Use the emitter option in EPANET. Use a default coefficient of 0.5. For accurate results this can be calculated based on the manufacturers specifications.
see Drip Irrigation Design Guidelines by Jess Stryker for more details
Can I model a borewell source in EPAnet?
All sources can be represented by a reservoir in EPAnet. A head pattern can be utilised to model the draw down curve if data is available. Headloss through the screens and piping can be modelled by using pipes and loss coefficients.
Can I model pumping main in EPANET?
EPAnet is not the ideal software for modelling a pumping main. Modelling a pumping main requires transient analysis, for which specialised software is available and more important an expert in surge analysis.
How do I model a Variable Speed Pump?
Use the control statements to define the relative speed of the pump with respect to the flow. EPAnet applies the pump affinity law to calculate the corresponding head - discharge relationship.
How do I calculate the balancing storage?
Balancing storage can be calculated using the mass curve method.
A mass diagram is the plot of accumulated inflow (i.e. supply) or outflow (i.e. demand) versus time. The mass curve of supply (i.e. supply line) is, therefore, first drawn and is superimposed by the demand curve. The procedure to construct such diagram is as follows:
From the past records, determine the hourly demand for all 24 hours for typical days (maximum, average and minimum).
Calculate and plot the cumulative demand against time, and thus plot the mass curve of demand.
Read the storage required as the sum of the two maximum ordinates between demand and supply line.
Repeat the procedure for all the typical days (maximum, average and minimum), and determine the maximum storage required for the worst day.
How do I fix the storage capacity of tanks?
The total storage capacity of a distribution reservoir will depend on the following.
Balancing Storage: The quantity of water required to be stored in the reservoir for equalising or balancing fluctuating demand against constant supply is known as the balancing storage.
Breakdown Storage: The breakdown storage or often called emergency storage is the storage preserved in order to tide over the emergencies posed by the failure of pumps, electricity, or any othe mechanism driving the pumps. A value of about 25% of the total storage capacity of reservoirs, or 1.5 to 2 times of the average hourly supply, may be considered as enough provision for accounting this storage.
Fire Storage: The third component of the total reservoir storage is the fire storage. This provision takes care of the requirements of water for extinguishing fires. A provision of 1 to 4 per person per day is sufficient to meet the requirement.
How do I model a Check Valve in EPANET?
Insert a link where a check valve needs to be modelled and then change the status to CV. This converts the link to a check valve (check reverse flow).
How do I model a Break Pressure Tank (BPT) ?
The simplest form of modelling a BPT is to model it as a tank with relevant elevation and storage. However since the tanks in EPAnet are modelled as connected from tank bottom, it is preferable to model the tank with a PSV in the upstream with a pressure setting = 0 (atmospheric pressure) and a check valve at the downstream to check reverse flow.