Snowmelt test

Home Depot Employee · August 2006

Well if you get one inch of rain, that doesn't mean that if it were falling as snow, you would have one inch of snow. There is a conversion to determine "___ amount of rain equals ___ amount of snow". This conversion is not always the same, because air temperature plays a big role in this as well. When the air is near freezing, there is a lot of water content to the snow and 10 inches of snow could melt down to one inch of rain. However, if the air is very cold, and you have a powdery snow, it may take as much as 25 or more inches of snow to melt down to one inch of rain. Below is the conversions that you would use based upon the temperature. These conversions are all based on "____inches of snow melts down to one inch of rain."

TEMP (F) RATIO (SNOW:RAIN)
35 7:1
29 - 34 10:1 (Our snow falls 99% of the time between 25 & 35 degrees, thus making it very wet, 15:1 or 10:1 ratio)
20 - 28 15:1
10 - 19 20:1
0 - 9 30:1
<0 40:1

Troy_3 · August 2006

Snowmelt test

OK here goes- How many gal. of water are created over a 2000sq. ft. snowmelt parking area with a 10" snowfall?

Ron Schroeder · August 2006

Now thats a big Depends

As there is more water content in heavy wet snowfall than in a light fluffy snowfall.

Home Depot Employee · August 2006

Well if you get one inch of rain, that doesn't mean that if it were falling as snow, you would have one inch of snow. There is a conversion to determine "___ amount of rain equals ___ amount of snow". This conversion is not always the same, because air temperature plays a big role in this as well. When the air is near freezing, there is a lot of water content to the snow and 10 inches of snow could melt down to one inch of rain. However, if the air is very cold, and you have a powdery snow, it may take as much as 25 or more inches of snow to melt down to one inch of rain. Below is the conversions that you would use based upon the temperature. These conversions are all based on "____inches of snow melts down to one inch of rain."

TEMP (F) RATIO (SNOW:RAIN)
35 7:1
29 - 34 10:1 (Our snow falls 99% of the time between 25 & 35 degrees, thus making it very wet, 15:1 or 10:1 ratio)
20 - 28 15:1
10 - 19 20:1
0 - 9 30:1
<0 40:1

Home Depot Employee · August 2006

Well if you get one inch of rain, that doesn't mean that if it were falling as snow, you would have one inch of snow. There is a conversion to determine "___ amount of rain equals ___ amount of snow". This conversion is not always the same, because air temperature plays a big role in this as well. When the air is near freezing, there is a lot of water content to the snow and 10 inches of snow could melt down to one inch of rain. However, if the air is very cold, and you have a powdery snow, it may take as much as 25 or more inches of snow to melt down to one inch of rain. Below is the conversions that you would use based upon the temperature. These conversions are all based on "____inches of snow melts down to one inch of rain."

TEMP (F) RATIO (SNOW:RAIN)
35 7:1
29 - 34 10:1 (Our snow falls 99% of the time between 25 & 35 degrees, thus making it very wet, 15:1 or 10:1 ratio)
20 - 28 15:1
10 - 19 20:1
0 - 9 30:1
<0 40:1

Home Depot Employee · August 2006

SORRY FOR THE KEYBOARD STUTTER

Brad White_9 · August 2006

Rule O' Thumb says

an inch of rain is 10 inches of snow, but as Bruce said, is it fluffy or is it slushy? Broom-worthy or break out the Bobcat?

Using the 10:1 ratio of snow to water, 2,000 SF an inch deep is 166.66 cubic feet x 7.49 gallons per CF = 22.25 gallons.

This is absolute volume, not a flow rate for drainage purposes. That is up to you.

Beats litres per hectare flowing at a rate expressed in furlongs per fortnight any day!

Snowmelt test

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