How To Determine Acre Feet Of PondQuick Answer: How Big Is An Acre Pond. For example, a pond that is 450 feet around the shoreline would have an area = (450 feet)2 / 547,390 or 0. ponds with: adequate depth (10-12 feet), sufficient size (half acre or larger), controlled watersheds, and undesirable fish populations. Once you have these sizes use the calculation method below to measure your pond water volume. Determine the size of your pond with our pond size calculator then view our recommended stocking rates Serving All Your Pond Lake Management Needs. The expense for a small project is usually $2. In the diagram shown here, the equation would be: 260 feet x 408 feet = 106,080 square feet 106,080/43,560 = 2. Knowing how many acre-feet you're going to create by building a pond of a specific depth and surface size is essential to determine if the pond will supply enough irrigation water or space for fish. An Example: The pond length is 850' and the pond width is 400'. Length of Pond Width of Pond Equation 4-18 Potential for biofouling Degree of long-term maintenance and performance monitoring Infiltration rate reduction factor Ponds Trenches Low Average to high High single-event hydrographs where, Atrench is the wetted area of the trench sides and bottom Equation 4-15 (1. The total volume, then, of the pond is 1. Pond Discharge Worksheet days MGD acre-feet MG Pond 2 Pond 1 Pond 3 Pond 4 ft ft acres = acre-feet feet times times Number of days to end of first discharge equals minus minus equals divide by Step 1 - Calculate Storage Needed Step 2 - Calculate Storage Available Step 3 - Calculate Total Volume Needed to Discharge Step 4 - Calculate Total Feet. 10 feet x 500 feet = 5,000 square feet 5,000 square feet * 43,560 (square feet in an acre) The average depth of water in this shoreline is 1 foot. 50,000 square meters is equivalent to 12. Ponds close to Ardmore, Oklahoma, generally need 8 to 16 acres of watershed per acre-foot of pond volume. Also include the total head which is the height differential between the surface of the water and the highest point of your pond tubing or outlet, ie: waterfall outlet. This metric can now be converted to calculate . See Figure 7 for profile through principal spillway of the facility. Area, Square Feet ; Area, Acres ; Total Acre Feet Feet = ; Lake Volume, Gallonsme, Gallons ; ESTIMATING LAKE VOLUME. California receives about 193 million acre-feet of water each year as precipitation (rain. than 25 acre-feet of water at the top of the dam, or. 48 = Total gallons available at the skimmer faceplate. A measurement of the diameter in several directions will help to determine if the pond is truly circular. How to Calculate the Proper Aeration Required for Your Large Pond or Lake:. Use the volume calculator to calculate the volume of a pond in litres or gallons. Pond Calculator App – for pond management – fish farming. A recreational fishing pond should have a maximum pond depth that ranges between 5 and 10 feet. An acre is equal to 43,560 square feet. Calculate pond size, the number of gallons, max fish capacity, liner size, and tons of boulders for your water garden. For ACREAGE of a circular area, multiply the Length (in feet) by Width (in feet) = Square Footage. If you already know the acres but want the area in other units, use our acreage unit conversion tool. Continue to click along the outside edge of the shape you want to calculate the area of. For Example: If the pond is 15 feet long by 10 feet wide by 2 feet deep, the pond's volume is 300 cubic feet. Rotenone and other chemi-cals are applied based on the “acre-feet” of water present in a pond. Measure the length in feet and the width in feet with the tape measure, then measure the depth in feet with a dip stick if your pond is a square or rectangle . · (L x W x 80%) x average depth x 7. If you're not sure of the average depth of your pond, use 6 feet. You can be extra cautious and do 2 square feet of surface area per inch of fish as well. As a general rule, you will need at least 3 acres of land draining into the pond for each acre-foot of pond volume. How Many Gallons of Water in a Pond?. For example, a circular pond with a radius of 75 feet has an area of 17,663 square feet (3. Divide the diameter (in feet) by 2 to get the radius. An acre-foot is a unit of volume having an area of 1 acre and a depth of 1 foot. If you don’t find the exact size, always go to the next larger size – in this case – ½ acre. We will map your pond for free! Simply fill out the information here or give us a call at 866-766-3435. Reach the 20-acre threshold and the cost drops to about $2,000 per acre. Surface Area Calculator For an Oval or Irregular Shaped Pond - Acres. To determine how many acres your pond is divide your value for surface area by 43560 (the number of square feet per acre) Depth Diffusers placed… Which Type of Aeration System is Right for My Pond …well as a decorative piece. STEP 2 - Select Option to Calculate: Pond Volume Calculator. 2m wide and about 40cm deep, you would then do the following using . An acre-foot is a volumetric unit; it is equal to the volume of water required to fill one acre with exactly one foot of water. Take the Length X Width of the pond if square or rectangular, or Length X Width X. For Those Interested, One acre of water, one foot deep is called: one acre foot and technically it is 325,850 gallons. Determine the surface area of the pond in acres. This article provides a method of determining the volume of . How many gallons is my pond?. Determine the number of acre feet of water to be treated. Enter the land length (in feet) in the space below the first box. acre-feet MG Pond 2 Pond 1 Pond 3 Pond 4 ft ft acres = acre-feet feet times times Number of days to end of first discharge equals minus This form is provided as an aid for the stabilization pond operator to calculate the amount of treated wastewater to discharge in order to provide the approximate storage needed for the upcoming summer or. Also Know, how many koi are in a 300 gallon pond? A good rule of thumb is 500 gallons for each adult koi. There are 1000 liters in a cubic . Find the volume, in acre-feet, of a pond that is 700 feet long, 400 feet wide and 5 feet deep. Then multiply this the average water depth (feet) x 325,851 gallons/acre foot. Understanding that it would be unreasonably difficult to calculate the depth for each individual square foot of your pond, it’s probably adequate to estimate the average depth and. 1 acre = 43,560 square feet · 1 acre-foot = 1 surface acre 1 foot deep, or 43,560 cubic feet · Total volume in acre-feet = surface area (acres) x average depth ( . Step off or measure the length and the width of your pond in feet. Rectangular Pond: 7 X 11 = 77 sq. 23 acres discharging into a wet detention pond comprised of: • 3,000 linear feet of roadway: ⁻two 12-ft lanes ⁻two 6-ft paved shoulders ⁻20-ft grassed areas (both sides of road) draining via sheet flow • 5 acres off-site drainage area (no existing impervious area) • Pre developed Tc = 45 minutes. This metric can now be converted to calculate pond volume. 25 gallons or approximately 102. The stocking options listed below are for ponds in the Upper Midwest (e. To design the correct aeration system it's important to know the acreage, dimensions and volume of your. The liner calculator will work out the size of liner required based on the ponds dimensions. 115 acres x 1 foot (average depth) = 0. How To Calculate Your Pond's Surface Acres 1. Therefore, to calculate (US) Gallons, Multiply the Cubic Feet Result by 1728 t Get Cubic Inches, and then divide that by 231. - Find the area of a shape you draw on a google map. One step should equal about 2-1/2 feet. Pond volume is measured in acre-feet of . 5 = ___ gallons) If your pond basin has a conical depth profile (see below) and is circular in shape, you can also calculate the pond volume by using a formula for the volume of a cone:. Using these calculations will help you determine the surface area and volume that your pond occupies. Every 90 degree plumbing elbow and T-fitting will also add about 6 inches of head to the equation. We have added an easy chart guide attachment with different pond depths to help you check your water volume. To determine the organic load of a pond, you should perform this calculation:. Rectangle shaped pond: Length (feet) x Width (feet) divided by 43,560 = surface acre. You need to figure the square feet of surface area in your pond. How Much Water Does A Pond Lose To Evaporation?. Depending on evap and seepage rate you will probably need another source to fill the pond and perhaps the spring could supplement the evap & seepage to maintain full pool levels. If your pond falls in between round and square, adjust the formula to calculate acre feet. 1 acre is equivalent to 43,560 square feet and the amount of bentonite to effectively seal a 1 acre pond is between 125,000 and 250,000 pounds of bentonite. This tool allows the user to quickly and easily calculate the surface area of any shaped pond and then calculate the number of acre feet, all without having . Tie one end of the rope to the stake and then secure the stake into the ground at the corner of the longest side of your pond. It is equal to 325,851 gallons. If it’s a uniform 3’ deep all across, you’re looking at 130,680 cubic feet. An acre foot of water is equal to one acre of water one foot deep which equals 328,000 gallons or 2,720,000 pounds. For a larger-scale project (up to 10 acres), expect to pay $3,000 to $8,200 per acre or more. How to calculate the volume of your pond in gallons. 5 acres determine the minimum drainage area required. Sizing Requirement Guidelines: CALCULATE LAKE SURFACE AREA A) Multiply the length of the lake (in feet) by the width of the lake (in feet) to get the square feet of the surface. Route the inflow hydrograph through the detention pond (initial volume = 23. Also enter the amount of overlap required per side of the liner if any. How long does it take to fill a 1 acre pond?. Get a Quote Here 2 Acre Pond >>> Between 125 and 250 tons of bentonite. The result equals the volume of your pond . Square the shoreline distance and divide by 547,390 to get the pond area in acres. 16 surface acres Irregular Shaped Ponds – There are many methods to calculate irregularly shaped ponds. To determine surface area, take the measurements of the longest width . So multiply 850' x 400' = 340,000' (the total). Use the following calculators to determine the size or volume of your pond. Determining the acreage of a pond will be necessary to calculate the pond volume. So to calculate the volume of the sloped area with a 2 to 1 slope that would have to be subtracted from the total volume (measurements in feet) you could use (40 + 80) x (a x 2a). Larger bodies of water typically use "acres" as the unit of measure for surface area. right is usually limited to a specific volume of water described in terms of acre-feet (ac-ft), acre-inches (acin), or cubic feet- per- -second (cfs), and limited to a specific beneficial use, such as agriculture or domestic uses. Most ponds are not perfect squares or circles so when you use the pond. times 12 inches per foot equals 120 inches of runoff needed to fill the pond. Verify with HCFCD, some areas require higher rates. This tool allows the user to quickly and easily calculate the surface area of any shaped pond and then calculate the number of acre feet. 5 where L is the Length in Feet, W is the Width and Feet and D is the Depth in feet. Using this formula and Google Earth Pro will give you a much more accurate . The volume of water in the pond (in acre-feet) is . A common method is using the formula to calculate the area of a trapezoid. To calculate the pond water volume use this easy method below. Then divide by 43,560 to determine the size of the land in acres. One of the most common problems in pond management is over-estimation of pond size. Each acre-foot equates to 325,851 US gallons of water so multiply acre-feet by 325,851 to determine fluid gallons. These can be in metric units (centimeters or meters) or imperial units (yards, feet or inches). 3 Ways to Calculate Acreage.Use of Rotenone for Management of Fish Populations. Acre-Feet (volume): If your pond is rectangular to egg-shaped, multiply its length in feet by its width in feet, then divide that figure by 43,560. Certain fish species require total hardness levels above 50 ppm for good health. Check that the V wq release rate does not exceed 5. Say in July, you want to have the pond filled and you only get 4 inches of runoff after the trees and grass soak up the water. Avoid including too much watershed acreage as excess waterflow is undesirable. The radius is half the diameter ( . A pond in extreme eastern Oklahoma might need only 2 acres of watershed per acre-foot of pond volume, whereas a pond in the extreme western Oklahoma Panhandle might need 75. Can you over filter a pond? As far as the health of your fish are concerned, over-filtering is not really. Find the depth of this pond along the top row (16’). Triangular pond areas are esti-. The following charts are provided for your quick reference. 5 pounds of lime per acre-foot of water (one acre of water that is one foot deep) will increase the total alkalinity approximately 1 ppm. This link is excellent density information for your pond. The average pond depth can be calculated as the average of all of these measurements. Pond pumps are sized by GPH at one foot of lift or height. I need a pond for livestock watering. To calculate areas for ponds that are not perfectly square or rectangles, adjust the formula . For Pond Water Volume in Litres Measure the Length, Width and Depth of your pond in metres. So, a pond that measures 150 feet long and 100 feet wide would have an area = 150 feet X 100 feet = 15,000 ft2 or 0. Now plug the values into the formula to determine the pond area in acres: Pond Volume in Acre-Feet. If you are trying to figure out GALLONS, . How many feet is a half acre pond? Calculate Pond Volume. Module 19: Treatment Ponds and Lagoons Answer Key. This number is the acre feet of your pond. Multiply the length times the width to get the square feet of surface area. What is the expected fishing pressure?. How To Choose the Right Size Pond Pump Fountain or Aerator. For example, if your pond measures 21,780 ft², it would be 0. You can use the Acre Calculator to find the square footage in a property that has uneven lengths or widths. Pond Pump Calculator Calculate the volume of water that the pump must be able to cycle every hour. Calculate large pond volumes in acre-feet and small ponds in. How many fish should be in a 1 acre pond?. An acre foot of water is a common way to measure water volume and use. For example, if you want to treat brood fish before. Try our length conversion tools, if needed. If the acreage of the area to be treated is known, the number of acre-feet can be determined by multiplying the number of acres by the average depth (average depth = 1/3 of the maximum depth). Example: for a pond that is 100 feet long by 50 . Divide that figure by 27 to get cubic yards. Check with the local land management office to make sure you can build a pond on your properly legally. Obviously, a 6’ deep pond will be twice that. Volume, ft 3 = 700 ft x 400 ft x 5 ft. How do you calculate gallons in a koi pond?. Plant erosion control plants such as sturdy grasses, trees, and shrubs. Did you ever want to know how much water is in your favorite fishing lake? Why folks in the water world use “acre feet” instead of gallons?. Remember to keep accurate records of your measurements. Determining the acreage of a pond will be . Irregular Shaped Pond: 7 X 11 X. An average California household uses between one-half and one acre-foot of water per year for indoor and outdoor use. Therefore, the very first step in determining the right size of pond for your The key point here is that the acre feet of every pond is . To determine the acre-feet, multiply the surface area of the pond by the average depth. Taking the time to determine the total alkalinity of your pond, as well as the average depth, will help ensure you are using a copper sulfate treatment that is. The acre-foot is a unit of volume commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, sewer flow capacity, irrigation water, and river flows. Click the button that has the shape of your pond to quickly get to the calculator that you need. 55 ac-ft at a pond depth of 3 feet, as determined in Step 3) to generate an outflow hydrograph. Measure the Radius (1/2 the diameter) of the pond x Radius x 3. How many gallons are in a 1 acre area of 1' of water?. Multiply this product by the depth in feet to find the cubic feet of water. The Water Budget must define the pond storage requirements in acre-feet at. NOTE: Rather than measuring with a tape measure, step off the distance. One acre-foot is the volume of water sufficient to cover an acre of land . Example: Find the area, in acres, of a pond that is 700 feet long, 400 feet wide and 5 feet deep. What dimensions is an acre?. It is equal to exactly 43,560 cubic feet, . An acre is 43560 square feet so half an acre is 43560/2 = 21780 square feet. Calculating Flow Rate and Head Height for Fountain and Waterfall Pumps. For example, a parcel that is 70 feet wide but has a length of 160 feet on one side and 140 feet on the other is calculated in two steps. · Take depth measurements spaced uniformly over the . Ponds Trenches Low Average to high High single-event hydrographs where, Atrench is the wetted area of the trench sides and bottom Equation 4-15 (1. Determining Pond Volume The first step in effectively poisoning the existing fish population is to determine the volume of water to be treated. Calculating Depth Figuring out your pond's depth is a bit trickier, particularly if you have plant shelves or if the pond has a slope. An easy way to grasp its size is to know that the volume of an acre foot would sit comfortably within a football field. How Many Gallons Is My Pond? To calculate gallons in pond instructions. Then divide Square Footage by 43,560 (amount of square feet in 1 acre) = Acreage. Multiply the length number times the width number. Enter an address or zoom into the map then click on the starting point of your shape. To convert from acres to square feet, multiply your figure by 43560. The average price to install a pond ranges from $1,220 and $5,480, with most homeowners paying around $3,321. “An acre-foot is a volumetric unit, it is equal to the volume of water that it would take to fill one acre with exactly one foot of water” On occasion a pond can exceed the 200-acre-foot limitation if its 12-month average is at or below the 200 acre-foot level. A pond in extreme eastern Oklahoma might need only 2 acres of watershed per acre-foot of pond volume, whereas a pond in the extreme western Oklahoma Panhandle might need 75 acres of watershed per acre-foot of pond volume. Recommended Stocking Rates per acre, of fingerling-size fish for new or . 14 x R2 (feet) divided by 43560 = surface acre. Calculator for the Approximate . What is the volume of my pond?. 115 acres-feet If we assume that 4 gal/acre-foot was the recommended dosage, then 0. An acre foot can also be defined as an area of water 660 feet X 66 feet X 1 foot depth. Every pond owner should know the water volume of his/her pond. Copper sulfate is a valuable tool available to catfish farmers for treating problematic algae blooms in ponds. Ponds are measured by acre, much like any other type of land, but they're also rated by a measurement known as an acre-foot. Knowing the size of a pond is critical for just about every pond management decision. 0 acre‐feet/acre of area to be developed. average depth) exceeds 50 acre-feet. 55 acre‐feet/acre of area to be developed. The result equals the volume of your pond in "acre-feet. However, you may choose to circulate the water once every 2 hours. Determine the Number of Acre-Feet in Your Pond to Calculate the Amount of Herbicide Needed. Usually, herbicides are applied on a per-acre or per-acre-foot basis. 14 x pond radius squared x average depth = ___ cubic feet To convert from cubic feet to gallons, multiply by 7. As a general guide, you can determine whether fertilization may be For ponds of 3 acres or less, a platform with 9 square feet of . For irregular shapes, split your pond into sections, calculate each one, and then add them together for total size or volume. Generally speaking, the watershed area should be about 4:1 (4 acres of watershed to 1 acre of pond or lake). Rectangular or Square Pond – Length x Width / 43,560. To calculate the total volume of your pond, you must first measure the dimensions of your pool. Use half of that depth, or two feet, for your formula. First, calculate the volume in cubic feet: Volume, ft 3 = Length x Width x Depth. If your 1/2 acre plot of land is a square with area 21780 square feet then each side is of length √21780 feet. After that, multiple that number by the depth. pond shape can be estimated by measuring the distance around the pond shoreline in feet. The deeper you go into the pond the less oxygen, so with this mind 10-12 feet would be adequate. An acre-foot is a unit of volume having A I-acre pond with an. Assume the pond is 320 feet in diameter and averages 8 feet deep. All we need to know is the ponds radius. Aquashade can be applied at various rates: 20 fl. The average one acre pond with a depth of eight feet that stays full all summer with fresh water can generally support 300 trout. Multiply the radius of the pond by itself and then by 3. If you know how to calculate pond pump size, so you can decide whether you need the 50 gph pond pump or the 3000 gph pond pump, whichever fits perfectly into the picture of your pond. The ideal pump assures the health of your pond, keeping it fresh and clean, as well as the lives of the fish that live inside the pond. So 50,000 square yards is equivalent to 10. Example: Find the volume, in acre-feet, of a pond that is 700 feet long, 400 feet wide and 5 feet deep. 5 tons of bentonite, so you'll need between 3 and 5 truckloads of bentonite to fully seal the pond. This can be accomplished utilizing many different methods, generating the outflow based on the specific. Wooded, highly vegetated areas and certain soil types will divert or intercept rainfall. 48 gallons of water, so multiply 300 by 7. In the diagram shown here, the equation would be: 260 feet x 408 feet = 106,080 square feet. Liming is recommended for ponds with a total alkalinity of less than 20 ppm. An acre foot of water equals about 326,000 gallons, or enough water to cover an acre of land 1-foot deep. Another method that is readily accessible and very accurate is to download Google Earth on your computer. To give you an idea, each full truckload of bentonite contains 22. To put it another way, an acre foot of water is enough to flood a football field 1-foot deep (a football field is roughly an acre in size). 6 (gallons per acre foot) = Acre Feet Helpful Chart for Choosing the Right Size Pond Pump You can always go with a larger size if you want to really make a statement, as long as you have enough water depth and it falls within your budget. On occasion, a pond can exceed the 200 acre-foot limitation if its 12-month average is at or below the 200 acre-foot level. the size of pump you need, first calculate the volume of water in the pond. This value can be converted to acres by dividing by 43,560 ft2/acre. 1 Acre Pond >>> Between 63 and 125 tons of bentonite. do not · If you do fertilize So here is how you figure it out: · THE FORMULA: 1. To determine how much water your pond will hold when it is full you need to calculate: The surface area of the pond; . For example, a 30-acre drainage area requires a permanent pool volume of at least 54,000 cubic feet or 1. Grab your marked string, the weight, something to write with, and a boat or canoe. General Fish Stocking Recommendations. • A pond NOT built on a stream Wetland presence is determined by:. The following chart can help you know how much bentonite pond sealant is required per square foot of area to be sealed. how to build a lake in your backyard. The radius can be measured di-rectly or the diameter can be di-vided by 2. Example Detention Sizing Using the Volume. of oxygen per horsepower per hour. Divide the square footage by 43,560 square feet/acre to convert to acres. (An acre-foot is just what it sounds like - the volume of water contained in an acre of water that is 1 foot deep. Divide that figure by 27 to get the amount to be subtracted. Divide that total number by 43,560*. After clicking on the first dot a box with “total area” will display on the bottom of your screen. To determine the acre-feet of this pond, divide the cubic feet by 43,560 and there is 12. 25 acre pond with a 6' average depth. per acre-foot of water body volume. For additional background, review pond seepage loss information . B) Divide the surface area (in square feet) by 43,560 to get the number of surface acres. If the pond is fed by runoff, each acre of pond requires 10-12 acres of watershed (generally undeveloped land). depth discharged (feet) x pond size (acres) x 326,000 gallons per acre-feet. If the pond is 15 feet long by 10 feet wide by 2 feet deep the ponds volume is 300 cubic feet. Rectangular or square shape area is estimated by simply measuring the length and width of the pond sides in feet. The pond volume is calculated on the average pond depth formulated for pump circulation once an hour. For a 2-feet deep pond, 1 foot of depth equals . Larger bodies of water typically use “acres” as the unit of measure for surface area. Please enter all values in feet and decimals of feet (i. For example, if your parcel of land is 50,000 square yards you can determine its acreage by dividing 50,000 by 4840. 14 (Pi) then divide by 43,560 (square feet per acre). When dimensions are measured in feet, the products of these formulas are expressed in square feet. Is 120 acres enough to fill a 4 acre pond? I would want the 4 acre pond to have a max depth of at least 25 feet to control winter kill (northern . 5 acre pond with an average depth of 4 feet would be 2 acre-feet or 651,702 gallons. Check pond classification assumption: Height = 332-320 = 12', equals assumed embankment height, Pond will remain a Low Hazard. How do I calculate lot size to acres?. Determine the size of your pond with our pond size calculator, then view our recommended stocking rates Serving All Your Pond & Lake Management Needs Since 1972 800. To design the correct aeration system it’s important to know the acreage, dimensions and volume of your. If you prefer Crappie, you should consider digging your pond at a maximum recommended depth. This refers to the amount of water required to cover an acre of pond space in a one-foot deep layer of water. Use the following formulas to help you. The most common conversion of Q to V r is expressed in acre-feet: V r. Determine how deep you want the pond to be. However, static head and losses also need to be taken into consideration. 1 square foot = 144 square inches (12 x 12) · 1 acre = 43,560 square feet or 6,272,640 square inches (43,560 x 144) · 1 inch of rain falling on 1 square foot = . Most applications require some knowledge of the pond (size, depth, etc. 5 where L is the Length in Feet, W is the Width . Q (watershed runoff in inches) is determined from the CN plot using the 24-hr rain depth associated with the design storm. The volume of water in the pond (in acre-feet) is calculated by simply multiplying the pond area (in acres) by the average pond depth in feet. To calculate acres by hand, multiply your length and width (in feet) to get square feet. By multiplying these together, you get the acre-feet for your pond. Calculate Proper Aeration. The chart is based on water depths of up to eight feet. Crappie like going to deeper water in the warmer months as where bass and bluegill will prefer the top half of the water column. Finally, to determine the "acre-feet" of your pond, multiply the surface area in acres by the average depth in feet. If you decide on a 1 to 1 slope, use (40 + 80) x. Calculate how many gallons of water are available to put in transition before the water level in the lower pond is drawn down below the skimmer opening. Example You are treating a large sports turf complex and would like to determine how many lb of a 16-8-8 fertilizer should be applied per acre if the recommendation calls for 0. These pond and lake volume calculators help take the guesswork out of designing an effective aeration system. A circular pond 4 feet deep and 20 feet in diameter has a. How to Measure Your Pond for an Aeration System. Both are units used to measure volumes of water, typically for use in irrigation. 5 x B) X H = surface area * Odd-shaped – Measure your pond in sections using the calculations above or use a handy online tool like Bing Maps. For pond size calculation, there are two main measurements to know about your pond: surface area (acre) and volume (acre-feet). How do you build a 1 acre pond? How to Make a 1 Acre Pond. Diffusers placed in deeper depths are more efficient aeration for ponds; so understanding your pond depth is important to make sure you correctly size an aeration system. Check that the V pp is at least 1800 cubic feet per acre that drains to the pond. The formula used to calculate the volume of water depends on the shape of your pond. " For example, if your pond is one surface acre with a 4-foot average depth, you would have 4 acre feet of water (1 x 4 = 4 "acre-feet").