How Much Rain Per Square Foot
Size downspouts to fit the gutter. These are safe numbers meaning designed to work under the strongest rainfall not the average for your area.
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If that area gets a rainfall of one inch that would accumulate to 3630 cubic feet ft³ of rainwater falling on this acre.
How much rain per square foot. Consequently a rainfall of 1 inch over 1 acre of ground could mean a total of 6272640 cubic inches of water. During shorter and cooler spring or fall days we recommend using about half that amount. Every square foot of roof space collects.
This calculation assumes a 90 efficiency. In the form below choose an areas and a rainfall amount to see how many gallons of water fell from the sky onto that area. For example on a 2000 square foot roof you can collect 2000 x 056 1120 gallonsinch of rain.
Using that rate a 32 sq ft bed requires 20 gallons of water per week. This is the equivalent of 3630 cubic feet. The square footage of a roof is the same whether it is pitched or flat.
1 of Rain on 1000 sf Roof will Yield 623 Gallons. If nature hasnt supplied water as rain apply approximately 1 inch of water a general rule of thumb. So for each inch of rainfall your roof could collect 1246 gallons of.
The chart below shows rainfall in inches during each 15-minute increment on Dec. A round downspout is slightly more efficient in draining water than square. To figure out the square footage of a surface multiply the width x length.
So multiply 623 gallons by the number of surface square feet of your roof. Rainfall amounts are usually measured in millimetres and inches. In this example 600 x 240 x 1 144000 cubic inches of water Divide by 231 to get the number of gallons because 1 gallon 231 cubic inches.
You may be able to undersize based on these charts and be fine 90 amount of the time but if you never want to worry better to be safe than sorry. Rainwater Collection Calculation Formulas and Equations. One inch of water or rain is equivalent to 623 gallons per 1000 square feet.
Roof area the locales rainfall intensity and gutter capacity determine how many square inches of downspout are needed. After youve found the square footage multiply it by 056 to determine how many gallons you can collect per inch of rain. 32 sq ft x 0623 gallons per sq ft 20 gallons per week.
Due to gravity water tends to flow down into the soil. Roof Area m2 X Precipitation Amount mm Amount Collected liters. Click to see full answer.
For a homeowner of a 1500 square foot home the average cost to purchase and install new gutters is 957 to 4473 for 160 feet of gutters or 614 per linear foot depending on the type of gutter installed. For a rough estimate of how much water your garden requires use 5 gallons of water per 8 square feet. Rainwater can be collected from the roofs using the rain water harvesting method.
While an inch of rain doesnt sound like much an inch of rainfall covering a garden that is 20 x 10 200 square feet is equivalent to approximately 125 gallons of water. 24 th and the continuous measure of streamflow in cubic feet per second ft 3 s. Dont forget to ask for a gutter color match to the existing trim on your home.
This will give deep penetration of the soil to a depth of 6 to 8 inches. Water should be applied no faster than the soil is able to absorb it. Roof Area ft2 X Precipitation Amount in X 0623 Amount Collected gallons Easy Formula to Remember.
To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. Herein how many gallons are in an inch of rain per square foot623 gallons. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area.
An acre of ground contains 43560 square feet. Take the dimensions of the footprint of your roof and convert them to inches. So a 50 x 20 roof is 600 x 240 Multiply the roof dimensions by the number of inches of rainfall.
M --- METRIC --- pm nm microns µm mm cm km -- IMPERIAL -- mil 116 inch inches feet yards miles - SCIENTIFIC - Planck Bohrs Angstrom light-seconds light-years au parsecs --- OTHER --- points cubits fathoms rods chains football fields furlongs Roman miles nautical miles leagues. 24 2002 about two inches of rainfall fell in the Peachtree Creek watershed. In our example it would be 623 x 2000 which equals 1246.
Meaning you can capture about 62 gallons per sq ft. 6 gallons of water in a 1 inch rainfall. Just multiple the square footage of roof space you have available X 06 gallons per square foot per inch of rain and you can see how much water you can collect from each inch of rain that falls.
Rainwater Collection Calculator in Gallons. A square inch of downspout can drain 1200 square feet of roof during a rain with an intensity of one inch per hour. An inch of rainfall on a square foot of surface area yields 623 gallons.
Doubling the number of downspouts halves the required capacity for each. Permeable Area Needed to Absorb the Rainwater. An area of an acre has a square footage of 43560 sq ft.
So if you have 2500 square feet of roof available for water catchment and a single inch of rain falls one day we see that. This calculator will calculate the amount of water from a rainfall amount measured in inches per acre. I think youll be surprised about much rain.
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