The developer shall provide a drainage plan to the City for review and approval by the City. The drainage plan shall identify and contain all of the following:
(a) The location of the development site and water bodies that will receive storm water runoff. Storm water discharges shall outlet within the same drainage basin or district where flow originates and generally may not be diverted to another drainage basin/district
(b) The existing and proposed topography of the development site, including the alignment and boundary of the natural drainage courses, with contours having a maximum interval of one foot (using USGS datum). The information shall be superimposed on the pertinent Ionia County soil map.
(c) The development tributary area to each point of discharge from the development.
(d) Calculations for the final peak discharge rates.
(e) Calculations for any facility or structure size and configuration.
(f) A drawing showing all proposed storm water runoff facilities with existing and final grades.
(g) The sizes and locations of upstream and downstream culverts serving the major drainage routes flowing into and out of the development site. Any significant off-site and on-site drainage outlet restrictions other than culverts should be noted on the drainage map.
(h) An implementation plan for construction and inspection of all storm water runoff facilities necessary to the overall drainage plan, including a schedule of the estimated dates of completing construction of the storm water runoff facilities shown on the plan and an identification of the proposed inspection procedures to ensure that the storm water runoff' facilities are constructed in accordance with the approved drainage plan.
(i) A plan to ensure the effective control of construction site storm water runoff and sediment track-out onto roadways.
(j) Drawings, profiles, and specifications for the construction of the storm water runoff facilities reasonably necessary to ensure that storm water runoff will be drained, stored, or otherwise controlled in accordance with this chapter.
(k) A maintenance agreement, in form and substance acceptable to the City, for ensuring maintenance of any privately-owned storm water runoff facilities. The maintenance agreement shall include the developer's written commitment to provide routine, emergency, and long-term maintenance of the facilities and, in the event that the facilities are not maintained in accordance with the approved drainage plan, the agreement shall authorize the City to maintain any on-site storm water runoff facility as reasonably necessary, at the developer's expense. Such agreement shall be signed prior to issuance of construction permits and shall be recorded on the deed for the property for perpetual maintenance.
(l) The name of the engineering firm and the registered professional engineer that designed the drainage plan and that will inspect final construction of the storm water runoff facilities. Should a storm water system, as built, fail to comply to the City's design and performance standards, it is the developer's responsibility to design and construct at his or her expense, any additional and/or alternative storm water management facilities. Such additional facilities shall be subject to approval by the City of Ionia.
(m) All design information must be compatible for conversion to City of Ionia Geographic Information System (CIGIS).
(n) Any other information necessary for the City to verify that the drainage plan complies with the City's design and performance standards for drains and storm water management systems.
(Ord. 07-2002-10. Passed 7-2-02.)