Presentation on the Sixth meeting of the CPDAC Sub-Committee on Performance Evaluation of Coastal Protection Works R.Thangamani Director Beach Erosion Directorate, CWC, Kochi and Member- Secretary of the Sub-Committee
BackGround of Formation of CPDAC-Sub-Committee on Performance Evaluation of Coastal Protection Works • During the 6 th meeting of CPDAC meeting held at Puduchery on 7 th April-2004, before taking up the agenda items, discussions took place on functions of CPDAC given in the Ministry of Water Resources (MoWR) resolution No: 15/2/91- BM Dated 17 th April, 1995. Vide Clause ‘ 3 (iv)’ of the resolution, CPDAC has been given the mandate – “To review the performance of the works carried out by the states and evolve improved design techniques based on such experience from time to time” .
Constitution of CPDAC-Sub-Committee on Performance Evaluation of Coastal Protection Works • Initial Composition of this Sub-Committee in 2004 • Chief Engineer, C&SRO, CWC, Coimbatore - Convener • Joint Director, CWPRS, Pune - Member • Space Application Centre, Ahmedabad - Member • Representative of State/UT - Member • Director, Beach Erosion Dte, CWC, Kochi - Member- Secretary
Reconstitution of CPDAC-Sub-Committee on Performance Evaluation of Coastal Protection Works Re-Constitution of this Sub-Committee in 2011 based on the decision of the 12th CPDAC meeting held at Bhubaneswar during 3 rd &4 th March- 2011 • Chief Engineer, CSRO, CWC, Coimbatore Convener • Joint Director, CWPRS, Pune Member • Representative of SAC, Ahmedabad Member • Representative of concerned State/UT Member • Representative of NIO, Goa Member • Director, Beach Erosion Dte, CWC, Kochi Member-Secretary
Reconstitution of CPDAC-Sub-Committee on Performance Evaluation of Coastal Protection Works Re-Constitution of this Sub-Committee in 2012 based on the decision of the 13th CPDAC meeting held at Mangalore during 9 th & 10 th Feb-2012 • Chief Engineer, CSRO, CWC, Coimbatore Convener • Joint Director, CWPRS, Pune Member • Representative of SAC, Ahmedabad Member • Representative of concerned State/UT Member • Representative of NIO, Goa Member • Director, Coastal Erosion Dte, CWC, New Delhi Special Invitee • Director, Beach Erosion Dte, CWC, Kochi Member-Secretary
Meetings of the CPDAC-Sub-Committee on Performance Evaluation of Coastal Protection Works Sl.No Meeting Dates of the meeting State/UT and venue Details of the meeting 1 First 12/7/2004 & 13/7/2004 Kerala/Kochi 2 Second 04/5/2005 & 05/05/2005 Karnataka/ Mangalore 3 Third 17/10/2005 & Goa 18/10/2005 06 th to 08 th /01/2011 4 Fourth Lakshadweep/ Kavaratti 5 Fifth 26 th to 28 th /07/2011 Tamil Nadu/ Chennai 18 th & 19 th June-2015 6 Sixth Gujarat/Surat
Members present in the 6 th Meeting of the CPDAC sub committee on Performance Evaluation of Coastal Protection Works held on 18 th &19 th June-2015 • CPDAC Sub-Committee members participated in the Sixth meeting 1.Shri J Chandrashekhar Iyer, Chief Engineer, C&SRO,CWC, Coimbatore - Convenor 2.Shri. A.D Kanani, Superintending Engineer, Surat Irrigation Circle, Surat- Member 3. Dr. M.D Kudale, Joint Director,CWPRS, Pune- Member 4.Dr. Illangovan , Senior Principal Scientist , NIO, Goa- Member 5.Dr. A.S Rajawat, Head, Geo Sciences Division, SAC, Ahmedabad- Member 6.Shri. Rajesh Yadav, Director, Coastal Erosion Dte., CWC, New Delhi- Member 7.Shri R.Thangamani, Director, Beach Erosion Dte., CWC, Kochi- Member- Secretary
Meeting of Sub-Committee in progress – 18/6/15 at Surat
Gujarat Coast • Coast line of Gujarat is divided into 4 regions mainly I. South Gujarat II.Khambhat III.Sourashtra IV.Kutchh The Coastal protection works selected for the performance evaluation are lying in the districts of Surat, Navsari and Valsad which lies in the South Gujarat Coast region.
Gujarat Coast SAC-CWC-Study- using Satellite data of 1989-91 and 2004-06 time frame on 1: 25,000 Scale Zone Accretion Erosion Stable Total length length length length (km) (km) (km) (km) South 8.02 146.21 4.73 158.96 Gujarat Khambhat 79.30 48.38 66.79 194.47 Saurashtra 80.28 178.51 574.57 833.36 Kutchh 130.39 113.33 51.62 295.34 Total 297.99 486.43 697.71 1482.1 3
Study Area- South Gujarat Coast District Accretion Erosion Stable Total length length length length (km) (km) (km) (km) Surat 4.36 57.62 0.00 61.98 Navsari 0.00 23.35 0.00 23.35 Valsad 3.66 65.24 4.73 73.63 Total 8.02 146.21 4.73 158.96
Sites inspected • Sub-committee undertook a field visit on 18 th & 19 th of June 2015 1. Dumas- Rubble Mound Sea Wall- 18/6/2015
1. Dumas- 18/06/2015
2. Danti-Jalalpore – P.P Rope Gabion Supported with retaining wall- 18/06/2015
2. Danti-Jalalpore on 18/06/2015
3. Onjal-Machhiwad – P.P.Rope Gabion ( Strengthened with Heavy stones later )- 19/06/2015
3. Onjal-Machhiwad -19/06/2015
4. Moti-Danti & Nani Danti - P.P.Rope Gabion ( Strengthened with Heavy stones later )- 19/06/2015
4. Site Moti- Danti & Nani-Danti- 19/6/15
5. Tithal- Rubble Mound Sea Wall- 19/06/2015
5. Tithal - 19/06/2015
6. Kolak-Udwada- Rubble mound sea wall- 19/06/2015
6. Kolak-Udwada -19/06/2015
Summary • The Sixth meeting of the CPDAC- Sub-Committee on performance evaluation of coastal protection works was held on 18th June-2015 at Surat and evaluation of coastal protection works in South Gujarat Districts namely Surat , Navsari and Valsad were taken up. • The type of anti-sea erosion measures undertaken at six sites inspected and evaluated by the sub-committee are (i) Dumas- Rubble Mound Sea wall (ii) Danti-Jalalpore- Poly Propylene Rope Gabion supported with retaining wall (iii) Onjal-Machhiwad- P.P Rope Gabion (strengthened with Heavy Stones later ) (iv) Moti-Danti & Nani-Danti- P.P.Rope Gabion (Strengthened with Heavy stones later) (v) Tithal – Rubble Mound Sea wall and (vi) Kolak-Udwada- Rubble Mound Sea wall.
• After field inspections, the committee held a wrap-up discussion on 19 th June-2015 and the observations of the committee are , – The anti-sea erosion measures being undertaken by the State of Gujarat is assisting in combating the anti- sea erosion and minimized the loss to life and property. – The coastal data collection mechanism needs to be improved. Govt. of Gujarat may submit a list of vulnerable coastal sites to Coastal Erosion Directorate, CWC, New Delhi so that the same is included in the proposed Coastal Management Information System (CMIS). – The Rubble Mound Sea (RMS) wall at sites Dumas, Thitahl and Kolak-Udwada and the use of P.P Rope Gabion with retaining wall at site Danti-Jalalpore are found to be serving its purpose, however due to toe scouring and snking is reported in RMS wall. Cutting/ burning of ropes of Gabion wall by local people has led to its gradual deterioration.
• Observations Contd … – The use of P.P Rope Gabion found to be not suitable for the high wave condition as seen the sites inspected namely Onjal Machhivad and Nani-Danti- Moti Danti. Hence the implementation of the same design in future projects experiencing similar coastal environment would require serious review including maintenance issues. – Maintenance of the completed coastal protection structures needs to be paid due attention as per the “Manual for post construction maintenance and Participation of local beneficiary community in the maintenance of the executed measures needs to be explored. – Periodic survey and maintenance of the completed coatal protection structures needs to be paid due attention and ensuring holistic planning for anti-sea erosion measures is important to avoid shifting f problem from one reach to other.
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