GROUND WATER INFORMATION BOOKLET - CGWB

1 GOVERNMENT OF INDIA. MINISTRY OF WATER RESOURCES. CENTRAL GROUND WATER BOARD. GROUND WATER INFORMATION BOOKLET . BANGALORE URBAN DISTRICT, KARNATAKA. SOUTH WESTERN REGION. BANGALORE. MARCH 2013. 1. Foreword Groundwater is an essential component of the environment and economy. It sustains the flow in our rivers and plays an important role in maintaining the fragile ecosystems. The groundwater dependence of agrarian states like Karnataka is high. Recent studies indicate that 26 percent of the area of Karnataka State is under over exploited category and number of blocks is under critical category. In view of the growing concerns of sustainability of GROUND WATER sources, immediate attention is required to augment groundwater resources in stressed areas.

2 Irrigated agriculture in the state is putting additional stress on the groundwater system and needs proper management of the resources. Central GROUND WATER Board is providing all technical input for effective management of GROUND WATER resources in the state. The groundwater scenario compiled on administrative divisions gives a better perspective for planning various GROUND WATER management measures by local administrative bodies. With this objective, Central GROUND WATER Board is publishing the revised groundwater INFORMATION BOOKLET for all the districts of the state. I do appreciate the efforts of Dr. , Regional Director and his fleet of dedicated Scientists of South Western Region, Bangalore for bringing out this BOOKLET .

3 I am sure these brochures will provide a portrait of the groundwater resources in each district for planning effective management measures by the administrators, planners and the stake holders. Sushil Gupta Chairman 2. PREFACE. GROUND WATER contributes to about eighty percent of the drinking WATER requirements in the rural areas, fifty percent of the urban WATER requirements and more than fifty percent of the irrigation requirements of the nation. Central GROUND WATER Board has decided to bring out district level GROUND WATER INFORMATION booklets highlighting the GROUND WATER scenario, its resource potential, quality aspects, recharge discharge relationship, etc.

4 , for all the districts of the country. As part of this, Central GROUND WATER Board, South Western Region, Bangalore, is preparing such booklets for all the 30 districts of Karnataka state. The Bangalore Urban district GROUND WATER INFORMATION BOOKLET has been prepared based on the INFORMATION available and data collected from various state and central government organisations by scientists of Central GROUND WATER Board with utmost care and dedication. This BOOKLET has been prepared by Dr. Sooryanarayana, Scientist D under the able guidance of Dr. K. Md. Najeeb, Regional Director, Central GROUND WATER Board, South Western Region, Bangalore. The figures were prepared by , Assistant Hydrogeologist and the hydrology data has been provided by Sri.

5 , Scientist-C. The efforts of Report processing section in finalising and bringing out the report are commendable. I take this opportunity to congratulate them for the diligent and careful compilation and observation in the form of this BOOKLET , which will certainly serve as a guiding document for further work and help the planners, administrators, hydro geologists and other engineers to plan the WATER resources management in a better way in the district. (Dr. K. Md. Najeeb). Regional Director 3. BANGALORE URBAN DISTRICT AT A GLANCE. SL ITEMS STATISTICS. NO. 1 GENERAL INFORMATION . i) Geographical area 2190 ii) Number of tehsils/ blocks/ taluks Four taluks Bangalore North, Bangalore East, Bangalore South and Anekal iii) Number of Panchayats/villages 122/699.

6 Iv) Total Population 95,88910. v) Average annual Rainfall 1049 mm 2 GEOMORPHOLOGY. Major physiographic units Rocky upland Plateau and Flat topped hills Major drainages Cauvery and Ponnaiyar basins 3 LAND USE (sq km). a) Forest area b) Net area sown 4 MAJOR SOIL TYPES Red loamy and sandy soil and laterite soil. 5 IRRIGATION BY DIFFERENT SOURCES (No.). Dug wells 628 dug wells Tube wells/Bore wells 12756 wells Tanks/Ponds 517 structures Net irrigated area sq km 6 NUMBER OF GROUND WATER MONITORING WELLS OF CGWB. (AS ON ). No. of Dug wells 22. No. of Piezometers 13. 7 PREDOMINANT GEOLOGICAL Granite Gneiss FORMATIONS. 8 HYDROGEOLOGY. Major WATER bearing formations Granite Gneiss Premonsoon depth to WATER The depth ranges from 5 -30 mbgl.

7 Level of piezometer during 2011. Post monsoon depth to WATER The depth ranges from 2m bgl to 40 m bgl level of piezometer during 2011. Long term WATER level trend in Rise ( to ) m 10 years (2002-2011) Fall ( to ) m 9 GROUND WATER EXPLORATION BY CGWB (AS ON ). No. of wells drilled( EW, OW, PZ, SH- EW-12, OW-09, PZ-20. Total) Total- 34. Depth Range - mbgl Storativity to 4. Transmissivity to 280m2/day 10 GROUND WATER quality . Presence of chemical constituents Presence of nitrate and fluoride in pockets. more than permissible limit (EC, F, AS, Fe, No3). Type of WATER Sodium Chloride type 11 DYNAMIC GROUND WATER RESOURCES (2009) IN HAM. annual replenishable GROUND WATER 11723.

8 Resources Gross annual GROUND WATER draft 16703. Projected demand for domestic and 3794. industrial uses 12 AWARENESS & TRAINING ACTIVITY. Mass Awareness programme 01. organized Date - Place- Kendriya Vidyalaya, Malleswaram participants-900. WATER Management Training 02. Programme 1) Date (Rain WATER Harvesting). Place- Kendriya Sadan, Bangalore No. of participants-40. 2) Date - 3rd &4th February 2005. Place- PSTI, Bangalore No. of participants-40. 13 EFFORTS OF ARTIFICIAL RECHARGE & RAIN WATER HARVESTING. Projects completed by CGWB (NO. Bangalore university Phase I & II under and Amount spent) central sector scheme Total amount spent- Rs. 46 lakhs.

9 Projects under technical guidance of 4 schemes under Freshwater year activity CGWB ( ) during 2003. 1) BDA Complex 2) IIHR Hesaraghatta 3) Raj Bhawan 4) APTS/PDMS. Total amount spent- lakhs 14 GROUND WATER CONTROL & REGULATION. No. of OE blocks 04. No. of Critical Blocks - No. of Blocks notified 04. 15 MAJOR GROUND WATER Deterioration of GROUND WATER quality PROBLEMS AND ISSUES due to industrial and sewage pollution and unscientific disposal of waste High Nitrate content in GROUND WATER Over exploitation of GROUND WATER resources 5. BANGALORE URBAN DISTRICT. INTRODUCTION: In the year 1986, Bangalore district was divided into Bangalore Urban and Bangalore rural districts.

10 The Bangalore urban district comprises of four taluks and within it lies the Bangalore city -the capital of Karnataka. It is the central point for running the state administration and is now known as Bruhat Bangalore Mahanagare Palike (BBMP). Bangalore is the sixth largest city of India and one of the fastest growing cities of Asia. It has acquired the name of Silicon City , due to its progressive trend in INFORMATION technology Now, after the IT boom, Bangalore city has suddenly overgrown its size and the district administration is facing a challenging task for providing necessary infrastructures to the related economic activities, trade, commerce and housing facilities.