Digital Signal Processing Reference
In-Depth Information
monitoring network but single studies were conducted during 1991, 2000, 2001, 2002, dealing with
different water quality parameters such as some hydrochemical parameters and some biological
parameters in the lake water, and the study of occurrence of humic substances in lake sediments.
5.6.
DATA SOURCES AND ANALYSIS
Assessing and managing water quality requires a huge amount of data to be collected. In order to
develop the water quality management information system, different types and categories of data are
needed to develop such a system. The following section identifies all the available and collected data
that are needed as inputs for developing the system components. The different data sets were collected
and analysed for the study watershed including the catchment area and the shallow lake. The different
categories of data were identified based on the required data needed to be included in the geo-
database, which is the main core of the information system.
Three different categories of data are identified here:
Digital maps and GIS layers
,
different attribute
data collected from available sources
and from field work
,
satellite images and remote sensing data
.
The collected data is divided into two sets:
Secondary and primary data sets
. The
Secondary data sets
are the data gathered from different sources such as databases, reports and documents and accounts of
previous work done. Most secondary data were obtained from reports and databases from
governmental institutions and agencies. Where
there was a gap in the secondary data,
primary data set
collection was undertaken mainly through field work. The objective of the primary data survey and
collection
was to fill in the data gaps in the secondary data sets.
5.6.1.
Data Inventory
The different types of data that is needed from both the secondary and primary data collection, to feed
the surface water quality geo-database includes: Flow rates in main drains, pumping station data, water
levels, water quality data, tidal variations, meteorological data (wind - evaporation rates - solar
radiation - humidity - temperatures), ground water boreholes, demographic data and population rates,
geometric data and cross sections of drains, digital maps and GIS layers of the catchment and the lake
areas, bathymetric maps of the lake with different resolutions, satellite images of different types and
resolutions, water samples at certain locations in the catchment and lake, water quality field
spectrometry readings. The collected data were grouped according to their properties into data sets that
are shown in
table (5-1)
which shows the first level of data collection (
Secondary collected data
).
Secondary Data Sets
The secondary data sets include all types of needed data for the development of the water quality
management information system geo-database. The following section gives an explanation of different
types of collected data.
A.
Hydrodynamic data sets
This data set includes the discharges and flow rates from the main drains in the drainage catchment.
The flow rates were given at each of the pumping station existing on the main and secondary drains in
the catchment. A number of 6 pumping stations exists on the main drain Edko and discharges water to
the main drain, and one pumping station exists on the other main drain in the catchment, barseek drain.
Average hourly discharges of these pumping stations are recorded and used in the development of the
hydrodynamic models components.
Table (5-2)
shows the maximum flows from the six pumping
stations to Edko drain along with the permissible maximum water level at each station.
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