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You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. Try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object. Worst case, I am 100% certain there is an Actuator for "Exterior:Lights" called "Electric Power" (set the End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm)
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. ~~Try~~ I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this ~~object. Worst case, I am 100% certain there is an Actuator for "Exterior:Lights" called "Electric Power" (set the End-Use Subcategory to "Water Pump"~~ object or ~~whatever you want in order to have the right reporting in your eplustbl.htm)~~

Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)

Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.

Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

not.

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object or not.

Here's a completely untested, written on the fly and manually (problems/typos expected), EMS snippet. I think the calling point should be about right, but you may have to change it.

Exterior:Lights,
  RainWaterPump,
  [...],
  Rain Water Pump; !- End Use Subcategory


EnergyManagementSystem:Actuator,
  RainWaterPump_ElecPower_Override,                             !- Name
  RainWaterPump,                                                   !- Actuated Component Unique Name
  Exterior:Lights,                                       ! Actuated Component Type
  Electric Power;                                             ! Actuated Component Control Type

WaterUse:Storage,
   RainWaterTank, !- Name
   [....]

EnergyManagementSystem:Sensor,
  RainWaterTank_OutletFlowRate_Sensor, !Name
  RainWaterTank, ! Output:Variable or Output:Meter Index Key Name
  Water System Storage Tank Outlet Volume Flow Rate; ! Output:Variable or Output:Meter Name

EnergyManagementSystem:ProgramCallingManager,
  Initialize EMS for Run , ! Name
  AfterPredictorAfterHVACManagers ,       ! EnergyPlus Model Calling Point
  Model_RainWaterPump;                 ! Program Name 1

EnergyManagementSystem:Program,
  Model_RainWaterPump ,         ! Name
  IF RainWaterTank_OutletFlowRate_Sensor > 0,
    ! ### IMPLEMENT PUMP POWER CALC HERE, assuming 30 ft of head and 0.5 total pump eff ###
    SET RainWaterPump_ElecPower_Override =  RainWaterTank_OutletFlowRate_Sensor * 89,672 / 0.5,
  ! This IF/ELSE statement is useless here (if flow is zero, power is zero), but I wanted to show the syntax
  ELSE,
     SET RainWaterPump_ElecPower_Override = 0.0,
  ENDIF;

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object or not.

Here's a completely untested, written on the fly and manually (problems/typos expected), EMS snippet. I think the calling point should be about right, but you may have to change it.

Exterior:Lights,
  RainWaterPump,
  [...],
  Rain Water Pump; !- End Use Subcategory


EnergyManagementSystem:Actuator,
  RainWaterPump_ElecPower_Override,      !- Name
  RainWaterPump,                                     !- Actuated Component Unique Name
  Exterior:Lights,                                       ! Actuated Component Type
  Electric Power;                                        ! Actuated Component Control Type

WaterUse:Storage,
   RainWaterTank, !- Name
   [....]

EnergyManagementSystem:Sensor,
  RainWaterTank_OutletFlowRate_Sensor, !Name
!- Name
  RainWaterTank, !                                     !- Output:Variable or Output:Meter Index Key Name
  Water System Storage Tank Outlet Volume Flow Rate; ! !- Output:Variable or Output:Meter Name

EnergyManagementSystem:ProgramCallingManager,
  Initialize EMS for Run , !                         !- Name
  AfterPredictorAfterHVACManagers ,       ! !- EnergyPlus Model Calling Point
  Model_RainWaterPump;                 !        !- Program Name 1

EnergyManagementSystem:Program,
  Model_RainWaterPump ,         ! Name
  IF RainWaterTank_OutletFlowRate_Sensor > 0,
    ! ### IMPLEMENT PUMP POWER CALC HERE, assuming 30 ft of head and 0.5 total pump eff ###
    SET RainWaterPump_ElecPower_Override =  RainWaterTank_OutletFlowRate_Sensor * 89,672 / 0.5,
  ! This IF/ELSE statement is useless here (if flow is zero, power is zero), but I wanted to show the syntax
  ELSE,
     SET RainWaterPump_ElecPower_Override = 0.0,
  ENDIF;

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object or not.

Here's a completely untested, written on the fly and manually (problems/typos expected), EMS snippet. I think the calling point should be about right, but you may have to change it.

Exterior:Lights,
  RainWaterPump,
  [...],
  Rain Water Pump; !- End Use Subcategory


EnergyManagementSystem:Actuator,
  RainWaterPump_ElecPower_Override,     !- Name
  RainWaterPump,                                    !- Actuated Component Unique Name
  Exterior:Lights,                                       ! Actuated Component Type
  Electric Power;                                       ! Actuated Component Control Type

WaterUse:Storage,
   RainWaterTank, !- Name
   [....]

EnergyManagementSystem:Sensor,
  RainWaterTank_OutletFlowRate_Sensor, !- Name
  RainWaterTank,                        !- Output:Variable or Output:Meter Index Key Name
  Water System Storage Tank Outlet Volume Flow Rate; !- Output:Variable or Output:Meter Name

EnergyManagementSystem:ProgramCallingManager,
  Initialize EMS for Run ,                         !- Name
  AfterPredictorAfterHVACManagers ,       !- EnergyPlus Model Calling Point
  Model_RainWaterPump;                        !- Program Name 1

EnergyManagementSystem:Program,
  Model_RainWaterPump ,         ! Name
  IF RainWaterTank_OutletFlowRate_Sensor > 0,
    ! ### IMPLEMENT PUMP POWER CALC HERE, assuming 30 ft of head and 0.5 total pump eff ###
    SET RainWaterPump_ElecPower_Override =  RainWaterTank_OutletFlowRate_Sensor * 89,672 / 0.5,
  ! This IF/ELSE statement is useless here (if flow is zero, power is zero), but I wanted to show the syntax
  ELSE,
     SET RainWaterPump_ElecPower_Override = 0.0,
  ENDIF;

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object or not.

Here's a completely untested, written on the fly and manually (problems/typos expected), EMS snippet. I think the calling point should be about right, but you may have to change it.

Exterior:Lights,
  RainWaterPump,
  [...],
  Rain Water Pump; !- End Use Subcategory


EnergyManagementSystem:Actuator,
  RainWaterPump_ElecPower_Override,     !- Name
  RainWaterPump,                         !- Actuated Component Unique Name
  Exterior:Lights,                       ! Actuated Component Type
  Electric Power;                        ! Actuated Component Control Type

WaterUse:Storage,
   RainWaterTank, !- Name
   [....]

EnergyManagementSystem:Sensor,
  RainWaterTank_OutletFlowRate_Sensor, !- Name
  RainWaterTank,                       !- Output:Variable or Output:Meter Index Key Name
  Water System Storage Tank Outlet Volume Flow Rate; !- Output:Variable or Output:Meter Name

EnergyManagementSystem:ProgramCallingManager,
  Initialize EMS for Run ,                         !- Name
  AfterPredictorAfterHVACManagers ,       !- EnergyPlus Model Calling Point
  Model_RainWaterPump;                        !- Program Name 1

EnergyManagementSystem:Program,
  Model_RainWaterPump ,         ! Name
  IF RainWaterTank_OutletFlowRate_Sensor > 0,
    ! ### IMPLEMENT PUMP POWER CALC HERE, assuming 30 ft of head and 0.5 total pump eff ###
    SET RainWaterPump_ElecPower_Override =  RainWaterTank_OutletFlowRate_Sensor * 89,672 / 0.5,
  ! This IF/ELSE statement is useless here (if flow is zero, power is zero), but I wanted to show the syntax
  ELSE,
     SET RainWaterPump_ElecPower_Override = 0.0,
  ENDIF;

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Outlet Inlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object or not.

Here's a completely untested, written on the fly and manually (problems/typos expected), EMS snippet. I think the calling point should be about right, but you may have to change it.

Exterior:Lights,
  RainWaterPump,
  [...],
  Rain Water Pump; !- End Use Subcategory


EnergyManagementSystem:Actuator,
  RainWaterPump_ElecPower_Override,     !- Name
  RainWaterPump,                        !- Actuated Component Unique Name
  Exterior:Lights,                      ! Actuated Component Type
  Electric Power;                       ! Actuated Component Control Type

WaterUse:Storage,
   RainWaterTank, !- Name
   [....]

EnergyManagementSystem:Sensor,
  RainWaterTank_OutletFlowRate_Sensor, !- Name
  RainWaterTank,                       !- Output:Variable or Output:Meter Index Key Name
  Water System Storage Tank Outlet Inlet Volume Flow Rate; !- Output:Variable or Output:Meter Name

EnergyManagementSystem:ProgramCallingManager,
  Initialize EMS for Run ,                         !- Name
  AfterPredictorAfterHVACManagers ,       !- EnergyPlus Model Calling Point
  Model_RainWaterPump;                        !- Program Name 1

EnergyManagementSystem:Program,
  Model_RainWaterPump ,         ! Name
  IF RainWaterTank_OutletFlowRate_Sensor > 0,
    ! ### IMPLEMENT PUMP POWER CALC HERE, assuming 30 ft of head and 0.5 total pump eff ###
    SET RainWaterPump_ElecPower_Override =  RainWaterTank_OutletFlowRate_Sensor * 89,672 / 0.5,
  ! This IF/ELSE statement is useless here (if flow is zero, power is zero), but I wanted to show the syntax
  ELSE,
     SET RainWaterPump_ElecPower_Override = 0.0,
  ENDIF;

You should be able to use EnergyManagementSystem to do this:

Create an exterior equipment. I think you'll need to use Exterior:Lights here, because it has an actuator called "Electric Power", Exterior:FuelEquipment doesn't look it has one. See source: ExteriorEnergyUse.cc#L316^[1] . Set the Exterior:Lights End-Use Subcategory to "Water Pump" or whatever you want in order to have the right reporting in your eplustbl.htm.
Add an EMS Sensor for your flow rate, probably capturing the WaterUse:Storage's output variable Water System Storage Tank Inlet Volume Flow Rate [m3/s] (ref here)
Declare an EMS Actuator for your chosen Exterior equipment's Electric Power.
Write an EMS program that will compute the power used by the pump based on the flow rate given by the EMS Sensor.

Debug, look at outputs.

I hope it helps.

^[1] You could make sure: try with Exterior:FuelEquipment, request the EMS actuator dictionary (see here), check if there is indeed an actuator for this object or not.

Here's a completely untested, written on the fly and manually (problems/typos expected), EMS snippet. I think the calling point should be about right, but you may have to change it.

Exterior:Lights,
  RainWaterPump,
  [...],
  Rain Water Pump; !- End Use Subcategory


EnergyManagementSystem:Actuator,
  RainWaterPump_ElecPower_Override,     !- Name
  RainWaterPump,                        !- Actuated Component Unique Name
  Exterior:Lights,                      ! Actuated Component Type
  Electric Power;                       ! Actuated Component Control Type

WaterUse:Storage,
   RainWaterTank, !- Name
   [....]

EnergyManagementSystem:Sensor,
  RainWaterTank_OutletFlowRate_Sensor, !- Name
  RainWaterTank,                       !- Output:Variable or Output:Meter Index Key Name
  Water System Storage Tank Inlet Volume Flow Rate; !- Output:Variable or Output:Meter Name

EnergyManagementSystem:ProgramCallingManager,
  Initialize EMS for Run , Model_RainWaterPump_CallingManager,                         !- Name
  AfterPredictorAfterHVACManagers ,       !- EnergyPlus Model Calling Point
  Model_RainWaterPump;                        !- Program Name 1

EnergyManagementSystem:Program,
  Model_RainWaterPump ,         ! Name
  IF RainWaterTank_OutletFlowRate_Sensor > 0,
    ! ### IMPLEMENT PUMP POWER CALC HERE, assuming 30 ft of head and 0.5 total pump eff ###
    SET RainWaterPump_ElecPower_Override =  RainWaterTank_OutletFlowRate_Sensor * 89,672 / 0.5,
  ! This IF/ELSE statement is useless here (if flow is zero, power is zero), but I wanted to show the syntax
  ELSE,
     SET RainWaterPump_ElecPower_Override = 0.0,
  ENDIF;