Section 16.02.14.292 - DRAIN GRATINGThe main drain outlet grating must:
01.Area of Openings. Have an area of openings four (4) times the area of the discharge pipe or provide sufficient area so the maximum velocity of water passing through the grate will not exceed six (6) feet per second;02.Maximum Width of Openings. Have grate openings with a maximum width of not more than one-half (1/2) inch; and03.Securely Fastened. Be securely fastened in such a way that they cannot be removed without the use of tools.Idaho Admin. Code r. 16.02.14.292