How can I calibrate my model? I have two fire hydrant flow tests? Not exactly sure what to do with that information?

Flow Test Calibration

For two hydrant flow tests,

First make sure static results are good.

1. Set up a scenario, say Static 1.
2. Set the boundary conditions (tank water levels, which pumps are running, demand alternative) for the time you made the measurement.
3. Run that scenario and note the model HGL (hydraulic grade line) at residual hydrant
4. Convert your field pressure under static conditions to HGL units using the elevation of the residual pressure gage
5. Compare field HGL and model HGL
6. If they don’t agree, figure out why and make corrections until they agree
7. If they agree, repeat for Static test 2

Now your static model is good for the static condition

8. Set up a scenario, say Flowed 1 as a child to Static 1
9. Set the new demand alternative to include the hydrant flow at the correct node
10. Run the scenario and record the model HGL at the residual hydrant
11. Convert your field pressure during the flow test to HGL units using the elevation of the residual pressure gage
12. Compare field HGL and model HGL
13. If they don’t agree, figure out why and make corrections until they agree
14. If they agree, repeat for Flowed test 2

Once you get agreement for all 4 scenarios: Static 1, Static 2, Flowed 1 and Flowed 2, you can feel comfortable using the model in that area over a range of conditions.

Flow Test Calibration

For two hydrant flow tests,

First make sure static results are good.

1. Set up a scenario, say Static 1.
2. Set the boundary conditions (tank water levels, which pumps are running, demand alternative) for the time you made the measurement.
3. Run that scenario and note the model HGL (hydraulic grade line) at residual hydrant
4. Convert your field pressure under static conditions to HGL units using the elevation of the residual pressure gage
5. Compare field HGL and model HGL
6. If they don’t agree, figure out why and make corrections until they agree
7. If they agree, repeat for Static test 2

Now your static model is good for the static condition

8. Set up a scenario, say Flowed 1 as a child to Static 1
9. Set the new demand alternative to include the hydrant flow at the correct node
10. Run the scenario and record the model HGL at the residual hydrant
11. Convert your field pressure during the flow test to HGL units using the elevation of the residual pressure gage
12. Compare field HGL and model HGL
13. If they don’t agree, figure out why and make corrections until they agree
14. If they agree, repeat for Flowed test 2

Once you get agreement for all 4 scenarios: Static 1, Static 2, Flowed 1 and Flowed 2, you can feel comfortable using the model in that area over a range of conditions.