Discharging Excess Treated STP Water into Lakes, Shallow Recharge

Structures, New Ponds

RESPONSIBLY

KSPCB and Citizens' Dialogue

15 Lakes around Sarjapura Road

● Total Watershed Area ~ 33 sq km ( ~ 8000 acres)

● Total Water Spread Area ~ 428 acres (not including Bellandur lake)

● Volume ~ 1731 million litres (average 1m depth)

● Evaporation loss ~ 2597 million litres (1.5 m annual)

● Percolation ~ 6231 million litres (10mm per day, 3.6m annual)

S No Lake Name Area (hectares)

1 Chikka Ambalipura 2.9

2 Dodda Ambalipura 5.47

3 Iblur 7.3

4 Parappana Agrahara 7

5 Dodda Kudlu 18

6 Chikka Kudlu 4.5

7 Haralur 9.58

8 Kasavanahalli 21

9 KaikondrahalliSaul

18

10 Saul 25

11 Hado Siddapura

12 Halanayakanahalli 17

13 Doddakanneli 9

14 Devarabisanahalli 4.64

15 Junasandra 4.67

Lake Classification (as per CPCB)

Legend

Class 'A' Drinking water source without conventional treatment but after disinfection

Class 'B' Outdoor bathing organized

Class 'C' Drinking water source with conventional treatment followed by disinfection

Class 'D' Propagation of wildlife, fisheries

Class 'E' Irrigation, industrial cooling, controlled waste disposal

Primary Water Quality Criteria for various uses laid down by Central pollution Control Board

Artificial Recharge Volume

● Minimum 600 structures

● Minimum 2.6ML of static volume

● Catchment of < 500 acres

* Data from surveys

8.5 MLD: STP (at least 50% excess treated water)

ZERO DISCHARGE

● CFE / CFO● Treated STP water used for landscaping +

flushing● No dual plumbing in older apartments for flushing

reuse● Disposal of excess treated waste water through

honeysuckers● Discharge out of the campus

Water Reuse – Options explored

● Watering of Saplings in common areas – expensive, difficult to manage

● Reuse as Domestic Water – TZED● Others ?

STP Water Test Report

Excess treated water of good quality

● Artificial Recharge : SJR Verity, Rainbow Drive● Saul kere : BREN Celestia, Corporates● Upper Ambalipura, Kasavanahalli : OZONE

Evergreens (100KLPD)● Lower Ambalipura : SJR Redwoods (80 KLPD) ,

Trinity Woods and Acres (new STP being setup)● Etc.

Questions

What can be KSPCB, Citizens' role ?

THANK YOU !!

Questions - 1

● Which are the specific water quality parameters that should be monitored and at what frequency?

● What are the acceptable values?● Would any specific person/organization be given the task of

monitoring these values?● What would be the process for deciding the volume of sewage

that can be let into the lake?● Would this specific person/organization be empowered to keep

people from dumping untreated waste water into the lakes/wells? What would be the process or who would be the person that they can escalate/discuss issues with?

● Would KSPCB play this role?● What will be KSPCB’s role in this option?

Questions - 2

● Which are the lakes that are currently experimenting with this option?

● What level of treatment, type of treatment (natural/conventional), water quality parameters is expected for disposing the water into lakes, for groundwater application, etc.?

● For Apartment complexes that do not have an STP. What is the enforcement mechanism and how do we make sure everybody follows the law?

● Does KSPCB recognize the natural treatment systems like SBT, DEWATS?

Phytorid STP

Herohalli

Herohalli

Lalbagh

Weather Station