Current Status of CRZ It’s implementation. by-Vasudev P. Mahale

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Details of the immense fieldwork required for accurately determining the high tide line (HTL). As clear from the CRZ notification 2011, HTL is an extremely significant parameter for determining the various coastal zones.

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Current Status of CRZ It’s implementation. by-Vasudev P. Mahale

  1. 1. National Institute of Oceanography, Dona Paula, Goa,. Current Status of CRZ It’s implementation By V.P. Mahale, A.K. Chaubey, G.M. Tirodkar & S.C. Vaz
  2. 2. Coast regions in general have become more economically attractive than in the past, and are hence exploited to the extent of being overused. Moreover, the coast line is sensitive and susceptible to degradation and are vulnerable to natural hazards. As a consequence, coastal region have become ecologically endangered. So we need to adopt means to conserve and protect it. Global scenario
  3. 3. Coastal plains and islands in India
  4. 4. Introduction Ø India’s coast line runs for 7,500 km Ø Over 25% of it’s population resides within its 50 km. Ø Rapid development has been observed all along the Indian Coastline, leading to severe environmental issues. Ø Though development is necessary for the economic growth of the country, care must be taken to avoid any major damage to the coastal and marine environment. Ø Keeping this in mind the first step was taken in 1976 by introducing Maritime Zone Act.
  5. 5. Evolution Ø A decade later MoEF promulgated EPA, 1986 Ø Over 25% of it’s population resides within its 50 km. Ø Subsequently to protect and conserve our coastline MoEF issued Coastal regulation Zone, 1991 under EPA Ø Under this the entire coast was classified into 4 zones. Ø CRZ, 1991 underwent 25 amendments in 2 decades Ø An attempt was made to constitute Coastal Management Zone under the Prof. Swaminathan Committee, 2004 Ø A report was submitted 2005
  6. 6. Incoporation Ø CMZ was declared lapsed 2008 Ø MoEF recommended re-notefying CRZ 1991 Ø Multi-lingual draft was published 2010 Ø Finally published on 6th Jan 2011 as CRZ Notification 2011 Ø IPZ is introduced to protect Islands
  7. 7. Implication of CRZ, 2011 Ø Special provision for Goa, Mumbai, Kerala and CVCAs Ø Clear procedure for approval with time frame Ø CRZ extended to include territorial waters Ø Preparation of new CZMP, valid up-to 24 months Ø Introduction of Hazard line; SoI to map; considering (tide, waves, sea-level rise, flooding and shoreline) Ø Shoreline to be mapped by time series satellite images Ø NDZ reduced from 200m to 100m for local communities Ø 7km radial studies around the project side ●
  8. 8. Current Status Ø Implementation of the CRZ was initially ignored by many state governments (Ref) Ø Casualties in Indian Ocean Tsunami demonstrated the gross neglect and was an eye-opener Ø Public utility, reclamation, alteration of tidal flow (bunding) prohibited activities needs to be addressed Ø To strengthen implementation post-clearance monitoring mechanism is introduced Ø Inspection of 7km radius around the project site Ø CRZ map preparation at 1:4000 scale
  9. 9. COASTAL REGULATION ZONE The Central Government, does hereby, declare the coastal stretches of the country and the water area up-to its territorial water limit, under Coastal Regulation Zone
  10. 10. Terminologies in CRZ • HTL High Tide Line (bottom line) • LTL Low Tide Line • OffsetSet-Back Lines • NDZ No Development Zone SEA
  11. 11. High Tide Line For the purposes of this notification, the High Tide Line (HTL) means the line on the land up-to which the highest water line reaches during the spring tide Low Tide Line It is the line or level that coincides with the Chart Datum along the coast.
  12. 12. Spatial Limits of CRZ CRZ shall apply to: Ø The land area: HTL to 500 m in case of sea HTL to 100 m in case of river Ø Intertidal zone: Between HTL and Low Tide Line Ø The water and the bed area between: LTL to 12 Nm in case of sea LTL to LTL in case of river
  13. 13. Ø Landward (monsoonal) berm crest in the case of sandy beaches Berm Identification
  14. 14. Ø Rocks, Headlands, Cliffs Rocks
  15. 15. Cliff Ø Rocks, Headlands, Cliffs
  16. 16. Seawalls/revetments/embankments Sea wall
  17. 17. Sea wall Seawalls/revetments/embankments
  18. 18. Sea wall Seawalls/revetments/embankments
  19. 19. CRZ CLASSIFICATIONS (i) CRZ - I : ECOLOGICALLY SENSITIVE AREAS (iii) CRZ - II : BUILT UP AREAS (v) CRZ - III : RURAL AREAS (iv) CRZ – IV : WATER AREAS
  20. 20. Differential Global Positioning System
  21. 21. DGPS accuracies
  22. 22. EQUIPMENT USED FOR CRZ SURVEY • Total Station Lasertrak Specification Range Accuracy : ±20cm Vertical Angle Accuracy : 0.25º Horizontal Angle Accuracy : 0.01º
  23. 23. EQUIPMENT USED FOR CRZ SURVEY • Total Station Quarryman Pro Specification Range Accuracy : ± 5 cm Angular Accuracy : 0.01º
  24. 24. Vertical Control Chart datum is the lowest level which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions Chart datum
  25. 25. EQUIPMENT USED FOR CRZ SURVEY • Echo Sounder Bathy 500 MF Specification Depth Accuracy : 0.02% of depth or 1cm whichever is greater
  26. 26. DEMARCATION OF LOW WATER LINE Tide pole
  27. 27. Kaladra Vengani Koliyad Shore line Erosion (Courtesy : anonymous) S a l t P a n Salt Pan Cliff ~ 7 m Sea wall collapseRoad breaching
  28. 28. (Salinity Contour, with station locations)
  29. 29. Mangroves Mangroves
  30. 30. Mangroves
  31. 31. Thank You

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