Even if you had a main drain available, you would not be allowed to drain the area into it. During dry periods, it would allow sewer gas out of the dryed up trap, and during rainy weather it would act as a storm drain, something not allowed unless the sewer system is set up as combination sanitary/storm drain. A French Drain allows the water to seep into the soil, but that is what it should do anyway, unless the ground is impervious to seepage or too water logged In which case French drains would not work either.