Settling Characteristics of Kubanni Dam Water
Settling Characteristics of Kubanni Dam Water
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Date
1990-01
Authors
Lebura, Siedoma
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Abstract
This study investigates the settling characteristics
of the raw water of Kubanni Dam at the main campus of
Ahmadu Bello University, Zaria. The investigation
included plain sedimentation and sedimentation of coagulated
water samples using aluminium sulphate (alum) as
coagulant. Coagulation and flocculation tests were
performed by the batch method in beakers (Jar tests),
while the sedimentation tests were performed using
settling column.
The results obtained indicate that plain sedimentation
is not adequate for the turbidity removal from the
raw water of the dam, but coagulation and flocculation
processes are necessary, An optimum alum dose of 50mg/L
is required to coagulate the water during the dry season
and 70mg/L during the rainy season. An average turbidity
removal of 85.596 was obtained from the sedimentation of
the coagulated water samples as compared to 26% obtained
from the plain sedimentation of the water samples.
Data from the settling of the coagulated water
samples are used to design new sedimentation basins and
for up-grading the existing sedimentation basins of the
University water works. Four rectangular tank units are
suggested, each of dimensions 21m x 5.5m with effective
depth of 3m. Also four circular tanks could be used each
of diameter 12m and effective depth of 3m. Using the
experimental data the existing four basins (square in plan-
8.5 x 8.5m and effective depth of 5m) are up-graded by
- viadjusting
the volumetric flow rate. Two additional
basins are recommends to achieve turbidity removal of
85.5% instead of the 70% removal being achieved presently.
The structural design of the basins and the estimated
cost are also presented.
Description
A thesis Submitted to the Postgraduate
School, Ahmadu Bello University, Zaria,
in Partial Fulfillment of the Requirement
for the Award of MASTER OF SCIENCE
degree (Water Resources and Environmental
Engineering).
Department of Water Resources and
Environmental Engineering, Ahmadu Bello
University, Zaria, Nigeria.
January, 1990
Keywords
Characteristics,, Kubanni,, Dam Water