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RFI - C - Site Based Stormwater Management Plan

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Stormwater FLOW Calculations - Boyd's formula
This section outlines rational method calculations for On Site Detention (OSD) and Site Storage Requirements (SSR)
Permissible Site Discharge (PSD) Calculations
 Calculated PSD                              20.5
 PSD Override Value Used

Site Storage Calculations
 Preliminary On Site Detention (OSD)
 tank size required estimate (m3)            4.30                   Boyd's formula formula

 OSD and storages* provided (m3)             9.2                                      Includes storages: rainwater tank retention allowance,
                                                                            rainwater tank detention, and additional added storage volumes
 Additional detention / retention
                                             -4.9
 volume required (m3)
 Base case (pre-development) fraction
                                             0.40
 impervious (ratio)
 Base case runoff coefficient                0.82
 Post development total impervious
                                             0.0376
 area (in hectares)
 Post development fraction impervious
 (ratio)                                     0.65

 Post development runoff coefficient         0.868
 Pre-development design storm                20% AEP (~1 in 5 year ARI storm) - default residential
 Post development detention required         1% AEP (~1 in 100 ARI)
 Critical Storm Duration - the
 Catchment time of concentration –           10
 Tc(catchment) in minutes
 Rainfall Depth (mm) for Critical Storm
                                             25.71
 Duration - Tc(catchment)
 Rainfall intensity - i at Tc(catchment)
                                             154.3
 (mm/h)
 Travel time from discharge point            5.0
 to catchment outlet (min) - Tcs
 Rainfall Depth (mm) for Tcs - (IFD at       18.74
 Tcs)
 Rainfall intensity - i at tc(site) (mm/h)   224.88

 OSD tank flow restrictor orifice diameter = 99 mm




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