Think of the plant as any living creature, so it needs to breathe. Allowing water to drain from the pot prevents water from backing up into the pot and "drowning" the plant.
water and soil
Flowers need water because the water provides important nutrients to the plant.
To properly plumb a washer drain, you need to connect the washer's drain hose to a standpipe or a laundry sink. The standpipe should be at least 18 inches high and have a P-trap to prevent sewer gases from entering your home. Make sure the drain hose is secured in place and not kinked to allow proper drainage. Additionally, ensure that the drain pipe has a proper slope to allow water to flow freely.
Yes, sandy soil allows water to drain quickly because of its larger particle size and low water holding capacity. This can be beneficial for some plants but may also lead to quick nutrient leaching and the need for more frequent watering.
Someone may need a drain camera if they have lost something of value down a drain, for example a ring. Another reason a drain camera may be required if there is a plug in the drain sewer that one cannot break, and it will allow them to see where the problem is in the drain.
To get water to it, and to have it drain
One your Goldenrod flower are established, they do not require much water. They are drought tolerant and get most of their water from the rain.
Assume you're describing the condensate drain tube??? If it becomes plugged with crusted mud or dust that got wet and stuck to the tube, there can be a point that the tube won't drain properly. You may need to get under the vehicle, find the tube and run a small, flexible wire or other object up the tube to allow the condensate to drain. Once you get it open enough to drain, it might be a good idea to run a small tube up the drain and allow a little water, under low pressure to irrigate the drain tube.
you need to know the PITCH of the drain line to give an proper answer
If you only recently became plagued by a water hammer, you probably don't need to do anything more than turn the water off and drain your lines. Let the water drain out at the lowest drain in the house. If you don't think you have all the water drained, you can open all the drains and suck the water out with a wet-dry vac. Sometimes the air traps loose their air. They look like a dead-end pipe extending upwards from a tee and that air acts as a shock absorber. Draining the lines will allow that water to drain out and restore the function.
NO
for a shingled roof you need 4in per footEnough pitch to allow water to flow to the internal leader (drain) or scupper or outside leader by gravity