1. Every building hereafter erected with a basement as defined in Section 202 (IBC) and R202 (IRC) of the International Building Code and International Residential Code shall have a subsoil drainage system placed under the basement floor, with plans as approved by the Building Official, or surrounding the outer walls of the building with the tile invert set a minimum of eight (8) inches below the elevation of the basement floor. Such subsoil drainage system shall discharge the water therefrom into a receptacle located inside the foundation wall. Such receptacle shall terminate at least eighteen (18) inches below the tile invert of the drainage system and shall be at least sixteen (16) inches in diameter. Such receptacle shall extend upward to the surface of the floor.
2. Materials for the drainage system shall be made of open jointed, horizontally split, or perforated clay tile, or perforated bituminized fiber pipe, asbestos pipe, or perforated rigid, formadrain, or corrugated plastic pipe, not less than four (4) inches in diameter. The receptacle or sump shall be made of concrete pipe or a material approved by the Building Official and a pump of suitable capacity shall be provided.
3. Construction of Drainage System. Subsoil drainage tile shall be installed on stable soil with coarse gravel backfill, size one-half (½) inch to two and one-half (2½) inches over the tile, or other material approved by the Building Official. The joints of open tile shall be covered with an asphalt-saturated felt paper. Gravel backfill shall be placed over and around the tile and extend to not less than one foot above the tile.
4. Discharge of Subsoil Water. The subsoil water collected by the subsoil drainage system shall be lifted by the use of a sump pump and shall be discharged outside the foundation wall. The discharge of the subsoil water may be into a natural waterway, a storm sewer or a sump drain tile. A connection will be required where a storm sewer or sump drain tile is available within 25 feet of the property line and no street cutting is required. The discharge pipe shall be of one and one-half (1½) inch rigid pipe and, if connected to a storm sewer or sump drain tile, shall contain a check valve or a positive check so as to prevent any storm waters from backing into the sump. Seasonal diversion of sump pump discharge to irrigation or other use is permitted. When the subsoil drainage system is so installed as to provide natural discharge by gravity, the sump pump will not be required.
A. Required Inspections. The Building Official, upon notification from the permit holder or agent, shall make the following inspections and shall either approve the subsoil drainage system or shall notify the permit holder or agent wherein the same fails to comply with this Code.
B. Subsoil drainage inspections shall be made before the excavated areas are covered. If the subsoil system is to be drained by natural gravity, the Building Official may require water to flow through the system as proof that the system is working properly.
C. The combining of subsoil or footing drain lines with any other storm drainage lines, except as herein provided, such as lines from roof drains or parking lot drains, is prohibited.
D. All connections of sump drain tile with storm sewer or discharge pipes with storm sewers must be made by the use of a tapping saddle approved by the Building Official.
E. Subsoil water shall not drain into the sanitary sewer system.
If subsoil water is present in existing buildings, draining into the sanitary sewer, the City Engineer or Building Official shall require such drainage system as may be deemed adequate to eliminate water from draining into the sanitary sewer.