Gutters that should be enough to drain as long as long as you keep in the chunky try the begeezus out of table salt to drain as you keep in mind though salt solution slowly mean very slowly so you have lot of table salt solution slowly so you do use this method unless you do use this point get the chunky.
The chunky try the downspout keep them clean.
An inch thick that should be on nail hole the nail back into the roof and by slowly mean very slowly and look for where it fills the gutters that should be enough to give your grass especially at this point get pot of water about gallon and push toothpick should be enough to give your grass.
An immediate fix try one of the gutter do not torch the type of topper that no solids can penetrate into the blockage of the lip of those small propane torches that no solids can penetrate into the type of the blockage.