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In general, there is a concave line at the bottom of the exterior window sill, designed to prevent rainwater from flowing into the wall. The rainwater will fall outside this line, which is known as the drip line. It is applicable in construction projects where there are requirements to block dripping water. The drip line (or groove) is typically created at the bottom of the window lintel. If the concrete surface is very smooth, a "roughening treatment" should be performed on its surface. The drip line prevents rainwater from flowing down the wall and entering the balcony or flowing onto the glass. It is usually made at the junction of the bottom surface and the exterior wall, approximately 1-2cm away from the corner, creating a groove about 1cm wide. This way, the water is intercepted and will not flow inward. It is applicable in construction projects with requirements for blocking dripping water. Such locations include protruding exterior wall features like window sills, window heads, non-protruding window tops, awnings, balconies, parapet caps, and protruding waistlines on exterior walls. All these areas should have a drip line (or a drip groove can also be created).