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SWERAGE SYSTEM

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Sewerage System

The sewage generation is approximately assumed to be 80% – 90 % of total net water supply has been considered excluding water infiltration. Refer table below for phase-wise sewage generation in Naya Raipur.

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Considering the topography, the project area is proposed to be divided into six zones, each of which is proposed to have an independent sewer network & Sewage Treatment Plant. The overall sewerage system is proposed as follows:

Zone 1:

The zone is proposed to cater for 18 % of the total sewage generated in the project area, with proposed STP 1 located in Theme Park/Nature Resort. This zone includes Logistic hub, proposed railway station, Industrial area, Natural resort and Theme park, Integrated Freight complex and Residential area.

Zone 2:

The zone is proposed to cater for 10 % of the total sewage generated in the project area, with proposed STP 2 located near cantonment area. This zone includes Army, Sports village, NCC and Police academy, Cantonment area, International CricketStadium, Residential area, Health Complex, Facility complex, Education Complex and Commercial cum Business Complex.

Zone 3:

The zone is proposed to cater for 18 % of the total sewage generated in the project area, with proposed STP 3 located near Kotrabhata. This zone includes Residential area, Health Complex, Facility complex, Specialty Hospital and Commercial cum Business Complex.

Zone 4:

The zone is proposed to cater for 21 % of the total sewage generated in the project area, with proposed STP 4 located near Capital Complex. This zone includes Capital complex, HOD Buildings, Naya Rakhi Rehabilitation, Residential areas, Health Complex, Facility complex, Education Complex, Commercial cum Business Complex, Golf course and Botanical park.

Zone 5:

The zone is proposed to cater for 15 % of the total sewage generated in the project area, with proposed STP 5 located in Central Park. This zone includes Special industry zone (Gems and Jewelry park and IT SEZ), CBD area, Socio Cultural area, Hotel Complex and Central Green park.

Zone 6:

The zone is proposed to cater for 18 % of the total sewage generated in the project area, with proposed STP 6 located near Central Park. This zone includes Residential area, Institutional and Research area, University Complex and Knowledge park.

The Length of sewerage collection network is 80528m. Diameter of sewerage collection system ranges between 200 mm to 800 mm & the material proposed is HDPE.

Sewage Treatment

Sewage Treatment shall be done through Swage Treatment Plant. The treatment based on Sequential Batch Reactor (SBR) to be adopted.

Six STPs of total 91.70 MLD capacities are proposed for Naya Raipur. The STPs shall be developed in modules in three phases.

Capacity of STP at different phase of development

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Disposal Option

The Treated Sewage Effluent shall be utilized in any of the following uses so as to conserver and minimize the overall water requirement viz., land scaping, flushing and fire fighting. The Treated Sewage Effluent shall also be supplied to bulk industrial customers by pumping. The pipe material used for ring main is HDPE.

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AVAILABILITY OF WATER RESOURCES
Following surface water resources are available in the surrounding area
of Naya Raipur :
1. River Kharoon 2.River Mahanadi
River Kharoon
This was also a consideration being at almost equal distance but the
river is not perennial and already catering the need of Raipur city
supplemented by Ravishanker reservoir and hence can not be
considered as a dependable source of Water Supply for this Project.
River Mahanadi
River Mahanadi being perennial in nature is also reinforced with
water from Pairi and Sukha and has the capacity to discharge the
requisite amount of water for the proposed Naya Raipur. Hence it is
decided to construct an anicut across river mahanadi near Village
Tila, about 25 kms from the proposed capital city.
The state water utilization committee under chairmanship of the Chief  Secretary, Government of Chhattisgarh has given his consent vide letter  No. 5013/13/WRD/TS/IWS/01/D-4/Raipur dated 05/9/2006, to reserve 1.80  TMC of water, for water supply of proposed new capital of Chhattisgarh
state, for the year 2040 for the excepted population of 5.45 lakhs. Copy of
the said letter is annexured.
The Water resources department has already proposed an Anicut on  Mahanadi river for water supply to Naya Raipur city hence the
construction of an Anicut shall not be required under this project to fulfill
the intermediate need. It is proposed to construct an Anicut on upstream
side of Tila village ( i.e. Raur) which will also be constructed by
WRD for further requirement of Naya Raipur city.
PROPOSED COMPONENTS FOR WATER SUPPLY PROJECT
It is proposed to construct Intake well of 16 m Dia to be constructed on  the left bank of Mahanadi river on approximately 300 m up stream of  proposed.Anicut near village TILA( to be constructed by WRD under  state plan) with pump house to accommodate raw water pumps. The  power would be made available by constructing indoor electric sub  station of 2000 KVA near the pumping station. Then it is proposed to  convey the raw water by a raw water pumping main of 1000 mm Dia
mild steel pipeline 23.00 km in length to the conventional water
treatment plant of 52 mld capacity against a demand of 77 mld, near
village Pacheda inside the area of Naya Raipur. The clear water
pumping station with indoor electric sub station of 750 KVA shall be
erected near the water treatment plant to fulfill the demand of
intermediate stage year 2026. The treated water thus would be
conveyed to 29 nos. under ground service reservoirs located at various
sectors in the capital city by means of clear water pumping main &
clear water gravity mains. The entrepreneurs would then lift the water
for distribution purpose from UGR’s to the respective sectors that they
would be developing with complete infrastructure.
The above components are elaborated in detail as below:
Preliminary Survey  The preliminary survey has been
carried out from head works to water treatment plant and to other
required destinations including taking levels cross sections at nodal and  salient points. Details of the survey have been plotted and L-section  and lay out plan have been prepared. For network of clear water  pumping main & UGR’s the contour map of, NRDA has been referred.
No any amount has been approved under this item by CPHEEO while  appraising the water supply project.
RCC Anicut  The Anicut will be constructed by Water Resources Department near  village Tila across mahanadi river.The length of the proposed  anicut will be 11 m
and 3.60 m in height. The salient features as proposed by WRD are given in

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