PC-Progress Discussion Forums

Thanks for your explanation Jirka, but it is somehow still unclear to me sorry. So, only if the number of observations minus the number of parameters is bigger than 0, RETC does: Z=1./FLOAT(NOB-NP) TVAR=1.96+Z*(2.3779+2*(2.7135+2*(3.187936+2.466666*Z**2))) SECOEF-E(I)*SDEV TVALUE-TH(I)/SECOEF TVALUE...

Dear All, I was wondering if somebody could explain me or point me out to the literature in order to know How the 95% interval of confidence in RETC is calculated. In "1.7 Parameter Optimization and Nonlinear Fitting" Simunek and Hopmans, equation [1.7-24] states that betamin = beta - tdistribution*...

Thanks

Oh, I did not know that. Might I ask you how do you know that it is badly defined. I mean I know that If I have an unknown I will need 1 equation, if I have 5 unknowns then 5 equations (that are linear independent between them). So I wonder, how can I know (before hand) if it is well or bad defined?...

Hi,

I have the same problem (see attached document), and so far I still have solved, It did not have this problem for similar models. Any idea how to solve will be helpful, maybe it is just a dumb mistake.

Thanks

Best regards,
Dani

Dear Prof. Dr. Simunek, I have two doubt concerning this post: 1) Is the Gamma_s (i.e. solute mass transfer term (ML-3T-1)) in Hydrus-1D calculated only as FracMTS(i)? or it is calculated like equation (7) of Gerke and van Genuchten [1996], namely: FracMTS(i)+Gamma_w*(ci) where Gamma_w is water tran...

Dear Prof. Dr. Simunek, I have a doubt concerning equation (2.99) or (2.102) in manual version 4.17 (June 2013). The equation is given as: K_a(h) = 0.5*[K_a(h_f)+K_a(h_m)], here K_a(h) would be rKaFi. Can this equation be we written as: K_A(h)=0.5*[K_a*(krf(h_f)+krm(h_m))]. ? where h_f is the pressu...

Dear Prof. Dr. Jirka, I have a doubt concerning equation (2.99) or (2.102) in manual version 4.17 (June 2013). The equation is given as: K_a(h) = 0.5*[K_a(h_f)+K_a(h_m)], here K_a(h) would be rKaFi. Can this equation be we written as: K_A(h)=0.5*[K_a*(krf(h_f)+krm(h_m))]. ? where h_f is the pressure...

Sorry. Thanks, it works perfectly.

Hi all, I am running a simple simulation (see attached file). I have a simple Richards' equation and Solute Transport. In Richards' equation I have as boundary conditions: 1) Lower Boundary conditions: Variable Pressure Head, 2) Upper Boundary condition: Constant Flux. I have noticed that changing t...

Hi, I was wondering if somebody knows what happens with the mass of a species that is not transport. Imaging that I have only defined As(5) as a component in the transport part, and then after a batch calculation Phreeqc assumes that there is some redox part of As(5) that becomes As(3). What happens...

Hi, I was wondering if somebody has previously work with HP1 inputing Phreeqc files _Raw (Such as Solution_Raw, Equilibrium_phases_raw, ...) I have done the first tutorial of the manual (Transport and Dissolution of Gypsum and Calcite) but I have changed the solution 1001 equilibrium_phases 1001 gyp...

Yes, my bad about Mn. Now, it is working with less than 20 solutes.

Dear Hydrus (and HP1) users, I have not found any post where somebody has work with more than 20 components in HP1 (using the grapical interface it seems to be the maximum). Using the graphical interface of Hydrus-1D. I have been able to run HP1 with 19 components (no interaction with any surface, o...