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

                                         Vinf= f(K)

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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:

 

 

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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)