We have a Built-in brick planter that came with the house - approximately 16 x 4 ft
the soil in the planter is clay - we want to get water from rain to evaporate (it doesn’t now) - our problem showed up when we lined the planter with plastic sheeting (against weeds) and filled the planter with river pebbles.
rain water or spillage from watering plants outside the planter just sits and does not evaporate - the pebbles are about The depth of a horizontal brick and a half
short of drilling holes in the brick mortar (which stains the patio when the water runs out) we cannot find a way to get the water to run off or evaporate
really would appreciate any help