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Chapter V Drainage System in Chennai Metropolitan Area

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Chapter V Drainage System in Chennai Metropolitan Area CHAPTER V DRAINAGE SYSTEM IN CHENNAI METROPOLITAN AREA Pappan channel, Tambaram CHAPTER V DRAINAGE SYSTEM IN CHENNAI METROPOLITAN AREA 5.1 Flood protection works The National Water Policy recommends that water resource development and management has to be done for a hydrological unit such as a drainage basin as a whole, or for a sub-basin. The approach needs to address not only irrigation but other requirements such as, domestic, industrial, energy, recreational and other uses as well. The importance of planning any project within broad framework of river basin master plan has been, therefore, amply emphasised. Improvements to macro and micro drainages1 are, therefore, vital to address the challenges of flooding. The macro drainage works are executed by Water Resources Department (WRD) and the micro drainage works are executed by Greater Chennai Corporation (GCC) and respective local bodies. With a view to mitigate flooding in Chennai city due to frequent heavy rains, after the floods of 2005, WRD proposed to carryout flood protection works under the centrally sponsored scheme of JNNURM. As JNNURM works were related to urban areas, the preparation of Detailed Project Report (DPR) was entrusted to GCC to provide solution for the inundation problems of Chennai city. The DPRs were prepared in 2008-09. GoTN accorded (October 2009) administrative sanction for improvement to macro drainages maintained by WRD in the four basins2 of Chennai at a cost of ` 633.03 crore using JNNURM funds (35 per cent) and State funds (65 per cent). The works were to be executed in 10 packages. The works in seven packages were awarded between June 2010 and April 2011 to various contractors. The C&AG’s Audit Report on GoTN (Economic Sector) for the year ended 2012-13 had pointed out that these works were not completed due to improper planning, non-acquisition of land, lack of co-ordination with other departments, and non-eviction of encroachments. We observed that these issues continued to persist and consequently, the works were getting delayed as discussed in the following paragraphs. Works in three other packages were not commenced due to non-removal of encroachments in waterways by WRD, where such works were required to be carried out. 1 Rivers and canals, under the control of WRD, constitute macro drainages and storm water drains under the control of GCC, constitute micro drainages 2 Northern Basin (Ambattur, Kathirvedu, Korattur and Otteri); Central Basin (Arumbakkam, Koyambedu, Maduravoil and Virugambakkam); Eastern Basin (Adyar, Ice House, Mandaveli, Muttukadu, Mylapore, Triplicane and Wall Tax Road) and Southern Basin (Manapakkam, Pallikaranai, Porur, Ram Nagar, Taramani and Velachery) 63 Performance Audit of ‘Flood management and response in Chennai and its suburban areas’ While implementing the seven packages awarded in 2010-11, WRD faced constraints in the DPR prepared in 2008-09 such as low soil bearing capacity of the work site, need for changing the construction methodology, non-availability of land due to encroachments, non-feasibility of the proposed alignment, etc. Therefore, WRD prepared (September 2012) a revised DPR for executing the work in all the ten packages including in the seven packages which were awarded, but faced various constraints in implementation. The revised DPR was approved by GoI, Ministry of Urban Development in December 2012. After approval of the DPR by GoI in December 2012, and subsequent approval by Technical Advisory Committee and Tender Award Committee, GoTN accorded (September 2014) Revised Administrative Sanction for the ten packages at a total cost of ` 699.86 crore. We observed from the fact that the works could not be carried out based on the DPR of 2008-09, which indicated that the DPR was defective, warranting a revised DPR and the consequent delay in implementation of the works. As of March 2016, three out of the ten packages were successfully completed. Deficiencies in the execution of the remaining packages, contributing to non-achievement of objectives of these works despite incurring an expenditure of ` 274.05 crore, are discussed in Paragraphs 5.1.1 to 5.1.8. Northern Basin 5.1.1 Work not completed due to non-completion of land acquisition despite directive by the Hon’ble Supreme Court to acquire remaining land GoTN sanctioned (October 2009) construction of a diversion channel for carrying 300 cusec of surplus water from Kolathur Tank to Madhavaram Tank to reduce inundation in adjoining areas due to overflowing of Kolathur Tank’s surplus course. The work of creation of the channel for 1,830 m out of 3,150 m was completed by incurring an expenditure of ` 13.92 crore. The balance work of creation of channel for 1,320 m was not executed due to legal proceedings in the acquisition of land and the partly executed work was closed by WRD (July 2015). We observed that the legal appeal filed by the land owners was disposed of (September 2014) by the Hon’ble Supreme Court of India with direction to GoTN to start land acquisition process afresh. But, WRD without taking any initiative to acquire the land, closed the work in July 2015, ten months after the Hon’ble Supreme Court’s direction. This lackadaisical approach of WRD had resulted in non-achievement of the objective of constructing diversion channel from Kolathur Tank to Madhavaram Tank and thus, the expenditure of ` 13.92 crore incurred on the partial work proved unfruitful. Non- completion of the channel resulted in inundation of nearby areas of Thanikachalam Nagar of Kolathur during the December 2015 floods. 64 Chapter V – Drainage System in Chennai Metropolitan Area GoTN replied (February 2017) that efforts would be made to complete the land acquisition. The reply was not tenable as GoTN had not initiated any action even after a lapse of three years since the judgement of the Hon’ble Supreme Court allowing fresh land acquisition. Thus, there is need for GoTN to complete the work after ensuring acquisition of remaining land as per directives of the Hon’ble Supreme Court for achieving the intended objective of the work. 5.1.2 Failure to create additional vent resulted in afflux of water GoTN sanctioned (October 2009) the work of improvements to Ambattur Tank surplus drainage channel to mitigate inundation in Ambattur industrial area of North Chennai by discharging 1,830 cusec of surplus water from Ambattur Tank to Korattur Tank. The works included construction of weirs at left and right flank, flood protection walls, bridge etc. We had observed 3 that the work could not be fully completed even after incurring an expenditure of ` 18.68 crore due to non-receipt of permission for provision of additional vent for transferring 570 cusec under the Railway track considering the safety of the tracks. We also observed from the scrutiny of records that no efforts were made by WRD for redesigning the vents in accordance with the safety requirements of the Railways but pre-closed the execution of work (March 2015). This resulted in non-achievement of the objective of transferring 570 cusec of water and continued inundation and flooding in Ambattur and SIDCO industrial areas. Thus, failure of WRD to commence the work after obtaining necessary permissions or to initiate efforts for redesigning the vents in accordance with the requirement of railways resulted in non-achievement of desired objective, besides unfruitful expenditure of ` 18.68 crore. 5.1.3 Unfruitful expenditure on partially executed surplus channel work Para 100 of Public Works Department (PWD) Code envisaged that no estimates should be prepared for any work except on the basis of a detailed investigation on the site. Para 180 also stipulated that no work should be started on land which was not duly handed over. (A) Korattur Tank having capacity of 0.236 TMC is situated in Ambattur taluk, Tiruvallur District. The tank had a defined surplus course only for a length of 1,750 m. Thereafter, it spreads over and takes a natural course for a length of 1,290 m., passing through patta lands before falling into Madhavaram Tank. In 2010, the National Highways Authority of India (NHAI) proposed construction of Chennai bypass road, with its alignment cutting across the surplus course of Korattur Tank. During commencement of the work on the bypass road, NHAI had proposed (February 2010) for 3 Paragraph 2.13.4 of C&AG’s Audit Report (Economic Sector), GoTN for the year 2012-13 65 Performance Audit of ‘Flood management and response in Chennai and its suburban areas’ construction of a drain along the service road for taking the Korattur Tank’s surplus water to Madhavaram Tank (Exhibit 5.1). The proposal was discussed by NHAI and WRD authorities, and it was suggested by WRD for construction of box culverts at two locations to carry surplus water across the road to its natural drains. WRD had not agreed to the NHAI proposal of construction of a drain along service road. NHAI had completed (2011) Chennai Bypass road and service road with box culverts at two locations as suggested by WRD. Exhibit 5.1: Illustrative sketch showing existing and proposed alignment of Korattur Tank’s surplus course Not to scale The bypass road work was completed with box culvert underneath the road to carry the surplus water of Korattur Tank, instead of constructing a drain along the service road as was suggested by NHAI. After crossing the bypass road through box culverts, the surplus water took natural course over the patta lands, thereby contributing to inundation in adjoining areas. The failure of WRD to agree to the proposal of NHAI resulted in continued flow of the surplus water through thickly populated areas contributing to the inundation in the adjoining areas.
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