Urine MAY be a humectant or a substance that falls within someone's definition but I can assure you peeing on your lawn will not make a happy lawn.
Have you ever noticed on your underfed lawn, big green patches from female dogs peeing on their walkabout? On your lawn? Has nothing to do with moisture, everything to do with urea.
Urine is acid. Lawns need more alkaline soil. Fact.
People actually drink urine! Their argument is that they were told Urine is sterile?? That our urine has cool stuff in it that our bodies need? Yet the very same bodies excreted that same Urine? Crazy.
Urine is in no way a product to use on soils for plants and soil life. Period. Look up our stuff on lawn care. Lawns are a curious and needy crop that if we do not understand its needs we will not have beautiful lawn.
We humans have artificial gardens. Everything we touch is artificial. Plants need our input with water, light and fertilizer...drainage. If we do not understand the basics we will only incur more problems and feel less success and control when we step out our doors of our homes.
Cape Town is in S. Africa? Urine does more harm than good when applied full strength. Have you seen green green well fed lawns where female dogs have peed and instead of dark green those spots are fried? Too much nitrogen. Simple.
You need to get your lawn on a fertilizer program. If you've got warm season grasses for lawn, the healthier your grass the better it is able to out compete weeds and resist disease. If you are seeing greening on your lawn from urine that tells me your lawn is starving from lack of chemistry it needs to make its own food. That lawn needs a balanced fertilizer 3 to 4 times per grow season, aeration by pulling plugs out of the lawn and leaving them to disintegrate...
The absolute best decomposed mulch that feeds the soil life is decomposed human poo and sawdust. The best. Beautiful. Fine texture, dark taupe. You have to replace it every other year because the organisms in the soil come up and eat this stuff then go back into the soil to poop it out mixing the organic matter into the soil perfectly and quickly. Forget about weeds...no weed seeds no pesticide residues...but a little high in heavy metals (still lower than our tap waters) so not for use on vegetables...check out your local poo processors!
The only and the best way to improve any type of soil, anywhere, is by dumping DECOMPOSED organic matter on the surface of the garden soil. (Potting soil ONLY for pots). Not one other thing has been found to improve the texture, tilth of soil. Not one. Some use gypsum, some lime, others gravels, pea gravels, some like making layered lasagna, none of these things makes a great soil. None. Lime, gypsum, gravels, clay, water and rotation make...concrete.