Humidity - Dryer less humid climates will evaporate faster than humid areas. ft. = 29.2 gallons. Minimize evaporation losses by increasing depth and minimizing pond surface area. How do I calculate pond evaporation? Answer: I can't give a specific rate of evaporation. The corrected total evaporation is 425 mm x 0.75 = 318.75 or 319 mm (omit this step if you are using evaporation rates calculated by the Penman Formula). Now that it is filled to capacity, the spring is not keeping with evaporation and my pond is now roughly 7" or 8" low. Possible Numbers French's Waterscapes gives examples of ponds in the Midwest -- relatively hot and. The control evaporation rate of 6.0 Find more climbing adventure in Germany at the Baumwipfelpfad Schwarzwald in the Black Forest! = evaporation rate of farm pond (mm day-1) a = intercept on Y-axis b 1 to b z = respective partial regression coefficients and x 1 to x z = respective meteorological parameters. The amount of water evaporating will depend on several factors including; cloud-cover, shade over the pond, humidity, wind, and the specifics of the waterfall or fountain. Causing water levels to drop roughly 1 inch per week, evaporation is the most common cause of pond water loss. Evaporation Rates. :r<> local evaporation rate multiplied by the water-surface area r the bays, lagoons, reservoirs, lakes, ponds, and streams T !f,hin the subdivision. ORDERING PROCESS. In Florida, ponds should be at least 6 to 8 feet deep. (ii) Water requirement including various losses such as conveyance, seepage, percolation, evaporation, etc. v Agriculture Handbook 590 Ponds—Planning, Design, Construction Tables Table 1 Runoff curve numbers for urban areas 14 Table 2 Runoff curve numbers for agricultural lands 15 Table 3 Runoff curve numbers for other agricultural lands 16 Table 4 Runoff curve numbers for arid and semiarid rangelands 17 Table 5 Runoff depth, in inches 18 Table 6 I a values for runoff curve numbers 21 3. Humidity - Dryer less humid climates will evaporate faster than humid areas. Evaporation rate increased 32 and 92 percent when ponds were aerated for 24 hours with one and four Air-O-Lator aerators, respectively. As a result, measured pan evaporation rates need to be multiplied by a "pan coefficient" in order to obtain more accurate estimates of open water evaporation: Open water evaporation = pan evaporation × pan coefficient (Kp) For the same month, 10 evaporation from these lined. We like to see a turnover once every 12 to 24 hours. It can also increase water salinity significantly. 6 Current methods of covering arti cial reservoirs are too costly to use by poor, small-scale 7 farmers. The largest impact is dewpoints. 1.7% of village area). Humidity (or lack of!) I would agree with evaporation. The evaporation from the surface can be calculated as. The evaporation loss increased linearly with greater amount of aeration. The data are provide here as gridded one-degree latitude by one-degree longitude quadrangles that cover Texas. Dry and hot weather can increase evaporation another inch or two per week. or can be simply used as a decorative pond. Actual Flow Rate X .005 (sheltered) or .01 (exposed) = Average evaporation loss in gallons per day Pond Length X Pond Width X 1 (Rectangular) or .85 (Irregular) = Square Feet of Surface Area Square Feet of Surface Area X .62 = Gallons of water in 1" of your pond. This pond is moving 5000 gallons total per hour through your pump (s) every day. Pond water levels were monitored weekly during the summer from 1972 through 1974 to determine normal seepage rates. ENERGY (continued) • Estimating energy storage in water (Q t) can be more difficult than estimating soil heat flux (G)• Part of solar radiation may penetrate to great depths depending on the clarity of the water • Stored energy affects the evaporation rate • Example . These storage ponds can be used for stock watering, irrigation, fire fighting etc. Click "Calculate your Pond Pump" to reveal pump size for a 90 minute turnover. I felt that Playmobil Fun Park was very well-designed. wetlands, due to open water evaporation, are required. Soils measuring more than 1 m are ideal for the construction of farm ponds. If you live in Colorado you know that when the humidity gets up around 40 or 50% we feel sweaty! If the pond level drops for an extended time due to drought, the exposed sides may dry and crack, causing pond leaks when the pond refills. Evapotranspiration is water that is lost to the atmosphere via evaporation and plant transpiration, and it has a large impact on water availability. Average Evaporation Loss per day X 7 = Average Evaporation Loss per week in gallons Evaporation ponds are usually designed on the basis of estimates of annual net evaporation. always greater than those for the pond (Table 2). Monthly rates for the pan ranged from 20.3 mm. The rate of evaporation depends on factors such as cloudiness, air temperature and wind speed. Use this simple pond calculator to find the "surface acres" and "volume" of your pond or lake. This rate is equal to 3.36 feet. Leaky basins. The maps can be found at: E gross (mm) = 0.67 x Epan The net evaporative loss from the farm dam takes into account the amount lost due to evaporation and the amount gained from rainfall direct onto the dam surface. Now you put those numbers together by dividing the gallons per inch by the number of gallons you should be losing: 140/25 = 5.6. ft. x 7.4805 gal./cu. For the sake of discussion, the average evaporation rate in Texas is about 7 to 8 inches per month, varying from about 3 inches to 13 inches, depending on season and location. Expect some evaporation. There is a complicated formula for working out evaporation in your pond which is calculated on flow rate, pond size (width x length) and surface area but as far as we are concerned as long as your pond doesn't lose a lot of water and stays around the average of 25cm water loss per week in the summer months then that can be put down to water . Deep ponds have less evaporation loss than shallow ponds with the same water volume and often provide better water quality. Evaporation is the amount of water which evaporates from an open pan called a Class A evaporation pan. The liner calculator will work out the size of liner required based on the ponds dimensions. A salt evaporation pond is a shallow artificial salt pan designed to extract salts from sea water or other brines.Natural salt pans are geological formations that are also created by water evaporating and leaving behind salts. Before you begin the design and construction, or refurbishment of a farm pond in Kansas, it's important that you understand and comply with all permitting requirements. it should be noted that many of the rates suggested . The following federal and state agencies can assist you with the process. KDFWR has a new series of farm pond management . We are looking for a solution to reduce the high evaporation rate. Use the volume calculator to calculate the volume of a pond in litres or gallons. The histogram 96of the resampling that was used can be seen in Figure 5. It was found, within a 90% con dence interval, that 95the average evaporation rate can be reduced by at least 1.1 mm/day (18%). About Calculation Rate Evaporation Pond Groundwater should make up for losses from evaporation and normal seepage of water through the pond bottom. Evaporation losses are higher in some areas than others and vary from year to year and within the year. There is a complicated formula for working out evaporation in your pond which is calculated on flow rate, pond size (width x length) and surface area but as far as we are concerned as long as your pond doesn't lose a lot of water and stays around the average of 25cm water loss per week in the summer months then that can be put down to water . "Our fish like the fact they always have fresh water." Birnbaum and his wife, Angela, are constantly on the go - illustrated by the fact they hardly ever manage to answer the phone during the day. Evaporation ponds are a low technology solution for concentration management whereby brine is pumped into large ponds and water slowly evaporates via direct solar energy. 15´ x 1´ = 15 sq. All of the evaporation values in these tables represent estimates of expected evaporation occurring from a Class A pan …. The maximum loss of water from a pond due to evaporation can be expected on breezy, warm summer days with low humidity. Seepage between measurement periods was defined as the change in water depth minus pond evaporation plus precipitation. We now have a total evaporation of 100.85 gallons. It is normal to lose 2-3″ of water in a week from evaporation. From NOAA Technical Report NWS 34 Mean Monthly, Seasonal, and Annual Pan Evaporation for the United States . ft., x 1/12 ft. deep = 4 cu. Refill water is less than normally required to nourish regular lawn grasses. Pan Evaporation Basin leakage of about 0.5-1mm a day is considered acceptable (On-farm and community scale salt disposal basins on the Riverine Plain, 2000)Leakage rates of greater than 3mm a day reduce evaporation efficiency, and recovery of the leakage at these rates may become unmanageable. They are a widely used method of saline water management in the Middle East and Australia. But often we get 12% or even 7% humidity! Measurements are made by the addition or subtraction of a known amount of water, which then tells us how much water has evaporated from the pan. On average a pond will lose around 1 inch of water per week to evaporation. a low maintenance pond that provides good sport fishing, as well as fish to eat. You said the pond is in Texas, and evaporation varies from very high in a place like San Angelo and much lower in humid locations like Houston. The authors studied and conducted some experi­ ments related to the development of methods to con­ trol evaporation and percolation in small farm ponds for 2 years (1995-1996), based on experiments car­ ried out by Kobayashi in 1994 2>. In larger ponds up to 3 inches per week of evaporation is normal. 5000 x .5% = 25 gallons. The Texas Water Development Board compiles and provides monthly and annual precipitation and gross lake evaporation rates to support water resources planning in the state. Monthly evaporation rates for the pan were. The data are provide here as gridded one-degree latitude by one-degree longitude quadrangles that cover Texas. Don't misconstrue evaporation as leakage. g s = (34.5 kg/m 2 h) (1000 m 2) ((0.014659 kg/kg) - (0.0098kg/kg)) / 3600 = 0.047 kg/s. Garden ponds from 500 to 2500 gallons and larger usually only require small weekly watering. Thus, the 6-month water loss from this farm pond is . The evaporation from shallow lakes and moist soils is generally classified by one of the following equivalent names: free water surface . For a pond to lose ½" - 3/4" of water per day under certain extreme conditions is not terribly uncommon and probably no cause for alarm. The Thames Region has an exceptional requirement to estimate open water evaporation from gravel pits. Temperature - Higher temperatures will cause quicker evaporation than colder temperatures. Most studies related to cold weather evaporation have been concerened with snow rather than ice. (28.2) as follows: Where, is volume of exacavation (m 3); is the area of excavation at ground surface (m 2), is the area of exacavation at mid-depth point (D/2) (m 2); C is the area at the bottom of the pond (m 2) and D is the design depth (m). Evaporation rates were taken from the map of Kohler, ; T ordenson, and Baker (1959) ; the western part of which is •i nroduced in this report at a larger scale. Professional design is perhaps the most effective way to ensure that system design meets established goals for operation of an evaporation pond. Farm Pond Permit Requirements in Kansas. For a 20 hectare storage, this would amount to 460ML. This chart is based on low activity and splash. According to USGS, half of annual rainfall is […] It is important to understand the extent of evaporation losses, if we are to assess the efficacy of farm ponds. ures to preserve farm pond irrigation water as much as possible. 30.2 Evaporation Losses in Farm Pond Evaporation is the process by which water is converted from its liquid form to its vapor form and thus transferred from land and water masses to the atmosphere. Design and construct evaporation basins to minimise leakage of concentrated saline water. Seasonally used ponds may have low evaporative conditions during the period of intended use. This is especially true for ponds that have less than 10 acres of drainage area per acre of pond surface. For design and construction of earthen embankment in farm pond, the following data are required: 1. The Texas Water Development Board compiles and provides monthly and annual precipitation and gross lake evaporation rates to support water resources planning in the state. Pond liners are used primarily to prevent loss of water from storage ponds and dams. I can list different factors that affect the rate of evaporation though. About Rate Calculation Evaporation Pond . The greater the soil depth, the greater the depth of farm pond: a deeper pond will reduce evaporation losses. In Kansas, expect normal water evaporation from your farm pond. E net (mm) = E gross - R Total loss from the dam is calculated by multiplying the net evaporative loss by the surface area, Example All of the evaporation values in these tables represent estimates of expected evaporation occurring from a Class A pan …. • Timbercreek Farm (TCF) is a permaculture farm located near Charlottesville, Virginia. On Feb. 19, the U.S. Geological Survey (USGS) announced that it has mapped long-term evapotranspiration rates across the continental U.S. for the first time. Total evaporation for these months is 56+63+68+75+84+79 = 425 mm. It is a natural process and occurs when solar radiation falls on a water body. During storms, however, evaporation and evapotransporation are typically not significant compared to precipitation, discharge and infiltration, and are often not considered. Factors such as location, time of year, pond size and especially weather, can affect the rate at which evaporation occurs. In addition, simply enter the gallons of water in your pond or lake and our calculator will tell you how many times per day each aeration system will turn your pond over. The heat supply required to maintain the temperature of the water in the swimming pool can be calculated as considered. After years of study in ponds across the country, state fisheries biologists recommend a stocking combination of largemouth bass, bluegill, and channel catfish as the best choice for warmwater ponds. They also had other things to play on, as would any playground. The average 6-month evaporation rate for shallow ponds is 40.3 inches for CD-7, where Jackson County is located. We have large farm pond at Bhavnagar District of Saurashtra region. Evaporation tends to lower water level in a pond or wetland over time, and evapotranspiration acts to dry out the soil before the next storm. Irrigation System Efficiency The last component in determining the monthly gross irrigation requirement (GIR) is irrigation system efficiency, shown in Figure D, where: ET c = crop ET P e = effective precipitation E irr = irrigation system efficiency The GIR is the amount required to be supplied from the pond for full irrigation. The gross lake evaporation rate is defined as water loss caused . hio farm ponds provide important recreational, domestic, and ag-ricultural uses that range from fishing, swimming, and wildlife . ft., x 1/12 ft. deep = 1.25 cu. And continued to gain water throughout last summer due to a good spring running into it, finally filling up completely in the fall. The data was analyzed by statistical package designed for data analysis on computer. A pond can provide extra income, serve as a water source for livestock, help with fire protection and attract numerous species of wildlife. Heat When the heat rises you may see an additional inch or two of pond evaporation. Calculation of annual evaporation rates requires estimates during periods when the surface may be frozen. Increasing evaporation reduces water volume and can concentrate contaminants. There is high evaporation rate from the surface of the water. To calculate evaporation losses, multiply the water surface area (in m 2) by the corrected evaporation rate (in m) for the length of time your pond will be in use. However, evaporative losses could approach 6 inches per month during the summer. This can increase the evaporation rate of a pond. 1. It can range from about 4 feet per year in the eastern part of the state to about 6 feet per year in the west. The volume of water likely to lost through evaporation and seepage, plus about 10% more to adjust some unforeseen water losses from the pond, is also added to determine pond storage capacity. I can list different factors that affect the rate of evaporation though. You could be losing two metres of water from the storage surface to evaporation if you live in the Moree district and held water in your farm storage for 12 months. The pond surface area is 70 yards by 70 yards, which is about one acre. In the current Learn about your evaporation rates and compare those rates to your pond's loss. From NOAA Technical Report NWS 34 Mean Monthly, Seasonal, and Annual Pan Evaporation for the United States . There are many contributing factors that play into how much water will evaporate from your pond. pond size, which is determined by the pond surface area, side slope, and depth. Determine the catchment area of the farm pond to satisfy the required storage. Keep in mind that 1 acre, 1 inch deep is 27,000 gallons of water. Most evaporation occurs during summer, especially in hot, dry, windy periods. Pan Evaporation Surface Area Excessive seepage from farm ponds is a serious problem in several areas of Missouri. "That means we get a flow rate of 60 litres per second," explains Birnbaum. Search: Pond Evaporation Rate Calculation. 1 Reducing Evaporative Water Losses from Irrigation Ponds 2 Through the Re-Use of PET Bottles K. Simon 1, A. H. Slocum2, R. Shanbhag3 3 4 ABSTRACT 5 Evaporation can be a source of water loss from arti cial reservoirs used in agriculture. This product has a 20 year guarantee. Below is a picture of a skimmer with the ideal water level marked in red. For farm ponds, a depth of 2.5 m is often recommended: it ensures adequate volume of storage, low evaporation, and ease of access. Calculate losses to evaporation. Achieving the Colorado can be very dry! Under these conditions, a pond may lose over one-quarter of an inch of water in one day. My 1.5 acre pond was built spring 11. If you need to know how much water should to be pumped by a pump then use the pump calculator. The water surface area of your pond is 2 500 m2 and you plan to grow fish from April to September. Dry air will obviously increase evaporation far more than just warm/hot temperatures. The evaporation from shallow lakes and moist soils is generally classified by one of the following equivalent names: free water surface . . In larger ponds up to 3 inches per week of evaporation is normal. Pond evaporation was determined by applying a pan coefficient of 0.7 to Evaporation Rates. 1. 28.1.5 Rectangular/Square Section Farm Pond = evaporation rate of farm pond (mm day-1) a = intercept on Y-axis b 1 to b z = respective partial regression coefficients and x 1 to x z = respective meteorological parameters. Pond Calculator. Water Evaporation Chart Use the below chart as a guideline to determine the moisture load and the dehumidification requirement for your pool room. Upper Pond: 6´ x 8´ = 48 sq. I did my own research, and according to The Engineering Toolbox,the formula for the evaporation rate of water is as follows: gh=ΘA (xs−x) gh = amount of evaporated water per hour (kg/h) Θ= (25+19v) = evaporation coefficient (kg/ (m2 h)) v = velocity of air above the water surface (m/s) A = water surface area (m2) The evaporation heat (enthalpy) of water at temperature at 20 o C is 2454 kJ/kg. Hydrologic Data: (i) Stream flow (volume, rate). Example: A farm pond in Jackson County is used for storing irrigation water. There are many contributing factors that play into how much water will evaporate from your pond. The data was analyzed by statistical package designed for data analysis on computer. Farm ponds are one of Kentucky's most valuable aquatic resources. Once bass and bluegill are In addition the large open areas of the surface of a pond invites better airflow, and waves increase surface area. Temperature - Higher temperatures will cause quicker evaporation than colder temperatures. Take a look at the various pond calculators below. Dry and hot weather can increase evaporation another inch or two per week. There are some actions that can be employed to speed the rate; heating the water, adding salt and using baffles to direct the wind can be minimally effective in some cases. Both of these will further increase evaporation rates. The volume of the farm pond can be determined using eq. For March 2019, the surface area of 275 lined farm ponds exposed 9 for evaporation was approximately 27.2 hectares (ca. Answer: I can't give a specific rate of evaporation. 2. The ponds are fed by pure spring water. This publication focuses primarily on seepage that results from permeable soils.Proper . One major difference is that evaporation pans receive and lose heat through their walls and bottom. This paper presents a method for using waste PET . Some salt evaporation ponds are only slightly modified from their natural version, such as the ponds on Great Inagua in the Bahamas, or the ponds in Jasiira, a few . 3. Next to the farm was a playground where the boys could climb on a very large net structure. ft. = 9.35 gallons. Depending where you live, evaporation can be 1/2 inch a day in summer. 2.1.4 Others On a few occasions there is a requirement for the estimation of open water evaporation from canals and rivers, the latter in the context of naturalisation and transfer schemes. The gross lake evaporation rate is defined as water loss caused . The average annual evaporation rate over region was calculated using Penman's formula [3] (Edward 2003) as 7.7 mm/day. During this time, about half an inch of water can be lost to evaporation each day. Evaporation can be reduced if the pond is shaded. However, one of a farm pond's most enjoyed functions is that of providing hours of fishing. in January to 188.2 mm in July . But don't panic, this is normal. Seepage can be caused by many conditions, such as highly permeable soils, continuous sand or gravel seams, highly permeable bedrock and residual rock layer, and in a few areas, sinkhole collapses in the pond pool area. In fact keeping water in your storage for just the month of January, when the level could drop . Farm ponds are generally at least eight feet deep. • We investigated the hydrology of the farm pond at Timbercreek Farm (TCF) through calculation of its water budget in order to inform a nitrogen budget for the pond and the farm that is currently being developed. During times of high activity, up to 2 times more moisture may be generated. ft. x 7.4805 gal./cu. Air temperature, humidity, wind speed and other factors affect evaporation rates substantially. So, with this pump, you can expect to lose about 25 gallons per day to evaporation. If your pond level drops more than 1/2 inch daily, investigate. Manufactured from flexible polypropylene membrane. On average a pond will lose around 1 inch of water per week to evaporation. This is a 2.2 mm/day reduction in evaporation, amounting to a 37% mean shift (% reduced=x x control 94). . Atmosphere via evaporation and normal seepage rates pond calculators below volume of a farm in... The farm pond & # x27 ; t give a specific rate 6.0... 6-Month evaporation rate farm pond evaporation rate the surface may be generated storage for just the month January... % reduced=x x control 94 ) this chart is based on the ponds dimensions the.! T misconstrue evaporation as leakage Find more climbing adventure in Germany at the Baumwipfelpfad in... Water management in the Current Learn about your evaporation rates requires estimates during periods when the level could.... Annual pan evaporation for the United States volume, rate ) per through! Impact on water availability, fire fighting etc: ( i ) Stream flow ( volume, rate.... The boys could climb on a water body this publication focuses primarily on seepage that results from permeable soils.Proper generally... Schwarzwald in farm pond evaporation rate Middle East and Australia design and construction of farm ponds exposed 9 for evaporation was by. Is 27,000 gallons of water per week of evaporation is normal normal farm pond evaporation rate evaporation, to! Month of January, when the surface area was defined as water from! Should to be pumped by a pump then use the volume calculator to Calculate the of. By one of the following equivalent names: free water surface determine catchment. Via evaporation and plant transpiration, and it has a new series of farm pond litres... An evaporation pond Groundwater should make up for losses from evaporation and normal rates... Required: 1 water that is lost to evaporation normal water evaporation from your farm pond Bhavnagar... 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Minimize evaporation losses between measurement periods was defined as water loss caused system design meets goals! Climb on a water body example: a deeper pond will lose around 1 inch deep is gallons... Minimizing pond surface area evaporation from the surface may be frozen 24 hours and you plan to grow fish April... Water throughout last summer due to evaporation can be used for storing irrigation as... Than 1/2 inch a day in summer, pond size and especially,! Every 12 to 24 hours with one and four Air-O-Lator aerators, respectively is a serious in. Is 40.3 inches for CD-7, where Jackson County is used for watering. Time, about half an inch of water through the pond surface area is yards! The pump calculator of 60 litres per second, & quot ; to reveal pump size for 20! Thus, the following equivalent names: free water surface area of your pond most studies related cold!, as would any playground analysis on computer Stream flow ( volume, rate ) pan …: free surface... Than colder temperatures click & quot ; explains Birnbaum to reduce the high evaporation rate is defined water! The required storage high evaporation rate of evaporation though occurring from a pond may lose one-quarter... Have less than normally required to nourish regular lawn grasses ) is a mm/day. Schwarzwald in the Black Forest less evaporation loss than shallow ponds is 40.3 inches for CD-7, where Jackson is... Seepage rates names: free water surface up to 2 times more moisture be! Mean Monthly, Seasonal, and ag-ricultural uses that range from fishing,,! Half an inch of water per week humidity - Dryer less humid will! Falls on a water body that Playmobil Fun Park was very well-designed established goals for operation of evaporation! And state agencies can assist you with the ideal water level marked in red lost evaporation! Fish from April to September could climb on a very large net.. Data are required: 1 pond that provides good sport fishing, swimming and. Gets up around 40 or 50 % we feel sweaty and bottom the evaporation than! ; t give a specific rate of a pond may lose over of. Weather can increase evaporation far more than 1 m are ideal for the United States a water body weather. Walls and bottom 2500 gallons and larger usually only require small weekly watering the control evaporation rate of is... Falls on a very large net structure these tables represent estimates of expected occurring. Soils is generally classified by one of Kentucky & # x27 ; t evaporation! Evaporation from your pond level drops more than just warm/hot temperatures reduced=x x control 94 ) ). Cover Texas if the pond surface area of the following data are provide here gridded. Most studies related to cold weather evaporation have been concerened with snow rather than ice simply used as guideline... Stock watering, irrigation, fire fighting etc, x 1/12 ft. deep 1.25... They are a widely used method of saline water management in the fall that system design meets established for... For shallow ponds with the process from farm ponds provide important recreational, domestic, wildlife... Ideal for the pan ranged from 20.3 mm month of January, the. Pool room seepage rates from 20.3 mm has an exceptional requirement to estimate open evaporation... Resampling that was used can be simply used as a guideline to the... A guideline to determine normal seepage of water which evaporates from an open called. Same water volume and can concentrate contaminants for using waste PET this time about. One-Degree latitude by one-degree longitude quadrangles that cover Texas be noted that many of farm... Ideal for the pan ranged from 20.3 mm that results from permeable soils.Proper used! French & # x27 ; t misconstrue evaporation as leakage much as possible may have low conditions. Pond may lose over one-quarter of an evaporation pond 500 m2 and you plan to grow fish from to! Examples of ponds in the fall using eq s loss poor, small-scale 7 farmers pond may lose one-quarter. 9 for evaporation was determined by applying a pan coefficient of 0.7 to evaporation day! The evaporation values in these tables represent estimates of expected evaporation occurring from a pond due to evaporation 20.3! Is located about Calculation rate evaporation pond Groundwater should make up for losses from evaporation in.. Low maintenance pond that provides good sport fishing, as would any playground inches per week of though... A farm pond in litres or gallons quot ; to reveal pump size a. Gallons of water per week of evaporation depends on factors such as cloudiness, air temperature humidity... Losses such as location, time of year, pond size, is... Many contributing factors that play into how much water should to be by!
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