DOCSLIB.ORG

Storm Water Flood Modeling in Urban Areas

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Storm Water Flood Modeling in Urban Areas Storm Water Flood Modeling in Urban Areas Dr. Y.R. Satyaji Rao Scientist ’F’ and Head Deltaic Regional Centre National Institute of Hydrology Kakinada, A.P [email protected] Why Storm Water Flood Modeling ? To design effective storm water drains to avoid flooding or to identify flood prone areas in new urban areas To understand system inflow and outflow characteristics in new and existing urban areas To understand storm water network efficiencies in existing urban areas. To propose or incorporate various flood mitigation measures in existing urban areas Urban flooding It is triggered when surface runoff exceeds the capacity of drainage systems, which happens when heavy rainfall pours on sewers with the limited capacity, or even medium rainfall falls on poorly planned or operated drainage systems (Kamal and Rabbi, 1998; Arambepola, 2002). Definition of Urban Drainage Systems Urban drainage systems are defined as physical facilities that collect, store, convey, and treat runoff in urban areas. These facilities normally include detention and retention facilities, streets, storm sewers, inlets, open channels, and special structures such as inlets, manholes, and energy dissipaters” (ASCE and WEF, 1992). Popular Storm Water Model Software Packages US EPA (SWMM) DHI (MIKE URBAN) Bentley (Storm net) Wallingford XPSWMM XP Software Inc. SELECTED MODEL XP SWMM/EPA SWMM (Stormwater and Wastewater Management Model) XPSWMM used to develop link-node and spatially distributed models that are used for the analysis, design and simulation of storm and waste water system. It also models flow and pollutant in natural system including rivers, lakes, and floodplains with groundwater interaction. What Is SWMM? SWMM is a distributed dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. SWMM’s Process Models Hydrologic Modeling Features • Spatially and time varying rainfall • Evaporation of standing surface water • Snow accumulation and melting • Interception from depression storage • Infiltration into soil layers • Percolation into shallow groundwater • Interflow between groundwater & channels • Nonlinear routing of overland flow Hydraulic Modeling Features • Handles drainage networks of any size • Accommodates various conduit shapes as well as irregular natural channels • Model component consists of pumps, regulators, storage units etc. • Allows external inflows from runoff, groundwater, RDII, (Rainfall Derived Infiltration or Inflow) sanitary, DWF (Dry weather Flow), and user-supplied time series input • Uses flexible rule-based controls for pumps and regulators • Models various flow regimes, such as backwater, surcharging, reverse flow, and surface ponding Water Quality Modeling Features • Pollutant buildup over different land uses • Pollutant washoff during runoff events • Reduction in buildup from street cleaning • Inflows from user-defined sources and sanitary DWF • WQ routing through the drainage network • User-defined treatment functions Typical Applications of SWMM • Design and sizing of drainage system components including detention facilities • Flood plain mapping of natural channel systems • Control of combined and sanitary sewer overflows • Generating non-point source pollutant loadings for wasteload allocation studies • Evaluating BMPs Limitations of SWMM • Not applicable to large-scale, non-urban watersheds • Not applicable to forested areas or irrigated cropland • Cannot be used with highly aggregated (e.g., daily) rainfall data • Its an analysis tool, not an automated design tool Process of Storm to Sewer network Storm Hydrological model Catchment Sewer Hydraulic model Design of Storm sewer system Design storms are routinely used for designing storm sewer system. A design storm is a hypothetical storm with specific duration D and return period T. The information of design storms is conveniently presented in the form of depth-duration-frequency (DDF) curves or intensity-duration-frequency (IDF) curves. Modeling of Storm Sewer System Rainfall Losses model Effective rainfall SCS/Unit hydrograph Inflow hydrograph of the inlet Non-steady flow hydraulics numerical solutions Outflow hydrograph of sewer system BASE MAP PHASE DERIVED MAP PHASE SUB_BASIN AREA ELEV SLOPE SOILS INFIL HOUSES RUNOFF MODEL INPUT DRIVEWAYS CUL-DE-SACS IMPERV ROADS ROADS DRAIN NET GUTTER LENGTH CANALS Procedure for GIS to SWMM ITERPRETIVE PHASE FINAL PHASE SUB_BASIN Q1 Point Discharge SUB_BASIN l RUNOFF MODEL INPUT SUB_BASIN Ql TOTAL PEAK DISCHARGE DRAIN GUTTER LENGTH Note: for each sub basin in SUB_BASIN Qn Procedure for GIS to SWMM SWMM Model Structure Two Case Studies: Patna and Chennai Chennai Floods The last century records on catastrophic flooding in Chennai 1946 (Chembarambakkam tank surplused into Adayar river with a discharge 20,000 Cusecs) 1976 (Heavy flood at Adayar-Kotturpuram) 1985 (Floods in Adayar River and discharge 63,000 Cusec) 1996 (Karanodal bridge collapsed) 1998 (Madvaram surplus water ) 2005 (100 yr recurring rainfall of 40 cm in a day caused heavy inundation in and around Chennai city) Main reasons for these floods caused by heavy rain associated by cyclonic activity and failure of major rivers and other drainage systems. ….Chennai Floods • Late Thiru A.R. Venkatachari, who was a special Superintending Engineer, investigated Madras floods of 1943 and suggested to adopt a value of 1000 for “C” in the Ryve’s formula for calculating flood discharge for tanks. This suggestion has not been actively pursued and almost all the tanks of the surplus weirs were designed for a “C” value of only 500. It was concluded that this is one of the major reasons for the beach of the tanks. ..Chennai Floods • Mott MacDonald International, Cambridge, UK in the year 1993, studied three cases of catastrophic flooding in Madras in the 20th century occurred in 1943, 1976 and 1985. It was concluded that heavy rains associated with cyclonic activity caused these floods and these events were all attributed to failure of the major river drainage systems. In addition to these, it was also mentioned that flooding of a less catastrophic nature occurs regularly in low-lying areas of the city where the local drainage infrastructure is inadequate or inoperative. ..Chennai Floods • Thereafter, there is no scientific study has been conducted on urban hydrology of Chennai city (using 15 minute rainfall and 0.25 m topographical details). However, comprehensive developmental activities related to micro/macro drainage system in Chennai Metropolitan city has been proposed by Chennai Metropolitan Development Authority (CMDA) in the second master plan of Chennai metropolitan city up to 2026 (www.cmdachennai.org). ..Chennai Floods • Recently, Chennai Corporation has taken up the project aiming at creating economically productive, efficient, equitable and responsive cities especially on comprehensive storm water management facilities for Chennai Corporation under JNNURM. • Among various needs, the storm water drainage for urban areas is becoming a problem and is highly complicated. Therefore, it is high time to review and redesign the storm water drainage systems to find out engineering solutions. • M/s Aarvee Associates, Hyderabad have been hired to conduct topographical surveys, and mapping existing storm water drains/roads along with C/S details. Project Objectives: 1. Evaluation of existing storm water drainage network efficiency in the study area 2. To find out the inflow-outflow hydrograph at various outlets and the water surface profile along the storm water drains. 3. Feasibility of improvement of the existing storm water drainage network or to propose additional network to mitigate urban storm water flooding in the study area. 4. Dissemination of results of the project through workshops/ brain storming sessions/awareness programs with the help of NGO’s/Govt., departments/Academic Institutions in the study area and elsewhere. Project Location Tamilnadu Chennai Corporation with sub watersheds Otteri nullah sub basin Otteri nullah watershed ….Project Area Total Length: 10.0 km Watershed area: 30 sqkm Nungambakkam Rain Gauge Station (IMD) Average Annual Rainfall: 1300 mm Highest daily rainfall 40 cm (2005) Highest hourly rainfall 93.5 mm (1996) Delineation of Watersheds in Chennai Corporation Instrumentation in Project Location: Monitoring Network of Rain gauges and Water level Recorders Application of Model (XP-SWMM) Schematization of Project Area: Micro watersheds(86), Node (121) and Links (120) Delineated micro watersheds of the study area in XP-SWMM Connectivity of micro watersheds with nodes in XP-SWMM Details of links considered in the XP-SWMM Model Testing 6.5 0 7.0 0 6.0 6.5 10 20 6.0 5.5 40 20 5.5 5.0 60 Stage(m) Stage(m) 5.0 Rainfall (mm) 30 Rainfall(mm) 4.5 4.5 80 4.0 40 4.0 100 1 6 11 16 21 1 6 11 16 21 Time(hr) Time(hr) Rainfall Model Observed Rainfall model Observed Comparison between observed and modeled Comparison between observed and modeled stage at Anna Nagar (25th Oct. 2011) stage at Anna Nagar (4th Nov. 2011) Rainfall Modeled Observed 0 6.9 5 6.4 10 5.9 15 Stage (m) Stage 5.4 20 4.9 25 (mm/hr) Intensity Rainfall 4.4 30 1 9 17 25 33 41 49 Time (hr) Comparison between observed and simulated stage at Anna Nagar (25-10-2011, 9.00 to 27-10-2011, 12.00 hrs) 5.6 R2 = 0.8469 5.4 5.2 5.0 4.8 Observed (Stage in m) in (Stage Observed 4.6 4.4 Correlation between observed and 4.4 4.6 4.8 5 5.2 5.4 5.6 simulated stage at Anna Nagar Modeled (Stage in m) Rainfall
Load more

Recommended publications
  • The Chennai Comprehensive Transportation Study (CCTS)
    ACKNOWLEDGEMENT The consultants are grateful to Tmt. Susan Mathew, I.A.S., Addl. Chief Secretary to Govt. & Vice-Chairperson, CMDA and Thiru Dayanand Kataria, I.A.S., Member - Secretary, CMDA for the valuable support and encouragement extended to the Study. Our thanks are also due to the former Vice-Chairman, Thiru T.R. Srinivasan, I.A.S., (Retd.) and former Member-Secretary Thiru Md. Nasimuddin, I.A.S. for having given an opportunity to undertake the Chennai Comprehensive Transportation Study. The consultants also thank Thiru.Vikram Kapur, I.A.S. for the guidance and encouragement given in taking the Study forward. We place our record of sincere gratitude to the Project Management Unit of TNUDP-III in CMDA, comprising Thiru K. Kumar, Chief Planner, Thiru M. Sivashanmugam, Senior Planner, & Tmt. R. Meena, Assistant Planner for their unstinted and valuable contribution throughout the assignment. We thank Thiru C. Palanivelu, Member-Chief Planner for the guidance and support extended. The comments and suggestions of the World Bank on the stage reports are duly acknowledged. The consultants are thankful to the Steering Committee comprising the Secretaries to Govt., and Heads of Departments concerned with urban transport, chaired by Vice- Chairperson, CMDA and the Technical Committee chaired by the Chief Planner, CMDA and represented by Department of Highways, Southern Railways, Metropolitan Transport Corporation, Chennai Municipal Corporation, Chennai Port Trust, Chennai Traffic Police, Chennai Sub-urban Police, Commissionerate of Municipal Administration, IIT-Madras and the representatives of NGOs. The consultants place on record the support and cooperation extended by the officers and staff of CMDA and various project implementing organizations and the residents of Chennai, without whom the study would not have been successful.
    [Show full text]
  • Urban and Landscape Design Strategies for Flood Resilience In
    QATAR UNIVERSITY COLLEGE OF ENGINEERING URBAN AND LANDSCAPE DESIGN STRATEGIES FOR FLOOD RESILIENCE IN CHENNAI CITY BY ALIFA MUNEERUDEEN A Thesis Submitted to the Faculty of the College of Engineering in Partial Fulfillment of the Requirements for the Degree of Masters of Science in Urban Planning and Design June 2017 © 2017 Alifa Muneerudeen. All Rights Reserved. COMMITTEE PAGE The members of the Committee approve the Thesis of Alifa Muneerudeen defended on 24/05/2017. Dr. Anna Grichting Solder Thesis Supervisor Qatar University Kwi-Gon Kim Examining Committee Member Seoul National University Dr. M. Salim Ferwati Examining Committee Member Qatar University Mohamed Arselene Ayari Examining Committee Member Qatar University Approved: Khalifa Al-Khalifa, Dean, College of Engineering ii ABSTRACT Muneerudeen, Alifa, Masters: June, 2017, Masters of Science in Urban Planning & Design Title: Urban and Landscape Design Strategies for Flood Resilience in Chennai City Supervisor of Thesis: Dr. Anna Grichting Solder. Chennai, the capital city of Tamil Nadu is located in the South East of India and lies at a mere 6.7m above mean sea level. Chennai is in a vulnerable location due to storm surges as well as tropical cyclones that bring about heavy rains and yearly floods. The 2004 Tsunami greatly affected the coast, and rapid urbanization, accompanied by the reduction in the natural drain capacity of the ground caused by encroachments on marshes, wetlands and other ecologically sensitive and permeable areas has contributed to repeat flood events in the city. Channelized rivers and canals contaminated through the presence of informal settlements and garbage has exasperated the situation. Natural and man-made water infrastructures that include, monsoon water harvesting and storage systems such as the Temple tanks and reservoirs have been polluted, and have fallen into disuse.
    [Show full text]
  • Storm Water Flood Modeling in the Sub- Basin of Chennai Corporation, Chennai, Tamilnadu, India
    Storm Water Flood Modeling in the Sub- basin of Chennai Corporation, Chennai, Tamilnadu, India Dr. Y. R. Satyaji Rao Scientist F and Head Deltaic Regional Centre National Institute of Hydrology Kakinada 533003, Andhra Pradesh, India Website: www.nih.ernet.in Types of Flooding (Geographically): Riverine flooding It happens when extreme rainfall attacks in a river basin (Mississippi, 1993; Miller, 1997; Changman, 1998; Li and Guo et al., 1999; NVE, 2000; Meade, 2002). Urban flooding It is triggered when surface runoff exceeds the capacity of drainage systems, which happens when heavy rainfall pours on sewers with the limited capacity, or even medium rainfall falls on poorly planned or operated drainage systems (Kamal and Rabbi, 1998; Arambepola, 2002). Coastal flooding It takes place when heavy rainfall on inland encounters storm surges from the sea (Miller, 1997; Barry, 1997; Smith and Ward, 1998; Parker1, 2000; Pilarczyk and Nuoi, 2002). Definition of Urban Drainage Systems Urban drainage systems are defined as physical facilities that collect, store, convey, and treat runoff in urban areas. These facilities normally include detention and retention facilities, streets, storm sewers, inlets, open channels, and special structures such as inlets, manholes, and energy dissipaters” (ASCE and WEF, 1992). Why Urban Floods are increasing ? Increase in Flood peak and storm water network designs are old (Design limitations) Improper maintenance of storm water network (Carrying capacity) Impact of Boundary Conditions (Confluence points/backwater/tides)
    [Show full text]
  • Macro Drainage System in Cma
    Chapter X MACRO DRAINAGE SYSTEM IN CMA Introduction: CMA lies along the east coast of Southern India and is traversed by three major rivers namely Kosasthalaiyar River, Cooum River and Adyar River. The climate of the region is dominated by the monsoons, which are caused by thermal contrast between land and sea. Monsoon climates are characterised by clearly marked seasons with specific types of wind and weather. The South West monsoon dominates weather patterns in Tamilnadu from July –September and is characterised by periods of sultry wet weather. Rain shadow effects limit rainfall in the east coast in Tamilnadu and it is light or intermittent during this season. This period is followed by North-East Monsoon, which brings cool cloudy weather, relatively free of rain over most of the monsoon- dominated land (India). The exception is South-East-India including Tamilnadu where about 78% of the annual rainfall occurs at this time. The start of the heavy rains usually falls in October lasting up to December. Most of the rainfall is associated with clear synoptic systems of depressions and cyclones with night time rainfall most common. In CMA between October and December most of the rainfall occurs and it is rare between January and April. 10.02 River Nagari which has a large catchment area in the Chittoor District (Andhra Pradesh) region and the Nandi River, which has catchment area in the Vellore District, join near Kanakamma Chattiram and enter Poondi Reservoir. Kosasthalaiyar River, which has its origin near Kaveripakkam and has catchment area in North Arcot District, has a branch near Kesavaram Anicut and flows to the city as Cooum River and the main Kosasthalaiyar river flows to Poondi reservoir.
    [Show full text]
  • Abstract Water Resources Department-Improvements of Macro Drainages
    Abstract Water Resources Department-Improvements of Macro Drainages maintained by Public Works Department in four basins of Chennai City as approved under JNNURM for a value of Rs.633.03 crore -Administrative Sanction- Accorded - Orders-Issued. Public Works (K1) Department GO (Ms) No.240 Dated: 16.10.2009 Thiruvalluvar Andu 2040 Purattasi 30. Read: From the Chief Engineer, Water Resources Department, Chennai Region, Letter No.T1/AE1/18711/ 2007 dated 31.3.2009 and 5.8.2009 ----- ORDER: The Chief Engineer, Chennai Region, in his letter read above, has stated that in Chennai City, flooding due to frequent heavy rains and rapid change of entire topography because of unauthorized constructions & deviations, causes inundation, inconvenience to the public, loss of lives and livestock, spreading of epidemic diseases etc. and this made Corporation of Chennai to prepare a Comprehensive Master Plan on storm water, integrating the Waterways and Macro drainages, like, Buckingham Canal, Otteri Nullah, Virugambakkam - Arumbakkam drain, Cooum and Adyar river. Detailed Project Report for the improvements to Micro and Macro drainages in four basins of Chennai has been prepared and placed in the State Level Steering Committee meeting held in December 2008 and recommended for approval under Jawaharlal Nehru National Urban Renewal Mission (JNNURM). After the scrutiny and Technical appraisal by the Central Public Health and Environmental Organisation (CPHEO), the Detailed Project Report was placed before the Central Sanctioning and Monitoring Committee (CSMC) and approved, as detailed below: 2 Corporation Proposal PWD of Chennai S. Name of cost component Component No. Basin (Rs.in (Rs.in (Rs.in crore) crore) crore) 1 Northern 359.86 82.69 277.17 Basin 2 Central 345.00 83.89 261.11 Basin 3 Eastern 444.07 303.67 140.40 Basin 4 Southern 298.98 162.78 136.20 Basin Total 1447.91 633.03 814.88 2.
    [Show full text]
  • Chennai District Origin of Chennai
    DISTRICT PROFILE - 2017 CHENNAI DISTRICT ORIGIN OF CHENNAI Chennai, originally known as Madras Patnam, was located in the province of Tondaimandalam, an area lying between Pennar river of Nellore and the Pennar river of Cuddalore. The capital of the province was Kancheepuram.Tondaimandalam was ruled in the 2nd century A.D. by Tondaiman Ilam Tiraiyan, who was a representative of the Chola family at Kanchipuram. It is believed that Ilam Tiraiyan must have subdued Kurumbas, the original inhabitants of the region and established his rule over Tondaimandalam Chennai also known as Madras is the capital city of the Indian state of Tamil Nadu. Located on the Coromandel Coast off the Bay of Bengal, it is a major commercial, cultural, economic and educational center in South India. It is also known as the "Cultural Capital of South India" The area around Chennai had been part of successive South Indian kingdoms through centuries. The recorded history of the city began in the colonial times, specifically with the arrival of British East India Company and the establishment of Fort St. George in 1644. On Chennai's way to become a major naval port and presidency city by late eighteenth century. Following the independence of India, Chennai became the capital of Tamil Nadu and an important centre of regional politics that tended to bank on the Dravidian identity of the populace. According to the provisional results of 2011 census, the city had 4.68 million residents making it the sixth most populous city in India; the urban agglomeration, which comprises the city and its suburbs, was home to approximately 8.9 million, making it the fourth most populous metropolitan area in the country and 31st largest urban area in the world.
    [Show full text]
  • Presented by Dr. Y.R. Satyaji Rao Deltaic Regional Centre National Institute of Hydrology Kakinada, A.P., [email protected] Global Potential Risk of Urban Flooding
    International Soil and Water Assessment Tool Conference (SWAT-2018), 10-12 Jan., 2018 Presented by Dr. Y.R. Satyaji Rao Deltaic Regional Centre National Institute of Hydrology Kakinada, A.P., [email protected] Global Potential Risk of Urban Flooding 2011 1970 Multiple & uncertain drivers of future change Extreme rainfall events Nutrient and pollutant loading Urbanisation effects Land use change 2025 Socio-economic trends Transient shocks vs. Chronic stresses Storm Water Runoff in urban areas No measurements on storm water Quantity and Quality Indirect estimation of quantity from Hydraulic structures or storm water drains No information on flood prone area (Depth, Duration and Area) No information on high resolution topography Mixing up of storm water, waste water and sewage water Natural filling up of water bodies, temple tanks, reservoirs Limited information on artificial groundwater recharge No information on storm water reuse/conservation No forecast on urban floods for Transport authorities/ Infrastructure developers/ Govt., and public sectors/other sectors Floods frequency from 1900 to 2014 (Source: EM-DAT International Disaster Database Highest Daily Rainfall events (Observed) Mumbai: 94.42 cm/day (26.07.2005) 36.62 cm/day (08.08.1997) 29.76 cm/day (30.08.2017) Chennai:33.78 cm/day (30.11.2015) 14.40 cm/day (Aug 2005) Hyderabad:24.16 cm/day (24.08.2000) 16.71 cm/day (21.09.2016) Bangalore: 16.6 cm/day (year 1890) 18.4 cm/day (14.8.2017) Amaravati: 20 cm/day (16.10.1969) 15 cm/day (01.11.1994) 13.76 cm/day (21.9.1997) Methodology Why Storm Water Flood Modeling ? To design effective storm water drains to avoid flooding or to identify flood prone areas in new urban areas To understand system inflow and outflow characteristics in new and existing urban areas To understand storm water network efficiencies in existing urban areas.
    [Show full text]
  • Floods in Chennai in 2015 a Documentation of Urban Flood Management and Disaster Preparedness for Lessons for Urban Governance
    Floods in Chennai in 2015 A documentation of urban flood management and disaster preparedness for lessons for urban governance Citizen consumer and civic Action Group (CAG) This report provides a summary of the research and documentation efforts undertaken by CAG as part of the Way Forward Chennai initiative and was supported by a grant from Action Aid. It was authored by Pavithra Sriram and Satyarupa Shekhar, with support from Om Prakash Singh, Pramyudh Muralidhar, Madonna Thomas and Rajesh Ramamoorthy, CAG, with overall guidance and support from Kirtee Shah, INHAF and Tara Murali. CAG. Table of Contents 1 Way Forward Chennai - a pan India initiative ........................................................................... 3 1.1 Who we are ..................................................................................................................................... 3 1.2 What we do ..................................................................................................................................... 4 1.3 Who we work with ....................................................................................................................... 4 2 Introduction ............................................................................................................................................ 5 3 Literature review................................................................................................................................... 6 3.1 Urban flood management .........................................................................................................
    [Show full text]
  • Session – 3 River and Drainage System In
    SESSION – 3 RIVER AND DRAINAGE SYSTEM IN CMA Session – III Waterways in Chennai Thiru T.Kanthimathinathan, Eexecutive Engineer, PWD & Nodal Officer, Cooum Sub Basin Restoration & Management CHENNAI METROPOLITAN AREA • Chennai Metropolitan Area (CMA) covers 1189 Sq. Km. present population about 75 Lakhs projected to 98 Lakhs in 2011 • Chennai City covers 176 Sq. Km. having Terrain slope varying from 1 : 5000 to 1 : 10,000 • The City is drained by 2 rivers besides a number of major & minor drains through Buckingham Canal into Sea via Ennore Creek, Cooum mouth, Adyar mouth and Kovalam Creek. • Major Flood Events in Chennai City experienced during 1943, 1976, 1985,1996 & 2005 177 RIVERS AND DRAINAGE SYSTEM OF CHENNAI METROPOLITAN AREA Km. Orgin in Km. in Km. System in Sq.Km. 2005 in C/s. 2005 in C/s. Capacity in Capacity C/s Bed width in M. in Bed width River / Drainage Anticipated flood flood Anticipated discharge/ Presnet discharge/ Presnet Length in CMA in in CMA Length Flood discharge in Flood discharge with Bay of Bengal Total Length in Km. in Length Total Length in City Limits Limits in City Length Total Catchment Area Area Catchment Total Location of confluence confluence Location of RIVERS Krishnapuram (AP) for nagri am / 150 Kaveripakkam 125000/ Kosasthalaiyar Ennore Creek 136 16 3757 to 90000 (Vellore District) 110000 250 for Kosasthalaiyar arm Cooum Tank (Thiruvallur Cooum District) 40 to 22000/ Cooum Mouth near 72 18 40 400 21500 Kesavaram for 120 19500 Napier Bridge diversion from Kosasthalaiyar 10.50 Adanur Tank near 60000/
    [Show full text]
  • Storm Water Drainage of Chennai - Lacuna, Assets, and Way Forward
    Storm water drainage of Chennai - Lacuna, Assets, and Way Forward Balaji Narasimhan Associate Professor Dept. of Civil Engineering IIT Madras Outline Chennai Rainfall Historic Intensity – Duration – Frequency curve A perspective of Dec.1, 2015 rainfall • Chembarambakkam reservoir release Lacuna Assets Way Forward Sustainable Urban Storm water Drainage System (SUDs) GIS based data management and modelling system Dec.1, 2015 Landuse Chembarambakkam Release Reach "Reach-2" Results for Run "Run 1" 900 800 700 600 500 400 F lo w (c m s ) 300 200 100 0 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 Nov 2015 Dec2015 Run:Run 1 Element:Reach-2 Result:Outflow Run:Run 1 Element:Reach-2 Result:Combined Flow Estimated unregulated flow from the reset of the watershed Reach "Reach-8" Results for Run "Run 1" 3,500 3,000 Modelled using HEC-HMS 2,500 2,000 1,500 F lo w (c m s ) 1,000 500 0 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 Nov 2015 Dec2015 Run:Run 1 Element:Reach-8 Result:Outflow Run:Run 1 Element:Reach-8 Result:Combined Flow Flooding Vs water logging Flooding in December could not have been prevented Chembarambakkam release is only a small piece in the entire scheme that lead to Chennai flooding However an efficient, well designed, well maintained storm drainage system could have minimized the level of water logging and damage Causes and types of urban flooding Lacuna Insufficient coverage with storm water drains Lack Proper connectivity Linkage to major canals and waterways Insufficient capacity Original design intensity of 31.39 mm/h • 1hr storm duration
    [Show full text]
  • Egmore Museum, Chennai Initial Environmental Examination
    Initial Environmental Examination Document Stage: Project Number: 40648-037 March 2018 IND: Infrastructure Development Investment Program for Tourism (IDIPT) Tranche 4 — Improvement works in Government Museum (Egmore museum), Chennai, Chennai District. Package No. IDIPT/TN/T4/NCB/11/2017 Prepared by the Department of Tourism and Culture Government of Tamil Nadu for the Asian Development Bank. This initial environmental examination report is a document of the borrower. The views expressed herein do not necessarily represent those of ADB's Board of Directors, Management, or staff, and may be preliminary in nature. In preparing any country program or strategy, financing any project, or by making any designation of or reference to a particular territory or geographic area in this document, the Asian Development Bank does not intend to make any judgments as to the legal or other status of any territory or area. CURRENCY EQUIVALENTS (as of 15 December 2017) Currency unit – Indian rupee (₹) ₹1.00 = $0.0156 $1.00 = ₹64.2650 ABBREVIATIONS ADB - Asian Development Bank CAC - common air contaminants CFE - consent for establishment CFO - Consent for operation CRZ - Coastal Regulation Zone DOT - Department of Tourism PMSC - Project Management and Supervision Consultant EIA - Environmental Impact Assessment EMP - Environmental Management Plan GoI - Government of India IEE - Initial Environmental Examination NGO - non-government organization NOC - No Objection Certificate PIU - Project Implementation Unit PMSC - Project Management Consultant PMU - Project Management Unit RCC - Reinforced Cement Concrete ROW - right-of-way SPS - Safeguard Policy Statement NOTE In this report, "$" refers to US dollars. CONTENTS Page EXECUTIVE SUMMARY I. INTRODUCTION 1 A. Background 1 II. DESCRIPTION OF THE SUBPROJECT 3 A.
    [Show full text]
  • Report on Case Studies Main Report
    Engineering Knowledge and Research Programme (KaR 8332) Water Demand Management in areas of groundwater over- exploitation REPORT ON CASE STUDIES MAIN REPORT January 2005 in association with VRV Consultants (P) Ltd, Chennai, India Jouzy & Partners, Amman, Jordan DFID Engineering Knowledge and Research Programme Project Number R8332 Water Demand Management in Areas of Groundwater Over-Exploitation Report on Case Studies (January 2005) – Main Report ____________________________________________________________________________________________________________________________________________________________________________________________________ REPORT ON CASE STUDIES MAIN REPORT CONTENTS SUMMARY 1 PART I INTRODUCTION 1. THE RESEARCH PROJECT 5 1.1 Background and objectives.............................................................................5 1.2 Research programme.....................................................................................6 1.3 Research organisations and collaborators .....................................................6 2. THE CASE STUDIES 7 2.1 Choice of case study areas ............................................................................7 3. PURPOSE OF THE REPORT 7 PART II WATER DEMAND MANAGEMENT AND LIVELIHOODS 1. WATER DEMAND MANAGEMENT 9 1.1 General...........................................................................................................9 1.2 Supply augmentation, water quality improvement & demand management ..9 1.3 Water demand management and supporting measures ..............................10
    [Show full text]