EPANET users

Hello,

Salutations to all EPANET users that are in this list. I'm a strudent of
engineery from Bacelona who is doing his project to obtain the degree.
I'm doing a water distribution simulation using a fluidic-electrical
analogy, so I'm going to simulate water distribution systems doing their
electrical analog circuit and simulting them using PSpice. After that
I'm going to use the EPANET program to validate the results obtained,
but I need to know some things about EPANET:
- I suppose turbulent flow in the system and I use the Darcy-Weisbach
formula to calculate the pipe head losses, but I don't know which
formula uses EPANET to calculate the friction factor f, is this the
Coolebrock formula?
- About pumps, which formulas use EPANET to calculate the coefficients
'a' and 'b' for Custom Curve, Standard Extended Flow Range?
I'll be grateful if someone reply me. THanks,


Josep Sorribes
Universitat Politècnica de Catalunya (UPC)
Barcelona, Spain
email: sorribes@ic.upc.es

Josep Sorribes Monros asked which formula EPANET uses to compute
the Darcy-Weisbach friction factor for turbulent flow. EPANET uses the
Swamee and Jain equation which is an explicit approximation to the
implicit Colebrook-White equation. For more details on equations for the
friction factor, see "Analysis of Flow in Water Distribution Networks" by
P.R. Bhave (Technomic Publishing, 1991).

Lew Rossman