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2) Patio Floor Drain is significantly below grade. It is also tied into the side sewer and is <br /> not protected by any check valve. Therefore, during a surcharge event this drain could <br /> experience a backu• from flows in the sewer system. <br /> - 41011,i, <br /> s i.` k�'' r„ Iry <br /> f � jk <br /> '3 r � rr <br /> Y <br /> di <br /> -.s e <br /> t , h I <br /> 1 <br /> S ;r — I <br /> �' R <br /> Te. n- ,-$ v� 1F t. .- M�yCK <br /> -� . !,,mot , . - _ ---..- <br /> Rear Patio floor drain. <br /> Solution A: Add sump pump system for drain. This solution allows area to drain during <br /> storm events where the sewer system is surcharged. <br /> Solution B: Install check valve on drain. This will keep sewage and other flows from the <br /> side sewer from backing up through the drain in a surcharge event. However, the drain <br /> will not be able to drain surface water from the area during a storm event and surface <br /> water could pond here and potentially flow into the house. <br />