Welcome to Construction of Open Space RWHS

Orientation

Critical Path Analysis

Project: Construction of Roadside and Open Space Rainwater Water

Harvesting Structures within the Coimbatore Municipal

Corporation Area

Work to be done:

Total no. of RWHS

Open Space

Roadside

215 130 85

Time frame : 4 months from December 1st 2009Distribution : Evenly in all 4 zones

Week 1 2 3 4 5 6 7 8 9 10 11 12

Open 3 15 40 70 100 130

Road side Cast slabs 10 20 30 42 54 66 78 85

Time frame for Critical Path

Open Space RWHS

A 6" ø Bore Hole90 m Depth

8'-0"[2.44]

A

P L A N

8'-0

" [2

.44]

Pebble for1'6" Depth

40 mm HB Jellyfor 3'6" Depth

Soling for3'00" Depth

6" ø Perforated casing Pipe 20' Depth

7" ø Casing Pipe for 20' Depth

S E C T I O N O N A A

Ground Level Ground Level

Depth of borehole is 90 m tomeet at least 2-3 fractures

2"[0

.05]

Material Required

• Soling stone : 4.67 cum (1.65 Unit)• 40 mm Metal : 4.98 cum (1.75 Unit)• Pebble : 2.13 cum (0.75 Unit)

Open Space Days

Drill & Erect casing pipe. Fix end cap, measure & note depths – Total, hard rock, Water struck with pressure (can be > 1) - Report data to office

1

Earth work Excavation for percolation pit : 8’ Dia and 8’ Depth of Circular pitBased on the soil formation depth and dia may vary

2

Arrange filter materials nearer to the pit (Soling, 40 mm Metal and Pebbles) 1

Fill the filter materials into percolation pit (Soling and 40 mm metal can be filled first then take water sample and measure static water level of the bore hole finally fill the pit with pebbles)

Collect data sheet, labeled can from office

1

Collect, can and label water sampleUse ball pen to write

Submit water sample for analysis

Remove excavated earth

Total No. of days Required 5

Rain Water Harvesting Structures (Open Space)

RWHSs (Open Space) with borewells, recharge pits with

filter material

One of the Model of RWHS at General Hospital, Coimbatore

RWHSs (On Roadside) with borewells, recharge pits and

filter media

Rain Water Harvesting Structures (On Road Side)

Useful HintsFilling materials quantity

– Soling stone : 4.67 cum– 40 mm Metal : 4.98 cum– Pebble : 2.13 cum

Plain casing pipe goes in first and perforated one stays on top – each pipe measures 20 feet

Helpline

Siruthuli office 98946 31551K. Mylswami 99947 22999G. Sampath 99521 33433P. Aruchami 90034 94430

Supervise construction activities Open Type

• Check for low lying areas where water logs • Drill & Erect casing pipe. Fix end cap • Measure the drilling depth (at the time of removing drill

rods – each rod measures 18.50 Feet)• Measure the length of casing pipe erected (both

perforated and plain)• Obtain drill logs –

- Yield of the bore ,- No of fracture zones,- Water struck depths

- Hard rock struck depth

Guidelines• Average depth of bore hole 90 meters • Plain casing pipe 6 mt at the bottom• Perforated casing pipe 6 mt at the top• Excavate earth for percolation pit • Record earth work measurements • Arrange for filter materials • Fill in the filter materials • Measure static water level• Collect water sample • Submit water sample for analysis• Report data to office • Remove excavated earth

Sl. No. 1 2 3 4 5

Name and Address of the Place

Elementary School, Ramalingam Colony

Elementary School, Ramalingam Colony

High School, Ramalingam Colony

Middle School, Kenwyn, MTP Road

Girls Higher Secondary School, R S Puram

Zone West  West West West West

Ward No. 53 53  53 49  

No. of Structures 1 1 1 1 1

Location

Near main gate inside the campus

Infront of the Northern side building

North-East Corner of the school campus

Infront of theSchool Building

Infront of theSchool Building

School Contact No.98422 311012304408

  94425 26474, 2458005

90033 23146 98941 881552540884

Details of Bore well

Date of Drilling 05.12.09 06.12.09 06.12.09 06.12.09  

Time of Drilling 9.30 PM 2.15 AM 7.15 AM 11.00 PM  

Total Depth 300 300 300 300  

Water struck Depths 175 & 270 Feet 160 Feet 175 & 290 Feet 142 & 276 Feet  

Hard Rock struck depths Feet Feet Feet Feet Feet

Casing pipe length - Plain 20 Feet 20 Feet 20 Feet    

Casing pipe length -Prerforated 20 Feet 20 Feet 20 Feet    

Reported Yield 1.5-2.5 Inches 1.5 Inches 1.0-1.0 Inches 1.5-1.5 Inches  

Static Water Level Feet Feet Feet Feet Feet

Water Quality

PH          

TDS          

COD          

BOD          

Analysis Result          

DATA SHEET for each Point

Discussion time

Please do clarify all your doubts now and

at anytime during execution

Thank you