drains utility spreadsheet

Download Drains Utility Spreadsheet

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Spreadsheet to calculate drainage


IntroductionUtility Programs for DRAINSGeoffrey O'LoughlinAnstad Pty LtdMarch 2008This collection of spreadsheet utilities can be applied to create inputs for the DRAINS Program (www.watercom.com.au).DRAINS can accept a number of inputs from spreadsheets, such as rainfall intensity patterns, detention basin elevation-storagerelationships, weir characteristics and hydrographs.Some of the procedures set out here may be eventually in corporated into DRAINS, but most are more easily implemented and variedusing the capabilities of Excel.DisclaimerThese worksheets are supplied to users of the DRAINS program by Anstad Pty Ltd on the basis that they will check the validityof the results obtained and the methods used. Tests can be made by varying the program inputs and inspecting cell formulae.Anstad Pty Ltd does not accept liability for loss or damage of any kind claimed to arise either directly or indirectlyfrom use of this spreadsheet.INDEXThe following worksheets are provided in this version:Under the 'Rainfalls' Tag:1. Worksheet Calculating Intensities from Australian Rainfall & Runoff 1977 Polynomials2. Worksheet Calculating Probable Maximum Precipitation Patterns from Bureau of Meteorology (2003)3. Worksheet Setting Up Embedded Design Storms4. Temporal Patterns for Gold Coast City Council AreaUnder the 'Ponding' Tag:Worksheet defining Ponded Volumes at Sag Pits for use in DRAINSUnder the 'Basin Areas' Tag:Worksheet Calculating Elevation-Surface Area Relationships for Detention Basins of Certain ShapesUnder the 'Weirs' Tag:1. Worksheet Calculating an Elevation-Discharge Relationship for a Series of Weirs2. Worksheet Calculating an Elevation-Discharge Relationship for a Parabolic WeirUnder the 'Orifices' Tag:Worksheet Calculating an Elevation-Discharge Relationship for a Circular Orifice or for Multiple OrificesUnder the 'Pumping' Tag:Worksheet Establishing a Pumping Curve Relationship for use with DRAINSUnder the 'Tailwater' Tag:Worksheet Setting Time-Varying Tailwater Levels

RainfallsFour sheets are provided here.1. Worksheet Calculating Intensities from Australian Rainfall & Runoff 1977 PolynomialsEnter the 49 required factors in the table below. Results appear in the green cells.ARIFactors(years)ABCDEFG12.5841-0.5792-0.01320.00935-0.001792-0.00042200.0000784This is an obsolete method for calculating22.8558-0.5853-0.01450.00817-0.001339-0.00027540.0000419rainfall intensities using polynomial equations.53.1293-0.6054-0.01330.00776-0.001225-0.00014590.0000198While it was superseded by another method103.2768-0.6162-0.01300.00716-0.001019-0.0000301-0.0000060in the 1987 Australian Rainfall & Runoff, it is203.4463-0.6254-0.01300.00677-0.0008550.0000469-0.0000220still widely used, and the parameters A to G503.6459-0.6362-0.01310.00596-0.0005700.0001824-0.0000531are still available on information provided by the1003.7837-0.6435-0.01300.00542-0.0004150.0002791-0.0000733Bureau of Meteorology.DurationAverage Recurrence Interval (years)(minutes)125102050100544.259.281.897.6118.4148.9174.1641.455.376.491.1110.4138.8162.3739.052.171.885.5103.6130.0152.0837.049.467.980.797.6122.3142.9935.247.064.476.592.4115.7135.01033.744.961.472.887.9109.8128.01231.141.356.366.680.299.9116.31528.037.150.359.371.388.5102.82024.332.143.250.860.875.287.12521.628.538.244.753.565.976.23019.625.834.540. Worksheet Calculating Probable Maximum Precipitation Patterns from Bureau of Meteorology (2003)A developed version of the method given in previous Bulletins 51 and 53 is available for download from www.bom.gov.au/hydro/has/gsdm_document.shtmlThis procedure only determines the rainfall patterns. It does not apply the spatial distribution procedure described in Section 6 of the document.FOLLOW THE PROCEDURES BELOW, ENTERING VALUES IN THE YELLOW BOXES.1. Use one of the procedures below to determine probable maximum precipitation depths for various durations.If area >= 1 km2,Catchment Area (km2)2DurationSmoothRoughAveragedAdjustedRoundedPercent Rough (%)25Section 4.2(h)DepthDepthDepthDepthDepthElevation of Catchment (m)50Section 4.3(mm)(mm)(mm)(mm)(mm)Moisture Adjustment Factor (%)67Figure 30.250000.50000.7500010001.500020002.50003000400050006000Enter depths from Figure 4If area < 1 km2,for the particular catchment area.Check - Depths taken from Figure 4Point1 km2Point1 km2Catchment Area (km2)1DurationSmoothRoughAveragedAdjustedRoundedValueValueValueValuePercent Rough (%)25Section 4.2(h)DepthDepthDepthDepthDepth(Smooth)(Rough)(Rough)Elevation of Catchment (m)50Section 4.3(mm)(mm)(mm)(mm)(mm)(mm)(mm)(mm)Moisture Adjustment Factor (%)67Figure 30.252452452451641602502452502450.53503503502352303603503603500.7544044044029529046044046044015105105103423405705105705101.558065559940140064058074065526477706784544507106478807702.56908527314894907606909908523722938776520520810722109093847931065861577580900793125010655856117693662763096085613601176690012429866606601000900145012422. Transfer the results from eitherNote: Depths are calculated from those in Bulletin 53of the above procedures tocorresponding to zero area and to 1 km2.the coloured columns below.AdjustedDepth3. The intensities in the coloured columns given below can be transferred directly to the rainfall data base in DRAINS.(mm)Using your mouse, select the numbers in the pairs of columns required and choose Copy from the View menu.160Go to the DRAINS rainfall data base using the Project -> Rainfall Data option in DRAINS. Click the Add a New Storm button.230When the new window appears, click the Paste button. The numbers and accompanying graph will appear. Enter a suitable title.290Repeat the process as required.34040015 Minute Pattern30 Minute Pattern45 Minute Pattern60 Minute Pattern450TimeIntensitiesPercentagesTimeIntensitiesPercentagesTimeIntensitiesPercentagesTimeIntensitiesPercentages490(minutes)(mm/h)(%)(minutes)(mm/h)(%)(minutes)(mm/h)(%)(minutes)(mm/h)(%)5200845440552200418120326858057303856622455921754901263010346181055220105221510490126601515497181548714154901220331122045213204491125166625383112540810303031393036793520963532684010434028674545204550163455822601.5 Hour Pattern2 Hour Pattern2.5 Hour Pattern3 Hour PatternTimeIntensitiesPercentagesTimeIntensitiesPercentagesTimeIntensitiesPercentagesTimeIntensitiesPercentages(minutes)(mm/h)(%)(minutes)(mm/h)(%)(minutes)(mm/h)(%)(minutes)(mm/h)(%)024050252140196100166853367153241815294151525012103848303061730274143025012154329452701545255134525012203848602521460235126022911253367751981175216117520810303367901267901961090187935336710572410513771051668402886120120985120146745288613559313510455028861501508345528861654226024051806519247014437514438096285481904 Hour Pattern5 Hour Pattern6 Hour PatternTimeIntensitiesPercentagesTimeIntensitiesPercentagesTimeIntensitiesPercentages(minutes)(mm/h)(%)(minutes)(mm/h)(%)(minutes)(mm/h)(%)01396010140106415186815151615106430232103020283015864520994517674515866020996017676015867518687517677515869018689017679015861051627105176710515861201627120151612015861351396135151613513251501396150126515013251651165165126516513251809341801265180132519570319512651951325210462210101421010642254622257632251064240240763240793255502255793270502270793285251285532300300532315532Note: The method can only be used for durations up to 3 hours330261over a large part of southern and central Australia, including South Australia,345261western NSW and western Victoria - see Figure 2 of the Bulletin.3603. Worksheet Setting Up Embedded Design StormsThe applicability of the design rainfall patterns in Australia Rainfall and Runoff has been questioned by Phillips (1995), Rigby and Bannigan (1996) and Rigby et al (2003),who have suggested that rainfall burst patterns be embedded into longer patterns of the same ARI, to allow for rainfall occurring before the design burst.This section shows an example of an embedded storm, and provides the numerical percentage data specifying the patterns applying to the eight zones of Australiashown in Figure 3.2 of Australian Rainfall and Runoff (1987). It is not possible to provide a general procedure because many combinations of times steps andstorm durations are involved Those wishing to use this procedure will need to set up their own cells in the same way as shown in the example. Percentage rainfallsare provided for all zones.References:Phillips, B.C. (1995) Drainage Design Practice for Land Development - Rational Formula Procedures, 2nd International Symposium on Urban Stormwater Management, Institution of Engineers, Australia, MelbourneRigby, E.H. and Bannigan, D.J. (1996) The Embedded Design Storm Concept - A Critical Review, 23rd Hydrology and Water Resources Symposium, Institution of Engineers, Australia, HobartRigby, T., Boyd, M., Roso, S., VanDrie, R. (2003) Storms, Storm Bursts and Flood Estimation, A Need for Review of the AR&R Procedures, 28th Hydrology and Water Resources Symposium, Institution of Engineers, Australia, WollongongThe following example shows a 1 hour storm embedded in a 9 hour duration pattern.1 hour intensity (mm/h)999 hour intensity (mm/h)25.4Total Depth (mm)99Total Depth (mm)228.6Depth of Highest 1 Hour (mm)71.5518Correction Factor0.82522435791. Set out the 9 hour2. Locate the 1 hour pattern overpattern using the shorterthe highest 1 hour part of the3. Select the orange columns belowtime step for the 1 hour9 hour pattern, and scale otherand transfer to the rainfall databasepattern.depths by the correction fac