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When design and management decisions are made about environmental and water resources systems, they are based on what the decision-makers believe, or perhaps hope, will take place as a result of their decisions.

Introduction

When design and management decisions are made about environmental and water resources systems, they are based on what the decision-makers believe, or perhaps hope, will take place as a result of their decisions. The main objective of this project is to design a water system for a residential area. To design a water system, there are always two main parts which are storm water drainage system design and sewerage system design. This report will discuss the calculations and the drawings for both of these parts. It will also talk over some other points which include the steps to carry out the sewerage system design. In addition, this design report will cover the various properties for stormwater drains as well as the designing of the sewage system.
This report provides guidelines for the planning and designing of storm water management network with particular emphasis on drainage and sewerage systems. The document has been structured into broad sections, which cover the process from the initial concept design of stormwater systems through to the cost estimations and operational stage:
Stormwater Drainage Design
Sewer System Design
Water Supply Design
Estimated Cost

For the purposes of this report, the following is considered
Minor flood: 10 years ARI;
Major flood: 100 years ARI.

Stormwater Drainage Systems Design

The purpose of the storm water drainage system design is to design the location of pipes, junction pits side entry pits, and drains in site plan. In addition, designing the runoff from the blocks that discharges to the curbs and gutters when the rainwater has no retaining resistance in the hydrological model. In addition, determining the spacing and sizes of pits and pipes, and designing flow in underground pipe network that determines hydraulically the pipe sizes.
The following section could be included in appendices:
Layout diagram
Data
Long section

DRAINS SPECIFICATION

Rainfall intensity data shall be used for calculation.
All pipe grades shall be not less than 0.5%.
A minimum pipe diameter of 225mm shall be used for rear of property drainage with 400mm minimum cover.
Side entry pits shall be spaced at maximum 100 m flow distance and at “sag” (low) points in the road.

METHODS

By using the software namely DRAINS, a model in constructed to visualize the underground pipe system. The following steps were applied, final design in the appendix.

Open drains and import the DXF project file Drains strathalbyn.

a. Pipes on layers: Pipes
b. Pits on layers: Pits
c. Background Drains strathalbyn

2. Next, the hydrological model is defined. This is done by configuring the rational model.

a. The rainfall data obtained from the IFD table is entered following the minor and major time frames, 10 years and 100 years respectively.

3. Now, the pipes, pits and sub catchments are plotted.

a. Pit family: Adelaide single: City of Adelaide, 3% cross fall, 0.5 Grade.
b. Blocking factor: 0.2
c. Pipes type: Concrete under road 0.5%minimum slope.

4. Finally, a run test is conducted for the minor and major scenarios.

5. The data obtained from these tests are included in the appendix

Conclusion

To summarize, the first stage of this report covered the storm water drainage design. This is done by referring to the IFD and ARI data provided and the drawings and maps for the selected area. In addition, a series of calculations are carried through to obtain the necessary pipe sizes, connection type, pits, maintains shafts and manholes. In addition, the sewer system design helped find the invert level of each individual property to predict the direction of water flow through from block to block.
The entire system is designed to withstand the flow criteria in accordance with the ARI and IFD data, alongside the WSA standards. The stormwater system design met the specifications needed for a safe network, such as minimum pipe diameters, grading, spacing and sag points.
In regards to the sewer reticulation design, the pipes are designed to the required specifications in terms of size, displacement, and grade.
The potable water reticulation system by using watergem was designed to meet the given standards. The design followed the requirements for the valves, fire hydrants, main lines. However, the WaterGem model delivered some errors, though the steps and methods were followed to produce a safe reticulation system.
Furthermore, an estimation of the final design costs are included, a detailed excel based calculation for each component. The final design estimation was calculated to be around 480000$. Finally, design drawings are plotted for the project location to visualise the network for a safe Drainage system.

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