Walkway Clearing Crew Time and Service Window

A WALK CREW IS TWO OPERATIONS RUNNING AT ONCE -- open walk by blower or sidewalk machine, and steps, landings and entrances by hand -- AND THE CREW TIME IS THE LARGER OF THE TWO, NOT THE SUM. The crew is done when the slower operation is done, which makes the split between machine work and hand work the whole design of the crew. Adding a second blower to a route that is waiting on its shovellers changes nothing; adding a shoveller changes everything. Crews are commonly sized by habit rather than by balancing the two, and the symptom is a machine operator standing at the end of the walk waiting. WHICH OPERATION GOVERNS IS COMPUTED HERE RATHER THAN ASSUMED, and that matters because the common intuition is not reliable. Depth penalises both operations, and whether hand work or machine work fails first depends entirely on how each rate falls: a blower slows because it can only ingest so much snow per pass and deep snow forces a slower walking speed or a second pass, while a shoveller slows because each scoop is heavier and the lift is higher and beyond a certain depth the work becomes throwing rather than pushing. Enter the two depth factors and the arithmetic names the governing operation; a crew balanced at four inches is frequently not balanced at twelve, and it is not always the shovellers who go first. SERVICE LEVELS ON WALKS ARE A LIABILITY QUESTION as much as an operational one, which is why they are written as hours after the storm ends rather than as an effort. A route that comfortably meets its window in a routine event can miss it by a wide margin in a heavy one, and the crews needed follows directly. AND THE MATERIAL IS COUNTED PER APPLICATION, NOT PER STORM. A walk that was cleared and then refroze is a different and worse condition than one that was never cleared, so re-application through a long event is part of the same commitment -- and it is the part most often left out of both the material order and the labour estimate. This is a crew sizing estimate on entered figures. Production rates must come from the contractor's own timed records: they vary enormously with snow type and moisture, walk width and surface, the number of doorways, steps and obstacles, where the snow can be thrown, the equipment and the crew, and a rate from one property does not transfer to another. The depth factors are entered and illustrative rather than measured. It treats the two operations as perfectly parallel and independent, which they are not -- crews interfere, share transport between properties, and lose time moving between them, and on a route of small sites travel commonly exceeds the clearing time. It does not address the sequencing of properties within a route, which is what actually determines whether any individual site meets its window, or the staffing, call-out and fatigue constraints of a multi-day event. It does not address ice melt selection or its effectiveness at temperature, or the accessibility requirements that govern which routes and entrances must be cleared and to what width. It takes no position on slip and fall liability, documentation, or the service contract's own definitions. The contractor's own production records, the applicable accessibility requirements, and the service contract govern.

machine time = open walk area / (blower rate x depth factor); hand time = hand area / (shovellers x hand rate x depth factor); the crew time is the LARGER of the two, not the sum; crews = crew time / service window, rounded up; ice melt = area / 1,000 x the rate, PER APPLICATION.

The parallel-operation crew time convention. Production rates and depth factors are ENTERED from the contractor's own timed records.

Two rate divisions and a maximum.

Estimate. AHJ and licensed professional govern.

Field names used by the API: total_area_ft2, hand_area_ft2, blower_rate_ft2_hr, hand_rate_ft2_hr_person, crew_size, service_window_hr, blower_depth_factor, hand_depth_factor, icemelt_lb_per_1000ft2, applications, open_area_ft2, blower_hr, hand_hr, crew_hr, crew_min, crews_required, icemelt_per_application_lb, icemelt_event_lb

• Perfectly parallel operations crews interfere, share transport, and lose time between propertiesthe contractor's own records
• Rates and depth factors are entered illustrative rather than measured; they do not transfer between propertiesthe contractor's timed records
• Travel between sites is not counted on a route of small sites it commonly exceeds the clearing timethe route plan