The identified drains in the defined stretch – from Kakarapar barrage to ONGC Bridge falls under the jurisdiction of Government of Gujarat, Surat Municipal Corporation and Surat Urban Development Authority. Decentralized system has been proposed based on the zoning of the River Tapi stretch depending on the jurisdiction.
The areas under the jurisdiction of Surat Municipal Corporation already have comprehensive sewerage system.
For the drains that fall in this region, it is proposed to intercept and divert the drains and pump it to existing Sewage Treatment Plants for further treatment wherever possible via existing Sewage Pumping Stations and where there does not exist a Sewage Pumping Station, new Pumping Stations have been proposed.
The region under Surat Urban Development Authority do not possess any sanitary system. It is a highly developing region in terms of population and area.
. In these regions, it is proposed to provide comprehensive sewerage system in developed areas. For the drains like Varachha and Valak, it is proposed to intercept and divert the drains to proposed Sewage Treatment Plants and ultimately dispose it in the River Tapi.
The area under the jurisdiction of Government of Gujarat, there do not exists any sanitary system except in Kadod and Mandvi which shows urban development. Rest of the regions are rural areas where the sewage generated finds its way to River Tapi, degrading the River Water Quality. Considering the existing scenario, it is proposed that all the villages that exist near the bank of the river, shall be provided with comprehensive sewerage system.
For the villages the that are far off the river bank but discharges the sewage into the drain that finds way to River Tapi, the drain shall be intercepted and diverted to a proposed Sewage Treatment Plant. The treated sewage in this region shall be reused for irrigation purposes as there exists many farms nearby.
In brief, it can be said that significant habitable areas are proposed to provide comprehensive sewerage system and where the current population density is low, interception and diversion options have been proposed. Where there were existing Sewage Pumping Stations and Sewage Treatment Plants, the intercepted and diverted flow was transmitted to the existing SPS and STP. New Sewage Pumping Stations and Sewage Treatment Plants have been proposed where there were no existing SPS and STP. The Sewage Treatment Plants that shall dispose its sewage into River Tapi after treatment shall be tertiary treated and rest shall be secondary treated.