Solenoid Valve will not open
Unless the 9V battery is a Lithium cell, Alkaline will not last very long driving a load of 9V  @ 240 mA (from datasheet) or about 37.5 Ohms.

The 9V battery internal resistance with 6 tiny 1.5V cells in series is in the 5 to 20 Ohm range which makes a 9V Alkaline a poor choice for this application with only ~500mAh capacity or 0.5Ah= 0.5A*9V = 4.5Wh.

From the solenoid specs of 4.8W at 12V that  with each application of about 4 watts for 10 seconds resulting in 40 watt-seconds giving you maybe 400 pulses of life.  But battery capacity decreases with rising current due to losses. 

If the solenoid was on all the time, it might yield 1 if it is a good industrial Panasonic Alkaline fresh battery and you had sufficient water pressure for flow.


If not then it wont work at all.


It is best to use a small DC water pump than a solenoid. given you don't have enough pressure nor enough voltage or current with a suitable sized or use a proper DC supply with suitable waterproof and rodent proof cable insulation.