Catchment Modelling Research Paper 2022

CATCHMENT MODELLING
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CATCHMENT DETAILS:
The Balckwattle Bay catchment is located in the inner suburb of the city of Sydney. This
catchment area is about 315 ha which drains its water into the catchment for Blackwattle Bay.
Another section of this catchment area is draining Sydney water ́s main stalk drainage system
that is used to make the water flow in the upper region of the catchment. This flood ́s reliability
is linked to the sloping nature of the land. Blackwattle is steeper at the upper section of the
catchment, it undulant in the middle part of the catchment but it is also flat at the lower section.

Table of content
Contents
CATCHMENT DETAILS:............................................................................................... 2
Table of content......................................................................................................... 3
Contents..................................................................................................................... 3
Introduction:................................................................................................................... 3
Rainfall estimation (Generation).......................................................................................... 5
Runoff estimation............................................................................................................ 6
Continuing losses:......................................................................................................... 6
Evaporation.......................................................................................................... 6
Infiltration:.............................................................................................................. 6
Initial losses................................................................................................................ 7
Depression storage and surface wetting...........................................................................7
Interception:............................................................................................................. 7
MODEL BUILD.............................................................................................................. 7
Overland flow modelling:............................................................................................... 8
Sewer Flow Modeling:................................................................................................... 8
Hydraulic Modelling (Transport)...................................................................................... 9
Modelling of Flow Obstructions in the Floodplain..............................................................9
Hydraulic Roughness................................................................................................ 10
Bridges and Culverts................................................................................................ 11
Bibliography............................................................................................................. 12

Introduction:
For this research paper, we are looking into the effect of the pluvial and fluvial flows
within the Blackwattle Bay regions. Two key problems must be checked keenly in the process
of the modelling conceptual and this simulation ought to be carried out with respects to two
cases. Pluvial is a flooding type that's as a result of heavy precipitation. In most scenarios it
happens due to heavy rainfall, this heavy rainfall can lead to surface water runoff whose volume
is more than that of the city ́s seepage framework. But in some few cases, this type of flooding
can result when the rainfall is not that heavy (Australia, 2011). It is exceptionally difficult to
predict pluvial than other flooding types such as fluvial because it happens in a brief period and
it can too pond before it forms surface runoff. Fundamentally pluvial flooding connects to direct
ponding or runoff before moving into a framework of drainage in this place.
In this project, it is possible to use the two scenarios that are waterway flooding, runoff
additionally surcharge that can be utilized as components of pluvial flooding (Kaufman, 2011).
As previously mentioned pluvial flooding because heavy precipitation can fall in regions such as
impervious and gardens areas such as pathways (Trun, 2011). In the area of pervious some
volume of water are prevented from infiltrating through the vegetation while others manage to
infiltrate but some will evaporate into the atmosphere and the remaining part forms the surface
runoff. A summary of the whole process discussed above is shown in the diagram below;