2013年2月15日 · A peak rate factor of 484 will generate a much larger peak flow rate than using a peak rate factor of 300 and 300 seems more appropriate in flat area according to the statement above from NEH. I did some searches on google and found an interesting paper by Josha Crowley and Alan W Moore for a flood study in Cameron County, TX, in which they ...

2009年8月19日 · I would just like to get some clarification on calculating peak flows in a residential township. the average annual daily demand is 1200l/d now if the instantaneous peak factor of 5 is used, does this mean that the flow rate at peak demand will be: 1200x5/(24x60x60)=0.09 l/s seems a bit low...

2014年8月28日 · To estimate the peak flow, I started the same way I would estimate peak sewer flows: 50 units x 100 gpd = 5,000 gpd (or 3.5 gpm) multiplied by a peaking factor of 4 = 14 gpm total peak flow for the entire building I quickly realized that this answer does not make sense since a few showers/sinks on at the same time would surely exceed 14 gpm.

2005年5月9日 · The peak factor is a characteristic of the Unit Hydrograph used in the runoff calculations. HydroCAD includes the standard SCS UH (with a peak factor or 484) and the Delmarva UH (PF=284). Use of other peak factors is very rare, but can be accomplished by providing a custom unit hydrograph table. For details, click the Windows Start menu and select

2007年7月4日 · As RWF7437 and others have noted, you do not need to use a peaking factor on the 8 hour day since you have equated the 24 hour flow to the peak hour flow. If you want to figure the peak using the normal 3-4:1 factor, then: 75,000 gal/ day with a peaking factor of 3.8 = 197 ga/ min Anyway, you are using only 8" sewers.

2002年10月29日 · What I'm getting at is during a Max Day Event (~roughly 2xADD), where the average consumption rate for that day (whole system) is greater than the Peak Hour Rate (1.8xADD) for an Average Day Demand, Im am doubting that the system experiences a 1.8 Peak Hour Factor during a Maximum Day Demand, since …

2008年1月18日 · The peak factor is a function of the Unit Hydrograph, which can be selected on the calculation settings screen. Most projects will use the standard SCS 484 peak factor, or the Delmarva peak factor of 284.

2003年9月29日 · In the UK we use a factor 1.125 to account for a localised variation in the flow. In the computer junction software that we use (arcady for roundabouts and Picady for priority junctions) it is already accounted for, so for manual cals the flows are alwways factored by 1.125 before you start.

2011年7月24日 · K factor is 0.082 (calculated using traffic volume in both directions) How can we convert the peak hour traffic volume to daily 24 hour traffic volume? If I use the formula DDHV=ADT*K for ADT calcualtion, the resultant value of ADT looks very high.

2006年8月9日 · Peak flow as calculated in the plumbing code (based on Drainage Fixture Units) is to ensure pipes have plenty of capacity. Doubtful if a building will ever experience that peak, especially with attenuation within the lines. Septic ssytem design is typically based on a daily average flow. Is your water useage metered? That would be a good check.