balby.gif (11241 bytes)

Belgrade, 27. Marta 71,  tel. +38163207646, balby@bitsyu.net

Copyright 2003 Balby International All rights reserved.

A)   Software for determining the infiltration velocity by functional dependency  on the filtration coefficient of granular materials:

                                         Vinf= f(K)

Pbdrdi02b.gif (53907 bytes)

 

The tabular representation of approximate values of  filtration coefficients for different kind of ground, according to Russian authors  V. I. Aravin and S. N. Numerov, is represented at next table:

No KIND OF GROUND

Filtration coefficient  (m/s)

1. Coarse gravel with pebbles 1 x 10E-3
2. Coarse gravel with admixture of sand (1 - 2) x 10E-3
3. Coarse sand (1 - 5) x 10E-4
4. Fine and dust sand (1 - 2) x 10E-5
5. Sandy clay (0.1 - 2) x 10E-5
6. Firmly compacted sandy materials (1 - 5) x 10E-6
7. Sandy humus material with large admixture of clay 1 x 10E-6  and less
8. Clear clay 1 x 10E-8  and less

 

IMPORTANT:                                                                                                                                                                             

The filtration velocity  for slow filters amount  from 2 to 10 m/day, namely from 0.08 to 0.4 m/h.

Enter a value of the filtration coefficient                 K(m/s)                                     

                                                                                                                 
             

Maximum  infiltration velocity  - Vinf-max (m/s) amounts 

Mean infiltration velocity - Vinf-mean (m/s) amounts 

 

Minimum infiltration velocity  - Vinf-min (m/s) amounts   

 

Value of mean  infiltration velocity  converted to m/h  - Vinf-mean* (m/h) amounts

                                                                                   

 

B)  Software for determining a volume of infiltrated water  (Q) and the infiltration surface (F), with condition that adoptive value of mean infiltration velocity is Vinf 0.1 m/h, apropos adoptive value of infiltration coefficient is K < 1.75*10-3

 

Volume of infiltrated water injected over infiltration surface is computed  by dependency on adoptive value of mean infiltration velocity as:

                                                                                        Qinf= Vinf * F

These volumes of infiltrated water over infiltration surface for values of mean infiltration velocity  Vinf 0.1 m/h,  could be determined by dependency on adoptive value of mean infiltration velocity according to diagrams shown below:

 

 

pbdrDi01b.gif (42325 bytes)

              

 

For work in this part of the software, needful is adopt a value from one of proximate suggested values of mean infiltration velocity of the diagram, based on computed value of mean infiltration velocity  per a hour, from first part of the software Vinf-mean (m/h).

   
(Vinf-mean*- 0.005 m/h, 0.01 m/h, 0.02 m/h, 0.03 m/h, 0.04 m/h, 0.05 m/h, 0.06 m/s, 0.08 m/h or 0.1 m/h)

 

 

Adopt a value from one of proximate suggested values of mean infiltration velocity of the diagram

    (Vinf-mean*- 0.005 m/h, 0.01 m/h, 0.02 m/h, 0.03 m/h, 0.04 m/h, 0.05 m/h, 0.06 m/s, 0.08 m/h or 0.1 m/h)

 

a) AVAILABLE INFILTRATION SURFACE IS KNOWN

 

Value of mean infiltration velocity per hour adopted of the diagram -Vinf-mean* (m/h)

        Enter a value of infiltration surface  F   (m2)             

                  Infiltration capacity amounts       Q (l/s)                  

                                                                                                                    

 

b) NEEDFUL INFILTRATION CAPACITY  IS KNOWN

 

Value of mean infiltration velocity per hour adopted of diagram -Vinf-av* (m/h)

 

  Enter value of requested infiltration capacity     Q (l/s)            

                             Infiltration surface amounts         F (m2)