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IMPORTANT !!!!
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CALCULATION IS POSSIBLE FROM MOBIL PHONE !!!
A)
Software for determining the infiltration velocity by functional dependency on
the filtration coefficient of granular materials:
Vinf= f(K)
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:
N^{o} 
KIND OF GROUND 
Filtration coefficient (m/s) 
1. 
Coarse gravel with pebbles 
1 x 10E3 
2. 
Coarse gravel with admixture of sand 
(1  2) x 10E3 
3. 
Coarse sand 
(1  5) x 10E4 
4. 
Fine and dust sand 
(1  2) x 10E5 
5. 
Sandy clay 
(0.1  2) x 10E5 
6. 
Firmly compacted sandy materials 
(1  5) x 10E6 
7. 
Sandy humus material with large admixture of clay 
1 x 10E6 and less 
8. 
Clear clay 
1 x 10E8 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  Vinfmax (m/s) iznosi 

Average infiltration velocity  Vinfaverage (m/s) amounts 

Minimum infiltration velocity  Vinfmin (m/s) amounts 

Value of mean infiltration velocity converted to m/h  Vinfsr* (m/h) 
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*103
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:
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 Vinfaverage (m/h).
Adopt a value from one of proximate suggested values of mean infiltration velocity of the diagram.
(Vinfaverage* 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 ili 0.1 m/h)
Usvojite vrednost jednu od najbližih predloženih srednjih brzina infiltracije sa dijagrama
(Vinfaverage* 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  Vinfaverage* (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  Vinfaverage (m/h) 

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



Infiltration surface amounts  F (m2) 