the CPDAC Sub-Committee on Performance Evaluation of Coastal - - PowerPoint PPT Presentation

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

• f Coastal Protection Works
• During the 6th meeting of CPDAC meeting held at Puduchery
• n 7th 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 17th 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

• f 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

• f Coastal Protection Works

Re-Constitution of this Sub-Committee in 2011 based on the decision of the 12th CPDAC meeting held at Bhubaneswar during 3rd &4th 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

• f Coastal Protection Works

Re-Constitution of this Sub-Committee in 2012 based on the decision of the 13th CPDAC meeting held at Mangalore during 9th & 10th 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

• f Coastal Protection Works

Sl.No Meeting Details Dates of the meeting State/UT and venue

• f 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 & 18/10/2005 Goa 4 Fourth 06th to 08th /01/2011 Lakshadweep/ Kavaratti 5 Fifth 26th to 28th/07/2011 Tamil Nadu/ Chennai 6 Sixth 18th & 19th June-2015 Gujarat/Surat

Members present in the 6th Meeting of the CPDAC sub committee on Performance Evaluation of Coastal Protection Works held on 18th &19th 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

Zone Accretion length (km) Erosion length (km) Stable length (km) Total length (km) South Gujarat 8.02 146.21 4.73 158.96 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

SAC-CWC-Study- using Satellite data of 1989-91 and 2004-06 time frame

• n 1: 25,000 Scale

Study Area- South Gujarat Coast

District Accretion length (km) Erosion length (km) Stable length (km) Total length (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 18th & 19th 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

19th 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

• ther.