http://www.cgwb.gov.in/documents/RWH_GUIDE.pdf
manual on rain water harvesting Central ground water board
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web site for rain water harvesting
PROPOSAL FOR RECHARGE PIT :
For design consideration, rainfall intensity of 25 mm has to be taken into account
Considering four recharge pits,
Recharge Pit Size : 2 x 2 x 2.25 Mtr ; Filter material Depth = 0.9 mtr
Depth to water level in summer (Pre Monsoon)= 25 mtr bgl , Hence bore well depth should be atleast 25 mtr bgl
COST ESTIMATE OF WELL :
PIT SIZE : 2 x 2 x 2.25 mtr, 4 nos , Filter material Depth =0.9 mtr
| Sr No |
Work
Qty
Unit
Rate
Amount (Rs)
1
Excavation
9
cum
300/=
2700
2
PCC,0.10m thick at footing
0.2
cum
2700/=
540
3
B/W, 0.23 m thick
4.14
cum
2400/=
9936
4
Plaster(Inside)
18
Sq m
85/=
1530
5
Coarse sand ,2 mm size,0.3 mtr depth, as filter material in injection well
1.2
cum
1000/=
1200
6
Gravel, 5 mm size ,0.3 mtr depth, as filter material in injection well
1.2
cum
1000/=
1200
7
Boulder, 5 mm size, 0.3 mtr depth, as filter material in injection well
1.2
cum
1000/=
1200
8
Pea Gravel ,5 mm size ,between inwell bore and casing , volume=0.03 sq mtr x depth in mtr
0.75
cum
1200/=
900
9
RCC Cover over injection well pit,0.10 m thick
0.4
cum
4000/=
1600
10
Removal of debris
9
cum
200/=
1800
11
Inwell bore, 10 inch dia
25
mtr
800/=
20,000
12
Casing, 6 Inches, MS, Blind
15
mtr
650/=
9750
13
Casing, 6 Inches, MS, Slots
10
mtr
750/=
7500
14
MS pipe interconnecting to injection well pit, 4 inch dia
mtr
400/=
NA
15
MS pipe laying and fittings
mtr
300/=
NA
16
Development charges
LS
7,500/=
17
Pipe Lowering
LS
5000/=
18
Demolision by jack hammering for breaking the RCC floor for laying MS interconnecting pipes
Hourly
400/=
NA
19
Dwarf Wall, B/W, 0.23 mtr thick,0.5 mtr depth
cum
1550/=
NA
20
TOTAL
72356
21
PROFIT
%
20
14471
22
Overhead
%
10
7235
23
TOTAL
94062
24
ROUND OFF
95,000/=
25
NUMBERS
4
26
QUOTATION
3,80,000/=
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