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SWMM 5 Error Messages
Orifice and Weir flow calculations
Note: Orifice and Weir Flow Computations The orifice flow calculation proceeds as follows: 1. Initially and whenever the setting (i.e., the fraction opened) changes, flow coefficients for both orifice and weir behavior are computed as follows: a. For side orifices: Define Hcrit = h/2 where h is the opening height. b. For bottom orifices: i. For a circular orifice, compute area over length (i.e., circumference) as AL = h /4. ii. For a rectangular orifice compute AL = h*w/(2*(h+w)) where w is the opening width. iii. Compute Hcrit = Cd*AL/0.414 where Cd is the orifice discharge coefficient. At step 1b, the critical head for the bottom orifice, where orifice flow turns into weir flow, is found by equating the result of the orifice equation to that of the weir equation Cd*Area*sqrt(2g)*sqrt(Hcrit) = Cw*Length*sqrt(Hcrit)*Hcrit or Hcrit = (Cd * Area) / (Cw/sqrt(2g) * Length) The value of Cw/sqrt(2g) for a sharp crested weir is 0.414. ...
Very impressive digital archive of SWMM relics, some dating back to 1970s. My favorite one is Combine file with an end date of 12-30-1899. Most of the 277 files in the box are small single-event models. There are about 10 continuous models which are very small 10-node systems for 30-60 day simulations; none for full year.
ReplyDeleteContinuous Model Examples
1. EXAM1_45_days_SW5.INP, 45 days, 9 junctions
2.EXAM1_long_simulation_no_surcharging_with_No_offsets_SW5.INP, 41 days, 9 junctions
3. exam1_dwf.INP, 22 days, 9 junctions
4.really_long_extran_master_swmm34_example_SW5.inp, 50 days, 55 junctions
For testing large simulation models, please add a 1000+ subcatchment/node file with at least a 12-month simulation period and a run time of at least few hours.
Sam Shamsi
4/24/2015