L32– Urban Drainage System

  M odu le 8 – ( L3 1 – L3 4 ) : “St or m W a t e r & Flood M a n a ge m e n t l d ”: ”

  

St or m w a t e r m a n a ge m e n t , de sign of dr a in a ge syst e m , flood

r ou t in g t h r ou gh ch a n n e ls a n d r e se r voir , flood con t r ol a n d r ou t in g t h r ou gh ch a n n e ls a n d r e se r voir flood con t r ol a n d r e se r voir ope r a t ion , ca se st u die s. Ur ba n D r a in a ge Syst e m 3 2 3 2 ₁

  L32 L32– L32 L32 Ur ba n D r a in a ge Syst e m Ur ba n D r a in a ge Syst e m  

  Topics Cove r e d Topics Cove r e d  

  Urban flooding, disast er risk Urban flooding, disast er risk m anagem ent , Urban drainage syst em , m anagem ent , Urban drainage syst em , design requirem ent s, Roadside design requirem ent s, Roadside design requirem ent s Roadside design requirem ent s Roadside drainage design drainage design

  

  Urban flooding, drainage syst em Urban flooding, drainage syst em

Keywords: Keywords:

  des g , design, risk m anagem ent , roadside drain. design, risk m anagem ent , roadside drain. des g , s s a age a age e t , oads de d a e t , oads de d a

  

Prof. T I Eldho, Department of Civil Engineering, IIT Bombay Causes of Urban Flooding Causes of Urban Flooding 

  Why urban flooding?. –

• – large increase in concret e/ im pervious large increase in concret e/ im pervious surface?.
• – Unplanned usage of urban land?. – Unplanned usage of urban land? – Lack of proper drainage?.

  Mum bai on Jul 26 27 05 Mum bai on Jul 26, 27, 05

• – Loss of wet lands?. Loss of wet lands? – Less groundwat er usage / recharge?.
• – Tidal effect s?. Tidal effect s? – Very heavy st orm s – cloud burst ?.

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  

Urban Flood Disast er Risk Managem ent Urban Flood Disast er Risk Managem ent



  Developing appropriat e coping st rat egies & disast er risk reduct ion plans reduct ion plans , along wit h great er awareness of how t o , along wit h great er awareness of how t o

  reduce risks, is t he high priorit y agenda

   St rat egies: Enhancing nat ional, st at e and local scale

  advocacy part nerships and knowledge m anagem ent advocacy part nerships and knowledge m anagem ent

  

  St andardizing hazard risk m anagem ent t ools, m et hodologies and pract ices

  

  Developing int egrat ed and coordinat ed approaches

  

  I ncorporat ing ‘Learning by Doing’ m ode of operat ions

  

  P Prom ot ing t he diffusion/ docum ent at ion of best pract ices i h diff i / d i f b i

  

  Building appropriat e com m unicat ion prot ocols facilit at ing m ult i- plat form and m ult i- lingual dissem inat ion u p a o a d u gua d sse a o

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  

Urban Flood Disast er Risk Managem ent Urban Flood Disast er Risk Managem ent



  Analyzing & present ing inform at ion in an easily underst andable form , for wider use by decision m akers, underst andable form , for wider use by decision m akers,

  

  Encouraging int egrat ed approaches of proj ect im plem ent at ion based on Mast er Plan,

  

  Encouraging st at es t o accord t op priorit y t o deal w it h d d l h recurring urban flooding

   Urban flood m anagem ent Urban flood m anagem ent – difficult ies difficult ies

  

  Com prehensive risk assessm ent , Fact oring risks in developm ent planning, Coordinat ion am ong different inst it ut ions, Lack of inform at ion sharing, Disint egrat ed inst it ut ions Lack of inform at ion sharing Disint egrat ed invest m ent decisions, Lack of consult at ion wit h st akeholders et c.

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  

Wat ershed Based -- Urban Flood Managem ent Wat ershed Based Urban Flood Managem ent



  A Any planning for effect ive urban flood m anagem ent has l i f ff i b fl d h t o t ake int o t he considerat ion of ent ire wat ershed.

  

  I dent ify problem s, causes & rem ediat ion de y p ob e s, causes & e ed a o

  

  Preparedness and m it igat ion,

  

  Early warning and com m unicat ion,

  

  Response,

  

  Awareness generat ion,

   

  Com m unit y capacit y developm ent . Com m unit y capacit y developm ent

  

  Vulnerabilit y & risk assessm ent – reduce vulnerabilit y

  

  Hazard m apping: flood level m apping, ident ify dam ages, pp g pp

  g, y g , insurance & risk t ransfer

   Spat ial Decision Support Syst em

   Urban I nform at ion Syst em U b I f t i S t

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Ur ba n D r a in a ge Syst e m  Drainage syst em s cat egorized as m aj or & m inor syst em s. 

  Maj or drainage syst em - com prises of open nallahs/ and nat ural surface drains, et c. t l f d i t

   Minor syst em - net work of underground pipes & channels.  

  Minor syst em cat egorized int o t wo t ypes: separat e & Minor syst em cat egorized int o t wo t ypes: separat e & com bined.

  

  Separat e drainage syst em s consist of t wo conveyance net w orks: sanit ary sew ers ( usually underground pipes) net o ks sanit a se e s ( s all nde g o nd pipes) conveying wast ewat er from hom es & businesses t o a discharge point , while t he st orm drains ( underground pipes or channels) collect wat er from t he rainfall runoff and convey it t o a discharge point

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Ur ba n D r a in a ge -- Pr oce sse s Ur ba n D r a in a ge Pr oce sse s ( M a r k e t a l., 2 0 0 4 ) ( M k t l 2 0 0 4 ) Pr e cipit a t ion W a t e r sh e d Ur ba n - I m p.

  M o- – r a in / sn ow – r a in / sn ow a r e a a r e a a r e a a r e a de l de l H yd- r ol- Ove r la n d flow - ogy ogy

H ydr ogr a ph

  R o a D e pt h of p Roa d oa d d d flow / Roa d St or a ge / fl disch a r ge / r ou t in g M o- o floodin g de l w w H y- Pi Roa d side Roa d side dr - a ppu r t e n a n ce s a ppu r t e n a n ce s p a u - e D e pt h of D t h f lics fl D r a in - D r a in flow flow / ch a n n e l/ o r ou t in g disch a r ge pipe

  St or m w a t e r D r a in a ge Syst e m

  Tot al st orm wat er syst em – m aj or & m inor invent ory of t he syst em for bet t er m anagem ent – GI S plat form . y g p 

• – 

  

I nvent ory w ill be bot h w at ershed based t o enable proper

hydrologic & hydraulic analysis & w ard based t o enable coordinat ed adm inist rat ive m anagem ent g

   Minor syst em s should be m apped clearly show ing t he int erconnect ions w it h m aj or syst em besides t he cross co connect ions w it h sew er lines ect o s t se e es

   Maj or syst em s - be m apped clearly w it h delineat ion, dem arcat ion & det ails of cross- sect ions, slopes, drain crossings including nat ural form at ions & m an m ade crossings including nat ural form at ions & m an m ade st ruct ures

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Ur ba n D r a in a ge D e sign - Re qu ir e m e n t s 

  Developm ent of an adequat e & funct ioning drainage syst em based on sound hydrologic & hydraulic design syst em based on sound hydrologic & hydraulic design principles.

  

  Design of an urban drainage syst em requires knowledge of t he cat chm ent area and t opography, knowledge of t he cat chm ent area and t opography urbanizat ion det ails, rainfall int ensit y, hydrology, hydraulics, et c.

   Wat ershed/ Cat chm ent as basis of urban drainage

  design

    Cont ours Cont ours are necessary for det erm ining t he are necessary for det erm ining t he

  boundaries of a wat ershed/ cat chm ent & for com put ing direct ions of flow.

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Ur ba n D r a in a ge D e sign - Re qu ir e m e n t s 

  Rainfall dat a: For design of a drainage syst em , t he convent ional pract ice is t o choose an appropriat e, p pp p st at ist ically relevant design st orm t o est ablish t he st orm w at er flow s t o be conveyed, based on exist ing nat ional & int ernat ional pract ices.

   Design st orm s can be est im at ed from rainfall dat a records w here available.

   Up t o dat e

  I DF ( I nt ensit y Durat ion Frequency) relat ionships Up t o dat e ( t e s t y u at o eque cy) e at o s ps need t o be used t o m aint ain design st andards for new syst em s & ret rofit t ing/ replacem ent of old urban drainage syst em s. y

  

  I DF curves should be developed for each cit y, based on ext ract ion of dat a from t he raw dat a chart s at m in. 15- m inut es resolut ion ^{1 0 0 H y t o g r a p h o f K a l a m b o l i r a i n f a l l}

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay _{R 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4} ^{2 0 4 0 6 0 8 0 a i n f a l ︵ l m m / h r︶} _{T i m e s t a r t i n g f r o m 1 2 h r h r}

  Ur ba n D r a in a ge D e sign Con side r a t ion s 

  Frequency of t hunderst orm s - addit ional considerat ion for planning fut ure urban drainage syst em s. for planning fut ure urban drainage syst em s.

   Design flow: To prot ect urban areas, safe

  m anagem ent & passage of wat er, result ing from frequent st orm event s ( hydrologic design aspect s) & frequent st orm event s ( hydrologic design aspect s) & adequat e capacit y ( hydraulic design aspect s) m ust be considered.

   Urban Drainage Design: m ain obj ect ives of hydrologic

  analysis & design are t o est im at e peak flow rat es &/ or flow hydrographs for t he adequat e sizing & design of flow hydrographs for t he adequat e sizing & design of conveyance & quant it y cont rol facilit ies

  

  To est im at e peak flow rat es , knowledge of t he rainfall int ensit y it s durat ion & frequency is required ^{H y t o g r a p h o f K a l a m b o l i r a i n f a l l} int ensit y, it s durat ion & frequency is required

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay _{R 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4} ^{2 0 4 0 6 0 8 0 1 0 0 y g p} _a ^{i n f a l ︵ l m m / h r︶} _{T i m e s t a r t i n g f r o m 1 2 h r h r}

  Ur ba n D r a in a ge D e sign - Pr oble m s 

  I ncreasing rainfall int ensit ies induced by clim at e

  change, urban heat islands and ot her fact ors, will ibl lt i i t i d f i possibly result in varying ret urn periods for a given int ensit y of rainfall.

   Rainfall int ensit y t o be used for design will also y g depend on t he t im e of concent rat ion .

  

  Higher t he cat chm ent area , higher will be t he t im e of concent rat ion & lower will be t he design rainfall concent rat ion & lower will be t he design rainfall int ensit y, ot her fact ors rem aining t he sam e.

   Peak flow rat es can be est im at ed using Rat ional Met hod Q = C I A .

  

  Approxim at ions based on run- off coefficient , rainfall int ensit y & area of cat chm ent . ^{H y t o g r a p h o f K a l a m b o l i r a i n f a l l} int ensit y & area of cat chm ent .

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay _{R 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4} ^{2 0 4 0 6 0 8 0 1 0 0 y g p} _a ^{i n f a l ︵ l m m / h r︶} _{T i m e s t a r t i n g f r o m 1 2 h r h r}

  D e sign Con side r a t ion s 

  Sim ple channel design: Manning’s equat ion:

  2/ 3 1/ 2

  Q = AR S / n

  

  F For com put at ion of w at er level profiles in t he drainage t t i f t l l fil i t h d i syst em s or channels/ rivers, suit able soft ware for flood

  rout ing should be used.

  

  Public dom ain soft ware - HEC- HMS for hydrologic m odelling of t he wat ershed, HEC- RAS for river m odeling, SWMM ( St orm wat er Managem ent Model) m odeling, SWMM ( St orm wat er Managem ent Model) for sewer/ drainage design

  

  All fut ure st orm wat er drainage syst em s m ay be designed t aking int o considerat ion a runoff coefficient designed t aking int o considerat ion a runoff coefficient of upt o C = 0.95 for est im at ing peak discharge using t he rat ional m et hod

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  

UD S – Ope r a t ion & M a in t e n a n ce



  Proper operat ions and m aint enance ( O&M) are crucial

  for any syst em t o be funct ional t o t he designed for any syst em t o be funct ional t o t he designed capacit y & for it s durabilit y as well.

   Pre- m onsoon desilt ing - a m aj or O&M act ivit y. 

  Periodicit y of cleaning of drains should be worked out , d f l f d h ld b k d based on t he local condit ions.

  

  Rem oval solid wast e: Suit able int ervent ions in t he Rem oval solid wast e: Suit able int ervent ions in t he drainage syst em like t raps, t rash racks can reduce t he am ount of solid wast e going int o t he st orm sewers

  

  Rem oval of sedim ent Rem oval of sedim ent

  

  Drain inlet connect ivit y

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  UD S – Spe cia l Con side r a t ion s 

  Low- lying areas should be reserved for parks and ot her low im pact hum an act ivit ies, ot her low - im pact hum an act ivit ies,

  

  Wherever unavoidable, buildings in low lying areas should be const ruct ed on st ilt s above t he High Flood Level ( HFL) / Full Tank Level ( FTL) Level ( HFL) / Full Tank Level ( FTL)

  

  For chronic flooding spot s, alt ernat e locat ions m ay be explored for accom m odat ing people st aying t here

  

  Buildings should be const ruct ed on st ilt s aft er t aking int o account t he st abilit y of slopes, and

  

  St orm wat er drainage syst em s for coast al cit ies have St orm wat er drainage syst em s for coast al cit ies have t o be designed t aking int o account t he t idal variat ions.

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Roa d Side D r a in a ge 

  Road side drain: I nt egral part of urban drainage syst em g y

  St or m D r a in a ge

• – 

  Collect st orm wat er runoff

• – Away from st ruct ures

  

  Through roadway and/ w at erw ay w at erw ay

  

  Right - of- way

   Obj ect ives

• – Appropriat e design – Hydrologic & hydraulic considerat ions
• – Minim ize t he flooding and erosion t o propert ies – Minim ize t he flooding and erosion t o propert ies
• – Safe t raffic

  8 n ig s e D – e g a

  _{1 1} ⁸

  Civil Engineering, IIT Bombay in a r D e

  Roa d Side D r a in a ge – D e sign St e ps Design Problem and design crit eria specificat ion

•  

  Type, specific localit y Type specific localit y

  Syst em drainage area definit ion and prelim inary – layout 

  St reet layout , t ot al drainage area t o be handled

  Field and office dat a collect ion – 

  Make field visit , sit e specific problem s ( no widt h, Make field visit sit e specific problem s ( no widt h t rees, out crops, ut ilit y locat ions, et c.

  Syst em layout – 

  Final layout , all dit ches, wat erways, inlet s, m anholes, m ains, lat erals, culvert s, flow direct ion, et c. et c

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Roa d Side D r a in a ge – D e sign St e ps g g p Hydrologic calculat ions –

  

  Flow est im at ion for t he designed frequency

• – St reet flow

  

  Flow and spread calculat ions, m axim um spread, gut t ers flow gut t ers flow

  I nlet spacing and layout – 

  Locat ion and t ype of inlet , size, ext ra inlet , et c. yp , , ,

  Hydraulic calculat ions – 

  Size of t he drain, perm issible velocit y, slopes, et c. t

  Various design checks –  

  Discharge, Froude num ber, velocit y, slope Discharge, Froude num ber, velocit y, slope

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay Drainage Design Drainage Design -- Fact ors Fact ors

• – Ret urn period of flood ( rainfall)
• – Spread – I nlet t ypes and spacing
• – Longit udinal slope; Cross slope
• – Curb and gut t er sect ion
• – Roadside and m edian channels
• – Bridge decks / fly over id d k / fl
• – Shoulder gut t er
• – Median barriers Median barriers

  w w w.greenhighwayspart nership.org

• – St orm drains
• – Det ent ion st orage; Erosion – Det ent ion st orage; Erosion – Cost

I m port ant Design Considerat ions I m port ant Design Considerat ions 1.

  How m uch area should be considered for a reach? Act ual lengt h is in- bet ween hydrologic m ount t o

• draining point _{mount mount}

  nallah ^nallah

  2. How m uch widt h should be considered on ot her side of

  t he road drainage?

  I nt ernat ionally road side drain are designed t o cat er I nt ernat ionally road side drain are designed t o cat er “ only road run- off” , but in highly populat ed area it m ay be designed t o carry run- off from near- by area also I m port ant Design Considerat ions I m port ant Design Considerat ions

• Act ual widt h should be based on t opographical survey
• The roads in Mum bai are very peculiar
• The act ual area cont ribut ing t o road side drain is not know n

3) Designed rainfall int ensit y? 3) Designed rainfall int ensit y?

• Generally rainfall int ensit y wit h 10 year ret urn period
• For im port ant roads it should be 50 year ret urn period
• I t should be based on t im e of concent rat ion, I DF curves
• I RC ecom m ends tim e of concent at ion as
• I RC recom m ends t im e of concentrat ion as:

  m ade

  m ade of t w o t im e periods:

  1.Tim e required for t he rain wat er t o flow over t he road surface and ent er int o t he drain ( T1) ; 2. Tim e of flow in drains ( T2)

  4

  _{2 2} ⁴

  2 Drai nin g Nall Nall ah T +

  1 T = n T2 o ti a tr n e c n

T1 T1

  o c

  I m port ant Design Considerat ions I m port ant Design Considerat ions 

  As per I RC 50: For Mum bai

  Type of surface Range

  t he crit ical int ensit y of

  of C

  rainfall is 50 m m / hr rainfall is 50 m m / hr

   Bituminous and cement 0.8- 0.9

  The values are worked out

  concrete pavement

  assum ing

• – Tim e of concent rat ion of f f Gravel and WBM pavement 0.35-

  0.70

  30 m int s

• – Rat e of rainfall is 62.5 Rat e of rainfall is 62.5

  I mpervious soil I mpervious soil 0.40 0.40-

  0.65

  m m / hr ( ret urn period 2 years)

  Soil covered with turf 0.30-

4) Average runoff 4) Average runoff

  0.55 0 55 coefficient ( C) of 0.6

  Pervious soil 0.05-

  0.30 I m port ant Design Considerat ions I m port ant Design Considerat ions 5) Manning’s Coefficient value?

  Su r fa ce Ch a r a ct e r ist i Ra n ge of n value?

• For concret e channels it is 0.013 t o 0.017

  ) bl l Ch a r a ct e r ist i cs n

  Concret e: )

  Form ed no 0 013 t o 6) Perm issible velocit y in t he drains?

  a) Form ed, no finish b)

  Trowel finish 0.013 t o 0.017 0.011 t o 0 015

• For RCC drains allowable is 6 m / s but pract ically it was rest rict ed 3 m / s
• For RCC drains -

  c) Float finish

  d) Gunit e, good 0.015

  0.013 t o 0.015 0.016 t o rest rict ed 3 m / s.

  d) Gunit e, good sect ion e)

  Gunit e, wavy sect ion 0.016 t o 0.019 0.018 t o 0.022

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay I m port ant Design Considerat ions I m port ant Design Considerat ions

7) Widt h and dept h?

• The widt h is as per t he local widt h available for t he const ruct ion of t he drains
• The widt h is as per t he local widt h available for t he
• Dept h should be est im at ed based on Manning’s form ula
• As far as possible rect angular
• Econom ical sect ion is b= 2d
• Som e places pipes were also used
• Som e places pipes were also used

  AS per I RC 50: Minim um widt h of drain should not be less AS per I RC 50: Minim um widt h of drain should not be less

  t han 250 m m and incase of pipe t he m inim um diam et er should not be less t han 450 m m .

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay I m port ant Design Considerat ions I m port ant Design Considerat ions

8. Slope of t he drains? Longit udinal slope?

• Generally slope should not be less t han 0.3%
• But in flat t errain it can go upt o 0.2%
• But in flat t errain it can go upt o 0.2%
• Slope is designed such t hat t he flow is always in sub- crit ical flow crit ical flow
• To avoid hydraulic j um p
• As pe r I RC 5 0 , a m in im u m lon git u din a l gr a die n t is 0 .3 %

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay I m port ant Design Considerat ions I m port ant Design Considerat ions

9. Free board?

  Generally for open channels a free board of 0.3 m is Generally for open channels a free board of 0 3 m is provided But Mum bai is having very flat t errain and does not

• allow t o have m ore free board. allow t o have m ore free board

  I RC recom m ends t he following free boards

• Bed widt h Bed widt h Free board Free board < 300 m m 10 cm 300 t o 900 m m 15 cm 900 t o 1500 m m 900 t 1500 30 cm

  30 Larger size 90 cm

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay Design Considerat ions Design Considerat ions

10. Type of inlet t o drains?

  

  Curb inlet Grat e

• Com b

  Design Considerat ions Design Considerat ions

  11. Junct ion box size?

• This should be designed as per t he velocit y of t he wat er crossing or j oining each ot her.
• This should be designed as per t he velocit y of t he

  12. Adequacy of nallah

  Level difference bet ween I L and Maxim um Wat er level in Level difference bet ween I L and Maxim um Wat er level in nallah

• I f t he I nvert ed Level of t he drain is lower t han t he MWL in nallah t hen nallah wat er st art s ent ering int o MWL in nallah t hen nallah wat er st art s ent ering int o t he drains
• Then slope has t o be m odified and designed such t h t t h I L f d i i b t h MWL f ll h t hat t he I L of drains is above t he MWL of nallah.

  

13. Connect ion bet ween t he Main drain on eit her side of t he road Prof. T I Eldho, Department of Civil Engineering, IIT Bombay Design Considerat ions Design Considerat ions

14) Design of drain draining t o t he creek or nallah having t idal effect .

  I f t he out let point of t he drain is t o a creek or

• a nallah whose wat er level rises according t o t he t ide level The I L of t he drains should be above t he high h f h d h ld b b h h h
• t ide level, else sea w at er ent ers t he drain I f possible a large size drains m ay be I f ibl l i d i b

• const ruct ed w hich can act as holding pong

  unt il t he high t ide level. unt il t he high t ide level

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  D a t a N e e de d for t h e de sign 

  I Rainfall int ensit y 

  Runoff coefficient

  

  Area cont ribut ing t o drains ( lengt h and widt h)

  

  Cross- sect ional param et ers of t he road

   

  RL of t he hydraulic m ount RL of t he hydraulic m ount

  

  RL of t he ground level,

  I L of t he drains

  I I . KEY PLAN OF TH E W ORK

  t he lengt h locat ion of nallah size, I L of drains at st art ing point and draining point Slope bet ween t he sect ions Ot her m aj or drainage work nearby/ or river nearby Ot her m aj or drainage work nearby/ or river nearby

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  D a t a N e e de d for t h e de sign

  I I I . D ETAI LED PLAN OF TH E ROAD

• – Lengt h ( in t erm s of chainage)
• – Locat ion of point sources and t heir discharge
• – Hydrologic m ount
• – RL of ground levels at chainage point s and ot her – RL of ground levels at chainage point s and ot her im port ant point s
• – Arrows showing t he flow direct ion of st orm wat er in t he drains
• – Locat ion of draining nallah
• – Locat ion and size of cross drainage work – Locat ion and size of cross drainage work
• – Locat ion of m an holes and t heir sizes
• – Any ot her it em relevant t o t he sit e specific design ( t o y

  p g ( be highlight ed)

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  D a t a N e e de d for t h e de sign

  I V . LON GI TUD I N AL SECTI ON D RAW I N G

• – Finished Road Level – RL of exist ing ground level
• – I L of drains
• – Bed levels, w at er levels of nallah
• – Locat ion of curb inlet point s
• – Locat ion and size of ot her point sources j oining t he drain

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Re fe r e n ce s Re fe r e n ce s Am erican Societ y of Civil Engineers and Wat er Environm ent

   Federat ion ( ASCE and WEF) . 1998. Urban Runoff Qualit y

Managem ent . WEF Manual of Pract ice No. 23, ASCE Manual and

Report on Engineering Pract ice No. 87.

   ht t p: / / ndm a.gov.in/ ndm a/ guidelines.ht m l

   ht t p: / / w w w .epa.gov/ oaint rnt / st orm w at er/ index.ht m

    Mark, Mark O., O Weesakul Weesakul, S., S Apirum anekul, Apirum anekul

  C., C Aroonnet , Aroonnet S B S.B., Dj ordj evic, S. ( 2004) . “ Pot ent ial and Lim it at ions of 1D Modelling of Urban Flooding.” J.Hydrology, 299, 284- 299

    Nat ional Disast er Managem ent Guidelines ( 2010) – Managem net Nat ional Disast er Managem ent Guidelines ( 2010) Managem net of urban flooding, Gov. of I ndia, New Delhi.

   Nat ional Research Council of t he Nat ional Academ ies ( NRC) . 2008.

  “ Urban Urban St orm wat er St orm wat er Managem ent Managem ent in in t he Unit es St at es ” t he Unit es St at es. The The Nat ional Academ ies Press. Washingt on, DC.

  Tu t or ia ls - Qu e st ion !.?.

   Crit ically st udy t he urban drainage design m et hodology adopt ed in design m et hodology adopt ed in I ndia?. h t t p:/ / n dm a .gov.in / n dm a / gu ide lin e s.h t m l h t t p:/ / n dm a gov in / n dm a / gu ide lin e s h t m l

      Com pare t he urban drainage design Com pare t he urban drainage design Com pare t he urban drainage design Com pare t he urban drainage design pract ices in USA, UK and I ndia and pract ices in USA, UK and I ndia and propose bet t er m anagem ent pract ices propose bet t er m anagem ent pract ices propose bet t er m anagem ent pract ices propose bet t er m anagem ent pract ices for I ndian Cit ies. for I ndian Cit ies.

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Se lf Eva lu a t ion - Qu e st ion s!.

  

  What are t he im port ant causes of urban flooding?

   

  What are t he difficult ies in urban flood m anagem ent ? What are t he difficult ies in urban flood m anagem ent ?

   Discuss wat ershed based urban flood m anagem ent .  

  Describe t he invent ories t o be t aken for st orm wat er Describe t he invent ories t o be t aken for st orm wat er drainage syst em .

  

  What are t he im port ant design considerat ions for urban drainage syst em s?.

  

  What are t he im port ant dat a t o be considered for roadside drainage design?. roadside drainage design?

  Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Assign m e n t - Qu e st ion s?. g Q 

  What are t he im port ant st rat egies for urban flood disast er risk m anagem ent ?.

   I llust rat e various urban drainage syst em s.

   What are t he im port ant design requirem ent s for urban drainage syst em s?.

   Discuss t he im port ant design considerat ions for roadside drainage design?.

   What are t he im port ant fact ors t o be

considered for roadside drainage design?.

  

Prof. T I Eldho, Department of Civil Engineering, IIT Bombay

  Dr. T. I. Eldho Dr. T. I. Eldho Professor, Professor, Department of Civil Engineering, Department of Civil Engineering, p p g g g g Indian Institute of Technology Bombay, Indian Institute of Technology Bombay, Mumbai, India, 400 076. Mumbai, India, 400 076. Email: Email: Email: Email: eldho@iitb.ac.in eldho@iitb.ac.in eldho@iitb.ac.in eldho@iitb.ac.in Phone: (022) – Phone: (022) – 25767339; Fax: 25767302 25767339; Fax: 25767302 http://www. http://www. civil.iitb.ac.in civil.iitb.ac.in