The 2010 ada and 2009 ansi mandates that an operable part of an accessible element must be reachable either through a forward approach or a side approach.
Ada sink depth side approach.
No more than one bowl of a multi bowl sink shall be required to provide knee and toe clearance complying with 306.
4 24 5 clear floor space.
4 2 6 side reach if the clear floor space allows parallel approach by a person in a wheelchair the maximum high side reach allowed shall be 54 in 1370 mm and the low side reach shall be no less than 9 in 230 mm above the floor.
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Knee and toe space is required below drinking fountains lavatories and sinks dining and work surfaces and those sales and service counters that provide a forward approach.
Is it the depth of the counter that we care about.
Sinks used primarily by children ages 5 and younger shall not be required to provide knee clearance if clear floor space for a parallel approach complying with 4 2 4 is provided.
The dip of the overflow shall not be considered in determining knee and toe clearances.
A parallel approach complying with 305 shall be permitted to lavatories and sinks used primarily by children 5 years and younger.
Each sink shall be a maximum of 6 1 2 in 165 mm deep.