Which requires more water? A cut or uncut lawn?

Question

I'm trying to conserve water and only have a fraction of my yard covered with grass. I got to wondering if long grass consumes more water because there's more biomass to serve, or if cut grass consumes more because it's been cut.

Answer 1

During hot Summer days it is best to keep your lawn a bit longer to prevent the heat from burning the roots ,therefore raise your cutting blade a bit , if your grass is short it will require more water to stay green .  

Answer 2

I think longer grass retains moisture. Shorter grass requires more water to keep it green.  

Answer 3

Generally, a cut lawn has more evaporation and the cutting stimulates new growth, so more water is required.  If you cut your lawn, leave the clippings to provide a mulching effect and return nitrogen back to the soil.

Answer 4

a cut lawn.