Be designed at a minimum, to retain the first inch of runoff on site and provide a zero increase in the peak rate of runoff from the site for the twenty-five-year storm, with an evaluation of the impacts from a fifty- and 100-year storm. After the evaluation is complete, if a larger design storm is warranted as determined in consultation with the Town Engineer, the applicant shall design the drainage for no net increase in the runoff from the 100-year storm.