Date post: | 19-Jan-2015 |
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Technology |
Upload: | akanksha-chopra |
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Drainage Master plan for Delhi
UTTIPECSupported by OASIS Design
VisionPresented to Indian Flood Control Department
Issues…• No segregation between sewerage and storm water infrastructure. • Monsoon rains lead to water logging and inundation in the city. Water not
harvested and allowed to go waste, even when city faces water paucity. • Increase % of paved surfaces, reducing water percolation and increasing run
off. • Colonies situated in low lying areas experience acute drainage congestion
and backwater flow. • Drains flow from adjoining states (UP and Haryana) increasing pressure on
Delhi’s drainage system. • Unauthorised colonies adding to pressure on infrastructure. Sewerage, solid
waste, stormwater all dumped together in a single drain.• Pollution of River Yamuna, which is also a major source of water supply for
the city, by drains that carry sewage, solid waste, industrial waste etc.• Contaminated ground water.
Water Strategies
Implement “Zero Run-off” on Roads & Parks
Manage Storm water & Sewage/ Waste Water Locally & Naturally.
Create City level Watershed Management Plan and Urban Drainage Masterplan
Protect & Restore Natural Water Systems through bio-remediation.
WATER
Masterplan Policies for Natural Water Systems:
PERMEABLE SURFACES
IMPERMEABLE SURFACES Roads
Parking lotsBuilding
Pavements30 %
EVAPORATION
75%- 100% IMPERMEABLE
SURFACE
55 % RUNOFF
15% DEEPINFILTRATION
40 % EVAPORATION
10 % RUNOFF
50% DEEPINFILTRATION
75%- 100% PERMEABLE SURFACE
Idea : Federal Interagency Stream Restoration Working Group (FISRWG) US.
Impact of Urbanization
Only Roads & Open Greens provide opportunity for Storm Water catchment & Infiltration.
Storm water falling on road surface
Quickly collected in roadside drains
To the Naalas
To the river
Current Scenario
Drainage system in the city
As per MPD-2021:“ZERO RUN OFF”
DRAINAGE SHOULD BE ADOPTED”
At Present drainage system, we are doing“100% RUN OFF”
All the stormwater falls on road and it is diverted towards the closest Naala or
drain.
PRESENT Storm water management facility in the city
Storm water from road goes
to near by drain and then
to river.
Evaporation
To Nearby Drain
Most of the time, the existing system is clogged up
1: Treat at Source (streets, parks)
2: Natural Conveyance (minimal piping)
3: Natural Storm Water Treatment
• Utilize Parks and Open Spaces for Natural Storm Utilize Parks and Open Spaces for Natural Storm Water Management.Water Management.
• Adopt a 3-Tier Approach:Adopt a 3-Tier Approach:
To avoid Delhi Flash Floods
Reduced FLASH FLOODS Recharge of Ground Water
Less pressure and reduced sizing for Municipal Storm Water Treatment Plants.
PREVENT POLLUTING THE YAMUNA!11
Replenish Ground Water by minimizing Runoff & increasing local infiltration/ Recharge of Ground Water.
Minimize Runoff; Catch Storm Water locally.
CONVENTIONAL ROAD SECTION:
PROPOSED ROAD SECTION:
INSERT SWALE or PLANTER HERE
STREETS-EXISITNG
GREEN STREETS-RETROFIT OPTION-Showing storm water collection on streets
RAIN GARDEN
Roadside Greens should become Storm Water Filters & Conveyers.
Parks & Open Spaces should be zero run-off.
Parking structures should not be allowed under Parks.
Integrate Parking within buildings, or Restrict through Pricing.
Parking under parks makes them
dysfunctional as storm water catchments.
Create City level Watershed Management Plan and Urban Drainage Masterplan
Typical Watershed Map of a City, with multiple watershedsTypical Watershed Map of a City, with multiple watersheds
Watershed map using Digital Watershed map using Digital Elevation Model (DSSDI)Elevation Model (DSSDI)
• Integrated Watershed Management Plan (WMP) – is to
be prepared for Delhi so that Natural drainage systems can be
restored.
• At present IIT Delhi has been hired by IFCD for the preparation of
drainage Master Plan. However the Drainage Master Plan cannot
be an engineering project. Environment department is to be included in the preparation of the
plan.
Create City level Watershed Management Plan and Urban Drainage Masterplan
Protect & Restore Natural Water Systems through bio-remediation.
BEFOREAFTER© morphogenesis
Watershed mapping and catchment areas identification in GIS using DEM.
Integrated Storm water management strategy of each catchment, planning for working landscapes and street retrofitting to enable decentralization.
segregated sewage infrastructure, solid waste management and monitoring to ensure pollution free storm water drains.
Mandatory rainwater harvesting at micro level.
Way Forward…