No building permits shall be issued for any structure in the City until provisions have been made to provide for secondary storm sewers to drain all subsurface and foundation drains in compliance with the following:
1. Sanitary Sewers - Prohibited Discharge. No person shall discharge or cause to be discharged any storm water runoff, surface or ground water, roof runoff, or subsurface drainage by a direct or indirect connection into the sanitary sewer system for any new construction within the area served by the City. Prohibited subsurface drainage shall include both interior and exterior foundation drains into the sanitary sewer system.
2. Foundation Drain Discharge - Alternative Methods. All foundation drains shall be disposed of in one of the two following alternative methods:
A. Sump Pump. A sump pump shall meet the provisions of the International Residential Code, when applicable, or the International Plumbing Code. Notwithstanding the provisions of Section 901.2.1 of the International Plumbing Code, in single-family dwellings, sumps of approved construction to which no fixtures except one floor drain are connected, and which receive only laundry wastes or basement drainage, need not be vented.
B. Alternative Method. Upon submission of plans and specifications to the City Engineer and/or Building Official by any developer for an alternate method of disposing of said waters which can be shown to be as effective as the above, then said proposed method shall be allowed by the City Engineer and/or Building Official.
3. Secondary Storm Sewer Details. Secondary storm sewers shall be constructed in accordance with the following:
A. Design and Materials. Discharge from footing drains and sump pumps must be discharged into a secondary storm sewer system or alternative drainage way as approved by the City Engineer and/or the Building Official. Piping for secondary storm sewer system shall be PVC pipe with thickness of SDR Series 35, or thicker, with joints capable of pressure loadings for periods when all sump pumps may be operating simultaneously. The secondary storm sewer system shall be located in the same manner as the normal storm sewer location unless it can otherwise be shown that a different location is advantageous and acceptable. It shall be equipped with an approved flap valve at the discharge end and shall have a sealed lid manhole at the upper terminus.
B. Capacity. The line shall be so designed as to accommodate the required flows based upon the assumption that:
(1) With one-half of the sump pumps pumping at 20 gpm (average 10 gpm per residence) the secondary storm sewer will handle all flows by gravity with pipe flowing full with velocity of minimum 2 fps;
(2) With all sump pumps pumping (each at 20 gpm) the velocity in the secondary storm sewer system shall not exceed 10 feet per second and the friction loss shall not exceed 5 feet per 100 feet of pipe; and
(3) That the minimum size shall not be less than 4”;
(4) House connections shall be a minimum 1 ½” Schedule 40 PVC water pipe.
C. Flow Design Standards. The conditions of flow design for both gravity flow and pressurized flow shall be as per the following chart entitled “Friction Loss Characteristics of Water Flow Through Rigid Plastic Pipe”. Typical results are as follows:
FRICTION LOSS CHARACTERISTICS OF WATER FLOW THROUGH RIGID PLASTIC PIPE | |||||||
Pipe
| Min. Velocity Flowing Full-ups | Min. Slope at/100 | Q at Min. Slope gpm | H1 Controls at 5' per 100p | Q at H1 Controlling gpm | V Controls at 10 fps | Q at V Controlling gpm |
FRICTION LOSS CHARACTERISTICS OF WATER FLOW THROUGH RIGID PLASTIC PIPE | |||||||
Pipe
| Min. Velocity Flowing Full-ups | Min. Slope at/100 | Q at Min. Slope gpm | H1 Controls at 5' per 100p | Q at H1 Controlling gpm | V Controls at 10 fps | Q at V Controlling gpm |
1½" Sch. 40 | 2 | 1.2 | 12 | Yes | 28 | No | ---- |
2" Sch. 40 | 2 | 0.85 | 19 | Yes | 53 | No | ---- |
4" DR 25 | 2 | 0.37 | 82 | Yes | 350 | No | ---- |
6" DR 25 | 2 | 0.23 | 178 | No | ---- | Yes | 910 |
8" DR 25 | 2 | 0.18 | 295 | No | ---- | Yes | 1490 |
10" DR 25 | 2 | 0.14 | 470 | No | ---- | Yes | 2400 |
Sump pump should deliver 20 gpm against operating head of 35 feet (or 15 psi) based upon a 50- foot long discharge line and 450 feet of secondary sanitary sewer, figuring 25 feet of line loss, 5 feet of lift, and 5 feet of loss through valves and fittings. | |||||||
4. Elevation and Material to be Used for Footing Drains. Drain materials and elevation of piping shall meet the provisions of the International Residential Code, when applicable, or the International Plumbing Code. Such piping shall be placed with two (2) inches of bedding underneath and twelve (12) inches of washed gravel or crushed rock over with an approved filter membrane and shall be acceptable to the Building Official and subject to review by the Building Official.
5. Method of Installing Secondary Storm Sewers and Service Lines. With respect to installation of PVC SDR 35, or thicker, secondary storm sewer systems, all regulations that apply to the laying of PVC water main and service lines shall also apply to the laying of PVC secondary storm sewer and service lines, including depth and cover.
6. Installation of Footing Drain Service Lines Into Standard Storm Sewer. In instances where standard storm sewer is available for the connection of 1 ½” PVC Schedule 40 service lines, the Schedule 40 service lines shall be connected to the storm sewer by drilling a hole in the concrete storm sewer pipe of a diameter only slightly larger than the outside diameter of the service pipe, then place the service pipe through the storm sewer extending the end of the service pipe to, but not past, the interior wall of the storm sewer. The storm sewer shall be entered in its mid point or above with these footing drain service lines. The ditch shall be filled under, around and over the PVC storm service pipe with stone or gravel to form a firm base under the PVC in the open ditch between where the PVC pipe comes out of unexcavated natural ground and the wall of the storm sewer pipe; all in a manner acceptable to the engineer.
7. Occupancy Permit. No occupancy permit shall be issued for any building or structure within the City that is not in compliance with this section.
8. Site Plan Detail. All site plans must provide details showing compliance with this section for the proposed system of Secondary Storm Sewer.
9. Illegal Acts. It shall be unlawful for any person to cause a violation of this section. A person who is the owner of any building or structure shall be responsible to cause that building or structure to be in compliance with this section. Any inhabitant or occupant of any building or structure shall be responsible to cause that building or structure to be in compliance with this section.
10. Continuing Violation. Each day that a violation of this section occurs shall be deemed to be a separate violation.
11. Mandatory Connection. At such time as the Community Services Director decides there is adequate storm sewer or secondary storm sewer capacity available for the property owner to connect to, the Community Services Director shall inform the property owner in writing and allow said property owner ninety (90) days to install and connect a sump pump to the lines. If the property owner fails to comply, the Community Services Director shall hire a qualified plumber to complete the job and the costs shall be assessed to the property. Secondary storm service lines shall be installed in compliance with Section 157.23 of this code.