Flow supplied and flow demanded is zero

As explained in your other forum post, it implies that there are no demands in the model, WaterGEMS / WaterCAD is demand driven software. You need to enter demands at junctions through demand control center or junction properties. Also check tank levels , whether correct levels are specified and how it is operating, plot a graph for that purpose. 

Here is learning resource guide for your reference to help you get started, you may start with quick start lessons. 

Learning Resource Guide for new users of Bentley WaterGEMS and WaterCAD 

i have put a demand at each node but still it is showing zero flow demand

Check if you have assigned correct demand alternative to the current scenario, check if those junctions are active which have demands. 

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i have uploaded the files please review it and tell me the solution it is very urgent .

Hi Khushwant,

Your demands are entered with units of L/Day, but the calculated Demand (in the Calculation Summary and junction properties for example) are set to L/s. Change the units to L/Day to match the input units and you'll see values greater than zero. (see below)

For example junction F10 has a demand of 630 L/day which shows as 0.0 L/s because of decimal precision. 630 L/Day = 0.007292 L/s

Hi Khushwant,

Your demands are entered with units of L/Day, but the calculated Demand (in the Calculation Summary and junction properties for example) are set to L/s. Change the units to L/Day to match the input units and you'll see values greater than zero. (see below)

For example junction F10 has a demand of 630 L/day which shows as 0.0 L/s because of decimal precision. 630 L/Day = 0.007292 L/s

Thank you Jesse you are a genius man ,it solved my problem thanks again