. /.WORLD TRADE
ORGANIZATIONG/TBT/Notif.00/294/Add.3
3 December 2002
(02-6651)
Committee on Technical Barriers to Trade Original:  Spanish
NOTIFICATION
Addendum
The following communication from Colombia is being circulated in accordance with
Article 10.6.
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The Republic of Colombia has amended Articles 86 and 210 of Resolution No. 1096 of 2000
adopting the Technical Regulations for the Drinking Water and Basic Sanitation Sector, notified in
document G/TBT/Notif.00/294 of 30 June 2000, as i ndicated in the following draft Resolution:
ARTICLE 1 - Article 210 shall be amended and the definition of Macromeasurement
changed to read as follows: "A series of activities and resources which enable values and statistics to
be established for any hydraulic measurement which defines the operating strategy for a water supply
or sewerage system. Hydraulic measurements include the measurement of flow, volume and levels,
inter alia ."
ARTICLE 2 - The following definitions shall be added to Article 210:
1. Macromeasurement devices :  Meters installed in one or several of the various parts of water
supply systems: catchments, treatment plant and pumping plant entry and exit points, storage tanks,
strategic geographical sectors of a distribution system, inter alia .
2. Flow meters :  For the purpose of these Technical Regulations, instruments which establish
the volume of water per unit time flowing through a water supply or sewerage system structure or
from a water source.
3. Pressure meters :  Instruments which establish the internal hydraulic pressure of water supply
pipes.
4. Level meters : Instruments which measure the difference in the depth of the water-bearing
stratum in relation to a point or horizontal plane and which enable the volume of water from the
water-bearing stratum deposited in storage tanks and the volume of flow from the water-bearing
stratum in channels and at control points to be calculated.
ARTICLE 3 - Article 86 shall be amended to read as follows:ARTICLE 86 - MACROMEASUREMENT . In view of the fact that the volume, pressure
and levels of the drinking water distribution system are important parameters which have to be taken
into consideration in the water distribution balance, operating and maintenance work and future
planning, macromeasurement devices shall be installed to obtain data on actual supply.G/TBT/Notif.00/294/Add.3
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Macromeasurement shall be conducted for all water supply systems, irrespective of their
degree of sophistication, in accordance with the following criteria:
1. Catchment. Hydraulic measurements shall be taken at surface water or groundwater
catchment points and recorded in a logbook or magnetic file.
2. Macromeasurement devices shall be installed at treatment system entry points and the volume
of flow entering the system recorded in a logbook or magnetic file at least once at the beginning of
each operating shift.
3. Macromeasurement devices shall be installed at treatment plant exit points and the volume of
treated water supplied recorded in a logbook or magnetic file at least once at the beginning of each
operating shift.
4. In cases where the distribution network is operated by different firms, macromeasurement
devices shall be installed at the entry point to each section of the network and the data entered in alogbook or magnetic file to record the amount of water supplied to each.
5. Meters which enable the water level to be measured at any time shall be installed in storage
and/or buffer/surge tanks.
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