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You are right agla, the soil is mostly clay. It is not very tight, but it does not drain as good as a loamy soil. What you say makes perfect sense. I might modify this system to make it more effective based on your information, or just elbow the PVC sideways and daylight it with another elbow facing towards the slope. I have a few feet of slope to play with. The patio area would be app. 50 sq. ft. at a slight incline (1/8"-1/4" /ft.), directing water towards the flower bed behind the retaining wall.
You did not comment on my other concern. If you have any suggestions on that, I am all ears.
Another picture. The retaining wall (with coping) and the front porch elevation would be level with the mid point of the existing cement porch. Coping and pavers on a bed of concrete sand would be installed on the existing cement porch.
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