We also have a little man-made pond - that my son dug out with his own hands -, which only fills up a couple of times a year. Today is one of those days. I sent you a picture of it as well.
I hope you follow my example and start collecting the rain water that is legitimately yours: it fell on your roof, didn't it? Where will it be going if YOU don't keep it? Who will eventually either take it for themselves (Arabs digging illegal wells into the aquifers, or USAID in Bani Naim), or sell it to you at a profit ( Mekorot from the Kinneret, etc)? Don't give our enemies a chance to deprive you of your deserved greenery , fruits and vegetables. The slogan always seems to be "WATER RATIONING" these days: WHO SAID IT HAS TO BE SO?? Why cooperate with people who don't have your best interest at heart?
So keep the water, use it for your gardening needs, indoor plants, or whatever purposes brackish water can be used for, and ENJOY!