1- IFD curves • HP4- Regional Flood Frequency Analysis
(rural)• HP 5- Rational Method (rural)• HP 11- Design Hydrograph Method (rural)• HP 16- Modified Rational Method.• Flood frequency analysis using Weibull• Reservoir routing program- (fortran)• And more …. (more added from time to time)
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Tip 20- Download Software Recommended in MSMA
• Download software recommended in MSMA
• Install them
• Print out user manual >>> physical library
• Read them
• Go through worked example
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Tip 21- Examples of Software Recommended in MSMA
• Many software- proprietary & public domain
• MUST HAVE software:– Hydrologic Modelling
• Runoff-Routing Computer Models (HEC-HMS)
– Hydraulic Modelling • HEC-RAS
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Tip 22- Build Your Own Library of Tools
• MSMA recommends many free software & resources.
• Save $1,000 compared to commercial software.
• Download, install, print manual & learn to apply them.
• Your money-making tools!
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Tip 23- Download Software Not Recommended in MSMA
• This is OPTIONAL!• Download software not recommended in
MSMA• Install them• Print out user manual >>> physical
library• Read them • Examples: some water quality model
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Tip 24- Where to Find Good Software
• US Army Corps of Engineers- Hydrologic Engineer Center
• US EPA
• US Geological Survey
• Etc…
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Part D- How to solve problems in MSMA?
• Question: What is the most powerful tool you need to apply MSMAM?
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• Cheap
• Save time
• Automation
• Repetitive
• Accurate
• Reporting
Qualities of the Tool
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Spreadsheet
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Why Spreadsheets?
• Spreadsheets are powerful!– Cheap- free– Save time- recycle– Automation- computation is automatic– Repetitive- iterative work– Accurate- less computation error– Reporting- graphs & tables
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Why Spreadsheets?
• Good for repetitive calculation
• Good for presentation
• Can be applied from job to job
• Easy for checking & record
• Lifetime tool of an engineer
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Spreadsheet vs Proprietary Software
• You understand what you do using spreadsheet (hand calc)
• You know how and where the parameters are used
• Debugging easier- you know what parameters to change
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Tip 25- Examples of Computational Procedure
1. Computation of design storm2. Computation of peak discharge3. Reservoir routing4. Design of detention basin5. Design of sediment basin6. Culvert design procedure7. Hydrologic modelling8. Hydraulic modelling
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Tip 26- Example 1: Computation of Design Storms
• MSMA uses a set of polynomial equations for 35 major urban centres in Malaysia.
• PDP1 uses:– IFD curves derived for 11 cities in P. Malaysia– HP1 uses a set of ½, 2 & 24 hour isopleths of 2
and 20 year A.R.I. for Malaysia.
Note:
MSMA data up to 2000, PDP1 data up to 1982
Note:
MSMA data up to 2000, PDP1 data up to 1982
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Tip 27- Example 2: Computation of Peak Discharge
• MSMA uses:– For area < 0.8 km2, Rational Method.– For area > 0.8 km2,
• Time-Area Method
• Runoff-Routing Computer Models
• PDP1 uses:– Modified Rational Method
Note:
0.8 km2= 80 ha= 198 acres
HEC-HMS, RORB, RAFTS, SWMM
Note:
0.8 km2= 80 ha= 198 acres
HEC-HMS, RORB, RAFTS, SWMM
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Tip 28- Other D.I.D. Procedures…
• Summary of empirical methods: – HP5 (DID, 1989)- Rational Method– HP11 (DID, 1980)- Design Hydrograph Method– PDP1 (DID, 1975) & (HP16, 1976)- Modified
Rational Method– HP4 (1987) Regional Flood Frequency Analysis– MSMA (DID, 2000)
• All these are still valid (except PDP1)• Can be used instead of MSMA.
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Range of Validity:
Tea Break
Be Back at 11:00 am
Tea Break
Be Back at 11:00 am
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Tip 29- Example 3: Reservoir Routing
• MSMA uses level-pool routing method.
• PDP1 uses a graphical procedure to determine the maximum differential storage based on the cumulative inflow and outflow.
Note:
MSMA more accurate
PDP1 approximate
Note:
MSMA more accurate
PDP1 approximate
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Tip 30- Example 4: Design of Detention Basin
• MSMA uses:– Hydrograph method for inflow– Level-pool routing through basin– Can route inflow hydrograph through basin to get outflow
hydrograph
• PDP1 uses:– Modified Rational Method for inflow– Graphical method of determining storage– Cannot route hydrograph through basin
• MSMA states that Post-Development Peak = Pre-Development Peak for major & minor storms
Note:
MSMA computes outflow hydrograph from detention basin
Note:
MSMA computes outflow hydrograph from detention basin
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Tip 31- Example 5: Design of Sediment Basin
• MSMA uses:– 3 or 6 month A.R.I for design storm < or > 2 yr– Wet/dry sediment basin– Storage volume related to storm charateristics
(Time of concentration and storm depth)
• PDP1 uses:– empirical formula to determine storage volume
Note:
MSMA- more rational
PDP1- more empirical
Note:
MSMA- more rational
PDP1- more empirical
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Tip 32- Example 6: Culvert Design Procedure
• MSMA uses: – SI units– Different nomographs– More entrance loss coefficients (outlet control)
• PDP1 uses:– Imperial units– Different nomographs– Less entrance loss coefficients
Note:
MSMA culvert formula wrong!
Eqn 27.4, 27.5
Note:
MSMA culvert formula wrong!
Eqn 27.4, 27.5
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Tip 33- Example 7: Hydrologic Modelling
• MSMA: – Hydrologic Modelling
• Runoff-Routing Computer Models (HEC-HMS)
PDP1: – Not specified (1975)
HEC: Excellent free public domain software.
HEC: Excellent free public domain software.
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HEC-HMS Theory:• Hydrological software: HEC-HMS 2.1.1
– Compute discharge peak & hydrograph for design (urban & rural catchment any size)
• Separate submodels to represent different components of the rainfall and runoff process:– Models of runoff volume (Loss Models)
– Models of direct runoff (Transform Models)
– Models of baseflow (Baseflow Models)
– Models of channel flow (Routing Models)
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HEC-HMS Representation of the Runoff Process:
Important:
Chose the submodels carefully.
Not all valid in Malaysia.
Submodel must be rational.
Important:
Chose the submodels carefully.
Not all valid in Malaysia.
Submodel must be rational.
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Schematic Layout of HEC-HMS Model :
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HEC-HMS Application:• HEC-HMS• Input:
– Topographic map– Rainfall hyetograph– Streamflow hydrograph
• Output:– Discharge hydrographs
• Quick worked example follows…
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Tip 34- Example 8: Hydraulic Computation
• MSMA: – Recommends the use of HEC-RAS
– Steady state one dimensional open channel hydraulics.
• PDP1: – Unclear on this
– Backwater profile computation using standard step method considered too difficult
– Manning Formula
Note:
HEC-RAS: Solution of energy equation.
Excellent free public domain software.
Note:
HEC-RAS: Solution of energy equation.
Excellent free public domain software.
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Tip 35- Hydraulic Modelling:
• Hydraulic software: HEC-RAS 3.1– Compute backwater surface profile, simulate
culverts, drains, weirs & overbank flow.– By solving the energy equation with an
iterative procedure called the standard step method.
• PDP1- Backwater profile computation using standard step method considered too difficult, use Manning Formula
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Representation of Terms in Energy Equation:
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HEC-RAS Application:• HEC-RAS• Input:
– Channel cross sectional data– Roughness– Inflow
• Output:– Water level
• Quick worked example follows…
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Tip 36- Where to Get Them For Free?
• High quality software by US Army Corps of Engineers
• Powerful, user friendly.
• FREE
• Download, print manual, learn to use them
• Your tools- put in your library collection
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Part E- Where to download free resources?
• You can download Free MSMA Resources:
• eCourse at: http://ecourse.msmam.com
• Videos at: http://videos.msmam.com
• Software: http://software.msmam.com
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Tip 37- FREE e-Course… • Free eCourse for all participants of
this seminar.
• It covers all the topics discussed today.
• Simply fill in the pop-up request form at:http://MSMAM.com
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Tip 38- Free Demo Spreadsheets:
• Simply fill-up the request form to download FREE demo spreadsheets discussed during this Seminar at:
http://msmam.com
See live demo!
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Examples of Spreadsheets:
• Design storm (IFD computation)
• Peak discharge computation (Rational Method, Time-Area Method)
• Reservoir routing (Level Pool Routing)
• Culvert design procedure (inlet & outlet control)
• Plus many more…(continue next page)
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More Spreadsheets…
• HP1- IFD curves • HP4- Regional Flood Frequency Analysis
(rural)• HP 5- Rational Method (rural)• HP 11- Design Hydrograph Method (rural)• HP 16- Modified Rational Method.• Flood frequency analysis using Weibull• Reservoir routing program- (fortran)• And more …. (more added from time to time)
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Topics Covered- Recap• Part A- What is MSMA?
• Part B- What’s new in MSMA?
• Part C- How to master MSMA?
• Part D- How to solve problems in MSMA?
• Part E- Where to download free resources in MSMA?
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Announcing June 2009 Workshop • How to Successfully Design a Drainage System
for Compliance with the New Urban Stormwater Management Manual by D.I.D.
• Workshop No. 1- Introductory Concepts, design criteria & procedure
• Workshop No. 2- How to design drainage system using free software
• Workshop No. 3- How to design detention/sediment basin & culverts
• Workshop No. 4- Erosion and Sediment Control Plan (ESCP) and On-Site Detention (OSD)
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Contact Details:
Any queries?
You are welcome to contact me.
Details of email & phone number at:
http://www.msmam.com
Thank you!Thank you!
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Some Errata in MSMA:
• Peak discharge computation – Rational Method Eqn 14.1 – Time-Area Method Work Example App 14.B.2
• Reservoir routing – Level Pool Routing- Work Example App 20.B
• Culvert design procedure – inlet & outlet control- Eqn 27.4 & 27.5
• Appendix 39.A
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And I Wish You…
GOOD LUCK!