Drainage masterplan for delhi - recommendations

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Drainage masterplan for delhi - recommendations

  1. 1. Drainage Master plan for Delhi Vision Presented to Indian Flood Control Department UTTIPEC Supported by OASIS Design
  2. 2. 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.
  3. 3. Water Strategies Masterplan Policies for Natural Water Systems:  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
  4. 4. Impact of Urbanization PERMEABLE SURFACES 10 % RUNOFF IMPERMEABLE Roads SURFACES Parking lots 40 % EVAPORATION 50% DEEP INFILTRATION 75%- 100% PERMEABLE SURFACE Idea : Federal Interagency Stream Restoration Working Group (FISRWG) US. 30 % EVAPORATION Building Pavements 55 % RUNOFF 15% DEEP INFILTRATION 75%- 100% IMPERMEABLE SURFACE
  5. 5. Only Roads & Open Greens provide opportunity for Storm Water catchment & Infiltration.
  6. 6. Current Scenario Storm water falling on road surface Quickly collected in roadside drains To the Naalas To the river
  7. 7. 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”
  8. 8. All the stormwater falls on road and it is diverted towards the closest Naala or drain.
  9. 9. 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
  10. 10. Most of the time, the existing system is clogged up
  11. 11. Minimize Runoff; Catch Storm Water locally. Replenish Ground Water by minimizing Runoff & increasing local infiltration/ Recharge of Ground Water. • Utilize Parks and Open Spaces for Natural Storm Water Management. • Adopt a 3-Tier Approach: To avoid Delhi Flash Floods 1: Treat at Source (streets, parks) 2: Natural Conveyance (minimal piping) 3: Natural Storm Water Treatment  Reduced FLASH FLOODS  Recharge of Ground Water  Less pressure and reduced sizing for Municipal Storm Water Treatment Plants.  11
  12. 12. CONVENTIONAL ROAD SECTION: PROPOSED ROAD SECTION:
  13. 13. STREETSEXISITNG INSERT SWALE or PLANTER HERE
  14. 14. GREEN STREETS-RETROFIT OPTION-Showing storm water collection on streets
  15. 15. Roadside Greens should become Storm Water Filters & Conveyers. RAIN GARDEN
  16. 16. Parks & Open Spaces should be zero run-off. Parking structures should not be allowed under Parks. Parking under parks makes them Integrate Parking within buildings, or Restrict through Pricing.
  17. 17. Create City level Watershed Management Plan and Urban Drainage Masterplan Typical Watershed Map of a City, with multiple watersheds Watershed map using Digital Elevation Model (DSSDI)
  18. 18. Create City level Watershed Management Plan and Urban Drainage Masterplan • 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.
  19. 19. Protect & Restore Natural Water Systems through bioremediation. BEFORE AFTER © morphogenesis
  20. 20. Way Forward…  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.

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