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Assignment on OSD and Easement DrainageThis aim of this assignment is to design property drainage. The following should be undertaken for the drainage design for the subdivision shown in the attached...

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Assignment on OSD and Easement DrainageThis aim of this assignment is to design property drainage. The following should be undertaken for the drainage design for the subdivision shown in the attached plan.Part A• Design the OSD system using the UPRCT method. Specify the stormwater drainage from each lot to the OSD and from OSD to pit A. Calculation of the pipe size is not required. Use a 225 mm UPVC pipe for this purpose.Design of the OSD should include plan and sections of the OSD, orifice details, sedimentation pits, inspection pits (for underground OSD). Include all relevant level information.Part B• Check 450 rcp pipe size from the Pit A to the 600 mm rcp in the street. Relevant levels are given in the diagram attached. Check of 450 rcp pipe size from the Pit A to the 600 mm rcp should include a HGL analysis (best done in DRAINS may also be used). Specify input data to DRAINS in tabular formPresent your results in the form of a printed report. Note the report should only include sketches and calculations. Written description of the design procedure is not required.Student should submit the assignment to the UTSonline. The whole assignment including sketches, diagrams etc, must be in one MSWORD or PDF document.This assignment is worth 25% of the course mark. Marking Criteria OSD calc - 20 Drainage to and from tank - 20 Tank design/pipe design - 20 Input data to Drains- OSD, K, tc, - 20 Long section - 10 Clarity of Presentation -10
Answered Same Day May 22, 2021

Solution

Hemalatha answered on May 31 2021
141 Votes
Definition Diagram
                                                                                                                        74.2 m
                74.1 m
                                                                                        Level of weir - 73.1 m
                                                                                        Invert leve of pit 0 73 m
                                                                                        Maximum head to outlet invert - 1m
lot 1
                Calculation of OSD For Upper Pa
amatta River Catchment Trust OSD Method
                Site Area        a
Kandasamy: Total area of site        5400        m2
                Basic Storage        b        253.8        m3                                                                        area calculation
                Basic discharge        c        0.0432        m3/s                                                                        Lot #        area
                Area drained to storage        d
Kandasamy: Area of site that drains to OSD storage        4800        m2                                                                        7        600        750        *        0.8        Since the contour is 74.1, some portions in lot 7
                % drained to storage        e
Kandasamy: Cell D5/Cell D2 in percent        88.9        %                                                                        8        784                                will not drain to the OSD system.
                Storage per ha        f        528.8        m3                                                                        9        688                                 Hence reduce the area by 20% (Say).
                PSD/ha        g        0.069        m3/s/ha                                                                        10        821
                PSD        h
Kandasamy: PSD -...
SOLUTION.PDF
SOLUTION.PDF

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