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…