EGH471 Advanced Water Engineering: Catchment Analysis Project Report

This report presents a catchment analysis project focused on a proposed residential development at the Samford ecological research facility. The analysis includes background information, site details (environmental, geographic, and proposed development), and flood analysis. The catchment area and longest drainage length were determined, followed by peak flow calculations for 10 and 100-year ARI flood events, considering an impervious factor. The report also details culvert design, stormwater drainage considerations, and recommendations for a conceptual plan. The flood analysis includes the creation of flood envelopes. The culvert design section includes explanations and design calculations for different types of culverts, with a box culvert design suggested. The report provides a comprehensive overview of the project, including tables, figures and calculations, and serves as a valuable resource for understanding catchment analysis and water engineering principles.

CATCHMENT
ANALYSIS PROJECT
EGH471 ADVANCED WATER ENGINEERING

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Executive Summary
The thesis report brings an overview of the catchment analysis report for the Samford area
research facility development. The first chapter of the report discusses the background
information. Then the site information are explained in the second section of the report. Here
the environmental information, geography, proposed development, and demarcation details
are given. The area of the catchment is founded as 167.9 ha and the length of the longest
drainage is founded as 2.957 km. And the flood analysis details are explained in the third
section of the report. The peak value of flood events in the last 100 and 10 years are founded
asQ 100=25.66 m3 /sec ¿ Q 10=13.57 m3 /sec. 40 % impervious factor is considered for the
design. And the peak value of flood events in the last 100 and 10 years with considering the
impervious factor are founded as Q100=42.35 m3 /sec Q10=22. 41 m3 /sec. Also the developed
flood, envelope is shown in this section. Then the fourth chapter of the report discuses about
the culvert design. Where the explanations and design calculations for the different types of
culverts are given. Here the box culvert design is suggested. And Strom water drainage
details are explained in fifth section. The sthe ixth section of the report contains
recommendation for ca onceptual plan.
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a List of Figures
Figure 2-1 Site Selected............................................................................................................8
Figure 2-2 Proposed Plan.........................................................................................................9
Figure 2-3 Proposed Development.........................................................................................10
Figure 3-1 Length from outlet to elongation...........................................................................11
Figure 3-2 IFD Chart..............................................................................................................16
Figure 3-3 Flow cut sections...................................................................................................20
Figure 3-4 Calculation for section3........................................................................................22
Figure 3-5 100 Year ARI flood envelop..................................................................................23
Figure 3-6 Residential area with flood risk............................................................................23
Figure 4-1 Culvert Design......................................................................................................29
Figure 4-2 Inlet condition.......................................................................................................32
Figure 5-1 WSUD....................................................................................................................39
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List of Tables
Table 3-1 Total Area...............................................................................................................12
Table 3-2 Intensity-Frequency-Duration Table......................................................................14
Table 3-3 C10 values for Zero Fraction Impervious..............................................................18
Table 3-4 Frequency Factor....................................................................................................19
Table 3-5
𝐶10 values for fraction impervious........................................................................19
Table 3-6 Calculations for section 3.......................................................................................21
Table 3-7 Mannings n Table...................................................................................................22
Table 4-1 Table of entrance loss coefficents...........................................................................27
Table 5-1 Queensland Pits......................................................................................................36
Table 5-2 Pipe Information.....................................................................................................38
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Table of Contents
Executive Summary...................................................................................................................1
List of Figures............................................................................................................................2
List of Tables..............................................................................................................................3
1. Introduction........................................................................................................................7
1.1 Background..................................................................................................................7
1.2 Objectives of the Project.............................................................................................7
2. Site Analysis.......................................................................................................................8
2.1 Environment................................................................................................................8
2.2 Geography...................................................................................................................8
2.3 Proposed Development................................................................................................9
2.4 Demarcation................................................................................................................9
3. Flood Analysis.................................................................................................................11
3.1 Hydrologic Parameters..............................................................................................11
3.2 IFD Tables & Curves.................................................................................................13
3.3 Peak Flows.................................................................................................................17
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3.4 Flood Envelopes........................................................................................................20
4. Culvert Design.................................................................................................................24
4.1 Parameters.................................................................................................................24
4.2 Sedimentation & Erosion Control.............................................................................25
4.3 Terrestrial Passages...................................................................................................26
4.4 Design........................................................................................................................26
4.4.1 Box Culvert........................................................................................................27
4.4.2 Staggered Box Culvert.......................................................................................29
4.5 Final Design...............................................................................................................33
5. Strom Water Drainage......................................................................................................34
5.1 Retention & Detention Systems................................................................................34
5.2 Road Drainage...........................................................................................................35
5.3 Pipe Dimensions........................................................................................................37
5.4 WSUD.......................................................................................................................39
6. Recommendations for the Conceptual Plan.....................................................................42
7. References........................................................................................................................43
9. Appendices.......................................................................................................................49
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Appendix A..........................................................................................................................49
Appendix B..........................................................................................................................51
Appendix C..........................................................................................................................54
Appendix D..........................................................................................................................56
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1. Introduction
1.1 Background
There has been a growing demand for new residences in the area approximately 3 km
southeast of the existing Samford Township. It is 25 Km from Brisbane with the Samford
Creek and its tributaries flowing through the nearby areas. Formally known as the Samford
ecological research facility site, it is the location for a fully sustainable residential model with
the owners of the site rooting for and exploring such a sustainable project (Aksoy, Kirca,
Burgan & Kellecioglu, 2016). Although not yet vetted against basic engineering
requirements, the plan for this development project, at a conceptual level has been proposed
by the chosen developer that you can download as an AutoCAD map in electronic format. It
is to be underlined that this design is at a concept stage as of now and has been developed
keeping in mind the sustainable and green living objectives of the client (Badyalina & Shabri,
2015).
1.2 Objectives of the Project
Undertake various hydrological assessments to investigate the robustness of typical flood
design eventualities, keeping in mind the layout of roads and footpaths and other primary
service provisions and the layout of subdivisions, as well as find out whether the allocated
buffer zones around the primary infrastructure for drainage along the main tributary is
sufficient and effective
A safe way of passing across the main tributary is of utmost importance hence propose a
culvert structure design to ensure safe zones for the proposed upstream and downstream
subdivisions.
Utilize lectures of industry experts to compare the tasks proposed in this project to that of
real-world scenarios.
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2. Site Analysis
Figure 2-1 Site Selected
2.1 Environment
The area surrounding the planned development project comprises of various waterways as
indicated in the figure given below. Four main waterways crisscross the planned development
project area. The area demarcated for residential constructions comprises of substantial
vegetation cover. (Balan, Crenganiş & Pricop, 2015) From peak flow calculations, contained
in the last part of the report the area can be assumed to consist of thick vegetative cover with
average soil porosity as clearly indicated in the figure attached. These vegetative cover must
be cleared to provide space for the planned residential construction project. Moreover, the
only way into the area is via Samford Barracks residence where gravel road converge from
both ends before leading to the tarmac road.
2.2 Geography
The site where the residential project is to be developed is at the center for ecological
research based at Samford. This center is situated 25 km away from Brisbane. From Samford
residential, it is 3 km away to the southeast. The terrain comprises of gentle slopes and ridges
with Samford ridge bordering its northern end. This ridge is second to the main drainage unit
in the area. Samford area is sparsely populated which explains why it is under the rural
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residential category. (Bao, Yagoda-Biran & Hatzor, 2013) However, soon it will be under
urban planning especially on the gently sloping part of the valley as indicated by the contours
in the figure below.
2.3 Proposed Development
Figure 2-2 Proposed Plan
The above-given figure shows a proposed model of the construction. In the figure, the
black color demarcations show the house and road planed. The proposed design seems like a
loop. In the center it contains roundabout. Here we can see the houses are arranged on the
two sides of roads.
2.4 Demarcation
A close examination of the figure provided, reveals that the planned development project
locates the residential units over the ridges close to the nearby waterways. The figure below
shows the intended development zone at Samford. (Choudhury, 2010) (Chowdhary, Escobar
& Singh, 2011)The catchment region is clearly demarcated by pink lines beginning at the
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blue dot above the catchment zone. The red line clearly shows the longest drainage distance
in the figure provided.
Figure 2-3 Proposed Development
This is a matter that needs to be looked at because it is not advisable to construct units
over creeks due to flood disasters. A 10 or 100-year ARI stream overflows analysis is
required in redesigning it. (Cian, Marconcini & Ceccato, 2018) This project undertakes to
study at all the mitigations against property damage in the event of a flood catastrophe.
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3. Flood Analysis
3.1 Hydrologic Parameters
Hydrologic variables show the bottom data regarding the ability website and are one of
the significant factors within the following calculations during this structure analysis report.
This report highlights that two hydrologic variables i.e longest drainage length and area of the
catchment were determined using AUTOCAD. (Doorn, 2013) (Dottori, Martina &
Figueiredo, 2016) The variables were utilized in deciding two more significant variables in
peak runoff, being slope and time of concentration. The calculation the previously
highlighted peak flows are essential for concerns with the planning of structures frameworks
like the drain bridge. This data leads us to design minor and major important events to reduce
flooding and stop the submersion of structure.
0 500 1000 1500 2000 2500 3000 3500
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Length (m)
Elevation (m)
Figure 3-4 Length from outlet to elongation
Catchment Area, A=1679606.3875 m2
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