PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

19.4 Information to the Bidders to work out the system.
1. (a) Liquid : Water of Umiew Dam reservoir containing silica,
sand and suspended and colloidal particles (turbidity
upto 1500 NTU)
(b) Temperature : Approximate 7°C to 25°C
2. Levels:
(c) Specific gravity : To be considered 1.025
(d) P H value : 6.5 to 7.5
(a) HWL in the range of operation (at which the
pumps shall be operated in rare occasion during
monsoon within the range of operation)
(b) Conservation level of the reservoir/normal HWL
(at which, the pumps shall be operated mostly
during monsoon)
(c) Low water level (LWL) in the range of operation
(at which the pumps shall be operated mostly in
the dry season)
(d) Centre of lower Intake Port level within the
range of operation (duty point)
: 1580.00 m
: 1577.00 m
: 1562.00 m
: 1567.00 m
(e) Center of upper intake port level : 1575.00 m
(f) Dead storage level of the reservoir. : 1562.00 m
(g) Pump house deck /approach bridge level
(Proposed).
: 1985.60 m
(h) Discharge in gallery : 1583.20 m
(i) Ground level at intermediate stage pumping
station.
(j) Maximum E.L. of rising main C/L in the pipe
alignment route
: 1661.00 m
: 1661.00 m
(k) R.L. at point of discharge : 1664.00 m
3. a) Length of the approach bridge upto the Bank of
the reservoir
b) Length of the rising main upto intermediate
pumping station.
: 40m
: 750m
4. Dia. of the rising main : 500mm
Delivery manifold : Common Header (500mm)
x individual pump branch
(300mm)
DTS : Detailed Tender Specification. Page 186