Any property that is newly developed, or any existing developed property that is being expanded or modified, is required as part of the Building Permit process to submit an engineered lot grading and site servicing plan. The plan must show geodetic building elevations, lot elevations, and typical drainage patterns.
Engineered stormwater runoff calculations must also be submitted to demonstrate that the City’s stormwater runoff requirements are met.
Engineering companies preparing commercial lot grading and site servicing plans for submission to the City of Steinbach must be pre-qualified by the City.
Engineering companies that are not currently pre-qualified, but wish to submit plans, must apply in writing and provide the following information:
If, in the City’s opinion, the company appears qualified to complete the work, it may be permitted to undertake the work on a probationary basis.
To obtain a list of pre-qualified companies, or for more information about this process, please email engineering@steinbach.ca.
Roof drainage and surface runoff from commercial lots must be controlled in a manner satisfactory to the City so that the maximum runoff rate entering the City’s storm drainage system is no greater than it would be if the site were developed as residential property. For the purpose of this policy, the average residential lot is considered to have an imperviousness of 35%.
All Rational Formula runoff calculations must be based on a 2-year storm event using:
Surface runoff coefficients are to be as follows:
While the allowable total runoff from a site is restricted to a 2-year storm event with an average site imperviousness of 0.35, any required on-site storage areas must be sized to contain the runoff volume generated by a 25-year storm event, using an intensity of 5.01 in/hr for 15 minutes.
