We will construct a drainage system along the entire right side, and the front of your home up to the fireplace.
The drainage system consists of two pipes in a rock filled trench. One is perforated, to collect sub-surface water and the other is non-perforated, to collect water from the roof downspouts. At the upper end or start of both lines, as well as at the major corners, a clean out will be provided so that both lines can be tested or cleaned as necessary.
The minimum depth for the perforated pipe will be below the grade of the soil under the house and both the perforated and non-perforated pipe will fall at least 1/8 inch per foot for the total length of the system to the point of discharge.
The perforated pipe will be installed on top of a bed of gravel, two inches deep, with the perforations pointed down. The trench will then be then backfilled with drain rock. The rock we recommend is Class I, Permeable Type A drain rock per the California State Specifications. The drain rock is clean gravel that varies in size from 1/4 to 1/2 inch.
The trench will be a minimum of 12 inches wide. This permits a four-inch blanket of rock on each side of the four inch perforated pipe.
The system will be excavated approximately 2 feet from the right side foundation, and a wedge of dirt between the trench shall be excavated and sloped toward the trench, then lined with plastic sheeting and backfilled.
The system will discharge through a 4-inch solid pipe across your front yard and beneath the public walk and through the curb on the right side of your driveway. The system will be excavated in reverse to maximize the depth while maintaining a minimum slope.
