cameroon gce advanced level water supply and drainage networks processes 2

cameroon gce advanced level water supply and drainage networks processes 2

cameroon gce advanced level water supply and drainage networks processes 2

SECTION I –WATER SUPPLY AND HYDRAULICS
1.1
Name two sources of fresh water. (2×0.50=1marks)
1.2
Define potabilisation. (2 marks)
1.3
Complete the table 1, by classifying the treatment given in the list below techniques by completing under the
different treatment phases of
potable water:
Treatment phases; Pre-treatment, Physico-chemical, softening, bacteriological,
Treatment techniques; reduction of hardness, coagulation, mechanical straining, flocculation, filtration on
rapid sand filters, precipitation of solid matters in suspension, sedimentation, PH-treatment,
oxidation(bleaching), chlorination.

Treatment techniques Treatment techniques
Pre-treatment
Physico-Chemical
Bacteriological
Softening

(10×0.50=5marks)
1.4
A water supply scheme is to be constructed in a school by MTN foundation as part of it civil social
responsibility. The school is entire a boarding school, with a student population of 2000 students and having
teaching /administrative staff strength of 100. The daily consumption per student is 100 l/s and that of the
teaching staff 50 l/s. 10% of the daily peak demand will be added for cleaning service and green spaces. The
scheme will be constructed from an industrial bore hole. Water will be pump from the bored hole to a semiburied concrete storage tank, constructed on the hill overlooking the school. Water will flow tank by gravity due
to the water head to the different draw off p

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