Analysis Of Pressure Analysis In EPANET

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Pressure analysis in EPANET
The Hazen-Williams formul was used, because it is the most widely used head loss formula. It cannot be used for liquids other than water and was originally developed for turbulent flow only. 1
Where V= mean velocity of flow in pipe (m/s)
R= hydraulic radius (mean depth) (m)
S= hydraulic gradient
C= coefficient of roughness of pipe
Table 3. 1 lists expressions for the resistance Coefficient and values for the flow exponent for each of the formulas
Table 3. 1 pipe head loss formulas for full flow
Formula Resistance Coefficient
(A) Flow Exponent
(B)
Hazen-Williams 4.727 C-1.852d-4.d871L 1.852
Notes: C = Hazen-Williams roughness coefficient d = pipe diameter (ft)
L = pipe length (ft)

Source: EPANET Multi-Species Extension User’s manual

Table 3. 2 Roughness coefficient
Material Hazen- Williams coefficient (C)
Cast iron 130-140
Concrete or concrete lined 120-140
Galvanized iron 120
Plastic 140-150
Steel 140-150
Vitrified clay 110

Source: (EPANET, 2002)
3.3.2 Water CAD
Water CAD software was used to see the nodal and link features of the water supply and distribution network for scheme-1 and scheme-2 of Woldiya town. …show more content…

The hydraulic Network of the water supply Distribution system and the town water supply design has been analyzed for the present situation. During data analysis, the nodal pressure and pipe link velocity has been determined to identify high or low pressure zones areas of the node/junction where the pressure is higher or lower than the design criteria of system network. These findings of hydraulic Network of the water supply Distribution system of the town bring the suggestion and recommendations that will help to improve the water supply system of Woldiya

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