As a result, the northern ice cap becomes dusty and less reflective. So that it absorbs more sunlight and warms up to melt the ice. The polar caps are not the largest reservoir of water. We can't accurately quantify the reservoir. However, much more water is bound beneath the surface of Mars in the form of permafrost.
Water freezes completely in the outer solar system.
We have the technology to perform this process. The time it takes to move them onto Mars is around 25-50 years. 10 years of steady thrusting and 20 years coast to impact. When the object hits Mars, it will create a big impact. As a committee, we don't really consider this process, because we don't know how destructive the impact is.