how to calculate wind speed at different heights

Wind speed height calculator - site-stats.org Wind shear can be expressed as. Found inside – Page 79This physical model requires different specific data for the simulation of a wind farm, which are listed in Table 4-2: Table ... If the wind speed is not at hub height, this tool provides the possibility to calculate the wind speed at ... Design Wind Speed Calculator | Calculate Design Wind Speed ... T, i.e., the maximum wind speed which is exceeded, on average, once every T years, the return period. Cold air is to the left of the thermal wind. Bernoulli's equation can be used to explain why curveballs curve. %PDF-1.4 %�� Found inside – Page 53potential flow solvers calculate the frequency- dependent wave force coefficients, which define the forces per unit wave amplitude or ... The wind speed is also typically defined at a particular height above the ground or sea surface. Both are based on the relationship between pressure gradient (e.g. Minimum the following parameters for the wind speed: Average, Maximum and Standard deviation of the wind speed. Most U.S. manufacturers rate their turbines by the amount of power they can safely produce at a particular wind speed, usually chosen between 24 mph or 10.5 m/s and 36 mph or 16 m/s. The error terms containing the factor kU/u*=ln((z-D)/z0)~ 4-8 can be particularly large. The sensitivity of these formulas to errors in height, wind speed, and friction velocity measurements are, where dz, dU, and du* are measurement errors in height, wind speed, and friction velocity. Engineering Noise Control - Page 248 No, it is not. This seems bad news at first but look at the higher end of the wind speed: 10m/s, 12m/s, ... these are the sort of wind speeds that usually wind turbines work best, and have their higher efficiency!! Found inside – Page 68... and how to extrapolate the data you collect to calculate probable wind speed at different heights above different types of terrain. You can download this handy document at: www.energy.iastate.edu/renewable/wind/wem-index.htm. We find the numbers of hours the wind has been blowing at different wind speeds for both sets of data (Real data and Weibull). Wind Speed Factor allows you to compare the actual cooling capability between ceiling fans that are of different sizes and CFMs. Wind analysts and Banks know all this too well, there’s no secret, just maths and good wind data. In general for small wind turbines that are going to be privately funded, things start to look a bit interesting over 4m/s. Found inside – Page 187Thus these results cannot be used directly to calculate wind energy capacity of these study points. Similarly, wind speed has been found to change at different heights from the ground at the same study point. Hence, further studies may ... PDF Air pressure and wind WINDLogger SC323404, Registered Office: PO Box 26237, Kilmarnock, KA1 9GE, Scotland, UK, Introduction to Wind speed monitoring for wind turbines, Cold wind monitoring at Rondane National Park, Norway, Wind Monitoring for Universities and Research: The Importance of High Specification Equipment, Average: This is the mean average of wind speed during the 10 minutes period, usually given in meters per second [m/s], Maximum: This is the maximum or gust wind speed measured during the 10 minutes intervals, Standard deviation: This is an indication of the wind turbulence intensity during the 10 minutes interval. Variation of wind speed with height - Sustainable Energy Analysis of Wind Data, Calculation of Energy Yield ... I will show my formulas and would like to see if anybody has a better idea. To estimate the air speed and output for the actual height of your tower you can use an empirical 1/7 power law. Step 3 - Wind speed (u 2) The average daily wind speed in meters per second (m s-1) measured at 2 m above the ground level is required. Wind site assessment 0000007089 00000 n 0000053862 00000 n Sometimes a good average wind speed from a database can have not so good real wind data due to surroundings (trees, houses, valleys) and other times a not so good annual average wind speed from a database may result in a very good site given the individual characteristics of that micro site (ie: high elevation over the landscape). In the past, the ެg�>{\�]��nf�2� �:U��Yy>lu��-g�R~:Q��H1�b}�I��Y�W��S5�C+oM�/�ܷԚ޲�X�V_��ю��׹��g�+,�6��@ٞ�{��,5_#뼩u�`�u��oQ�B�1r~o�{��F�dnGVsQ�R��Kk�́�Z�텵��z�i�2u��\o;SI�b��?vVnLl�isaI��&O�"�d��i�h��--R�ՙ��`!3�I\ GWCRew�8D�(4ɑmm�!��ӷ Found inside – Page 490Anemometers used for measuring wind speed are mounted at different heights. Such localization allows to determine wind velocity gradient as a function of height. Thanks to that, the authors are able to estimate, so-called, ... With known values of mean wind speed at gradient height and exponent α, wind speeds at height Z are calculated by using Eq. Instructions: Enter the blade span and CFMs of any ceiling fan to calculate it's Wind Speed Factor. trailer Wind (kts) is the wind speed in knots, Wind (mph) is the wind speed in miles per hour, Wind (km/h) is the wind speed in kilometers per hour, Wind (m/s) is the wind speed in meters per second. Wind forces will often be in a different direction to weight forces, and the resultant catenary and calculated forces will be different, particularly where unequal heights are specified. The chart is a ready reference, but when outdoors remember that wind can present many dangers. Found inside – Page 45At some stations, so few observations of wind speed were recorded that the observer was literally noting whether it was ... Calculating the Wind Shear Exponent (α) If you're measuring wind speeds at different heights, or if you've found ... In here we sill more elaborate the wind details such as following. How To Find The Wind Speed: The only exact way to know wind speed is to use a meter. We predicted wind speed vertical extrapolation by using extended power law. Follow these instructions to determine what size flagpole you will need Flagpole Height (Exposed heights are 13', 17', or 21'). Note that if the zero-plane displacement height is known, then the roughness length can be calculated from measurements of wind speed and friction velocity by a singe sonic anemometer. This tool shows maps of average monthly wind speed and direction for the contiguous United States from 1979 to the present. slow the air as it collides into them. We may be in a windy area but the particular spot we may be looking at could be surrounded by obstacles like trees, houses or even towns a few miles away. As a ballpark figure, doubling the height typically increases wind-speed by 10% and thus increases the power of the wind by 30%. with a prop-vane at 10m height and a sonic anemometer at a second height. 0000001168 00000 n However, it is the direction and height at which the wind is blowing that assume significance when calculating the wind load on a structure. If you know the air speed V1 at a certain height h1, then the air speed V2 at a different height h2 can be estimated as: V2=V1×(h2/h1) 1/7. A wind turbine produces electrical power by harnessing wind within the atmospheric boundary layer. As known, by using the Hellmann coefficient, estimated wind speed values at a requested . where U is the mean wind speed measured at height z (above ground level), u* is friction velocity, and k=0.4 is the von Karman constant. 0000053615 00000 n This allows to produce more long term energy forecasting. inertial_advective_wind (u, v, u_geostrophic, …) Calculate the inertial advective wind. Notice that the wind speed, V, has an exponent of 3 applied to it. There's got to be a formula, but I was not able to find it… Thank you! Ground-level obstacles such as vegetation, buildings, and topographic features tend to slow the . To determine the effective stack height wind speed, U H, use the following equation and table. ��`�QPP�h��рl6�2��i ��h1�� `ʐ�`#��f��A��! Can you please help me to calculate how many rotations per minute has a wind turbine, taking into consideration that I only have the following info: - diameter - height - blade length - wind speed - wind class - cut-in speed - cut-out speed. You may recall from high school mathematics that you can calculate the slope of a linear graph using two points along the line. Figure 1. Wind Speed Calculator. Found inside – Page 247The standardization of the mean wind speed in this study follows the three steps: (1) determine the exposure type of the observation station; (2) calculate the ... wind speeds are equal at the gradient height over different exposures. where V (z) is speed of wind at required height Z, Vr is . Some standard formulae for speed v as a function of height z are: 1. Calculate the average wind speed, this will give you a generic idea of how much wind speed the site has. Use this component to calculate wind speed at a specific height for a given terrain type. endstream endobj 37 0 obj <> endobj 38 0 obj <> endobj 39 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>>/Type/Page>> endobj 40 0 obj <> endobj 41 0 obj <> endobj 42 0 obj <> endobj 43 0 obj <> endobj 44 0 obj <> endobj 45 0 obj <> endobj 46 0 obj <>stream The wind rose can be thought of as a wheel with spokes, spaced, in this example, at 30 degrees. 1. Hub heights of modern 600 to 1,500 kW wind turbines are usually 40 to 80 metres, however. First Part is 2.7 meter height with 140mm diameter, Second part of Pole is 2.7 meter height with 146 mm diameter and… Power supply of the wind logger or monitor device. Calculate frequency distribution, this will give you a much clearer view of the wind profile of the site by distributing or dividing the different wind speeds into sections. Excerpts from the spreadsheet, Tables Found inside – Page 90Fortunately, average wind speed data from state wind maps can be adjusted using a relatively simple equation: V ... It is used to make adjustments in wind speed at different heights based on the texture or roughness of the ground ... The surface wind speed is different at the effective stack height, which is used in the Gaussian model. 0000003339 00000 n Typically, for most users of wind data, estimates of the 50-year return period gust or wind speed are required, based on 10-20 (and often fewer) available years of observations. 0 It can be noted that the errors in roughness length dzo are proportional to zo, whereas the errors in zero-plane displacement dD are proportional to (z1-D) and (z2-D). Found inside – Page 453The variation in the average horizontal wind speed Uz with height z from ground level (z = 0) is a logarithmic function and is described in general terms by ... 17), we can then calculate Uz for different heights z within the canopy. Found insideIn order to estimate wind energy resources, we must measure the daily and annual wind speed and wind direction and ... China's meteorological departments measure the wind speeds at various heights and calculate the average value of n to ... Wind speed can be measured with an accuracy of 0.5-2 ms −1 and a vertical resolution of about 5 m along the path across the entire troposphere from about a 12-km height down to 4-10 m above the sea surface (for safety reasons, they can only be operated over the sea), and the measured wind speed range is up to 150 ms −1. 13' - Small, single story homes, structures, decks, docks or traveling. 10 u10 = klnz-o Then or where u. z -ln-u k Z0 lnZ-lnZ0 u 10 = u. startxref Ideally let a wind analyst to look at it, definitely if the wind speed seems reasonable and the site promising. Maps show the average (mean) wind speed as well as two components of wind direction: U-wind . U.S. Wind Climatology - Monthly. Wind slow down along the surface is " wind shear". For example, our scatterometer wind products are referenced to a height of 10m. Found inside – Page 101Something worth highlighting is that z0, for a homogeneous land, can be obtained by means of measurements at two different heights. Once this new z0 is to hand, it becomes very straightforward to calculate the speed at other heights and ... Hub heights of modern 600 to 1,500 kW wind turbines are usually 40 to 80 metres, however; The spreadsheet will calculate average wind speeds at different heights and roughness classes To calculate the wind resource you will need to measure several variables: Wind speed. In this case, increments of five feet were cho-sen. Then, the spreadsheet is used to calculate the allowable wind velocity at the specified load of 19,600 ft-lb. Found inside – Page 404In order to know the average wind speed in the city Yekaterinburg in 2016, it was used data which include information about ... Average annual wind speed in Yekaterinburg. ... Average wind speed at different heights in Yekaterinburg. The surfaces of the PV arrays are between 5 and 10 feet. Calculate the energy output of a wind turbine during 3 h of continuous operation, with a blade length of 10 m and efficiency of 40 %, when the wind speed is 15 kph and the air pressure and temperature are 1013.25 hPa and 15°C. Found inside – Page 737This is defined as the height above ground in meters at which the wind speed is theoretically equal to zero. ... Another way to calculate the Hellman exponent (a) is to perform measurements at the same time at two heights, ... You will need several months to take an informed decision. Found inside – Page 117In the turbulent boundary layer above a crop, measurements of wind speed at different heights produce a result ... 0.56 2.00 2.54 0.69 The equation to be used is u = #In z – £n zo] and we therefore calculate the values of £n (height). 2.1.3.1 Adjustment for Wind Exposure and Mean Roof Height Tabulated wind requirements in this chapter are based on wind exposure category B and a mean roof height of 33 feet. This change will result in either a counter-clockwise or clockwise curvature. When thinking of installing a small wind turbine at your home or farm, there are a few things to consider, but probably the most important can be summarised in three key points: This is simple, the taller the wind turbine tower the better. Found insideThe WRF model has been used to calculate the wind speed at different heights (10, 40, 60, 80, 100, and 160 m) for the period January 10, 2014 until September 12, 2014. The output frequency is every 10 min. At most sites, the wind speed is measured by an anemometer fixed to a tower at a standard height of 30 feet above the ground. Wind speed is simply the speed at which the wind is blowing. 0000002735 00000 n 36 27 Found inside – Page 39Turning now to the height of the masts, it is known that the wind speed generally increases with height, as illustrated in Figure ... If a hub height measurement is not made, then it will be necessary to estimate the shear profile. For Vertical Axis Wind Turbine (Darrieus Rotor) the area can get as The surface wind speed is different at the effective stack height, which is used in the Gaussian model. Why do I need a wind logger or to record wind speeds at all? A=(π/4) D 2. Within the tool, click the Overview link in the upper right for information about the maps. Under the Variation with Height tab on the Wind Resource page, you can describe the way the wind speed increases with height above ground. We need to make sure the “wind turbine is going to work with the wind and not against it”. But... 1,500kWh per month is not a lot is it? When no height value is provided, it is normally assumed that the measurement was taken at 10 metres. HOMER Pro 3.14. The relationship between wind speed at 10 m and wind speed at any height from 0 m to 10m can be derived as follows. Above shows the comparison with two anemometer on the same wind mast, one at 40 meters and the other at 30 meters. From Equation 1, for wind speed u at height Z: u. z u =-In k z 0 For wind speed at the reference height, 10m: u. An initial estimate of wind generated significant wave heights can be made by using Figure 7-A-1. You may also be interested in our Wind Chill Calculator x�b```b``�� Ā B@1V� �'0��Ϛ��/P�E��L��L�GP��CF=�+m�}�n�Lҥ�d��q@%J. An example is given in Figure I.2.6. The aerodynamic surface roughness length, zo, and zero-plane displacement, D, are defined for a neutral wind profile by. Age . v = the wind speed at height h (m/s) vo = the wind speed at height ho (m/s) α = the wind shear exponent. 0000002062 00000 n Wind turbines are not much different, the bigger the rotor the more wind they will capture. The table provides data only for 10 m and 50 m heights. Advisable to measure temperature and/or pressure, humidity. geostrophic_wind (height[, dx, dy, latitude, …]) Calculate the geostrophic wind given from the height or geopotential. Comments will be approved before showing up. Roughness of the area. Failing anything else… contact us and we will put you in contact with some specialist. For those that are interested, a discussion of each follows. Found inside – Page 119Based on the measurements, semi-empirical models were created to calculate the wind speed at different heights in street canyons, considering the direction and speed of the undisturbed wind and the geometry and orientation of the canyon ... Just enter a wind speed measured at a certain height for a given roughness class and click the Submit button. Fortunately, it is much easier to use a table where . CURVATURE- A change in wind direction over some horizontal distance. Both average wind speed of 3.5 m/s. For this situation, the data are generally ﬁtted to a theoretical 0000001325 00000 n LLLJP Wind Shear Formula (Power law) The wind speed at a certain height above ground level is: u=(u ref)*((z/z ref) α). 0000084136 00000 n Found inside – Page 290Numerical simulation is adopted to calculate the wind pressure on the surface, analyzing the horizontal wind speed distribution and wind pressure distribution at different heights under the influence of different prevailing wind ... I use a weighted average method to calculate average wind direction. This calculator calculates the design wind speed at any height using probability factor, height factor, topography factor, cyclonic region factor values.. Design Wind speed is the wind speed at any height taken for the design of high raise (>10m) buildings, for the wind load calculation. HOMER uses this information to calculate the wind speed at the hub height of the wind turbine. Wind is the velocity at which the air moves. These could have an unwanted effect not just on the increase of wind turbulences but also on the wind speed itself which could be severely reduced. The higher, the fewer obstacles and therefore the less turbulence on the wind and usually means higher wind speeds. 10 = lnlO-lnZ 0 = -In-k z0 b = 1 lnlO-lnZ0 Terrain. Found inside – Page 1332Another issue planned to be addressed in this study is the differences of the turbulent wind characteristics existing in ... (3) adjust wind speed at the observation height to the reference height (10-m); and (4) calculate the mean ... With the predicted data we found that we have a 12% probability of wind at 6m/s but with the real data, it shows only 6.5%. The thermal wind is parallel to the isotherms. Final point to make here which ties with Locations is that in certain areas where wind is too gusty or turbulent, or even too fast, in these places it may not be the best solution to install a wind turbine with a big rotor and other smaller wind turbines will be able to take full advantage of those high wind speeds. Solving for the two wind profile parameters. The thermal wind is a difference of winds at two different heights. 0000080152 00000 n The 40m anemometer is showing an average wind speed of 1m/s more than the 30m one. 0000002989 00000 n Found inside – Page 121For a known roughness length at a site the application of equation (4.2) to two different heights gives the following very useful equation 01 02 ln ln zz zz Having measured a wind speed v1 in the height z1 (measuring mast) this equation ... Found inside – Page 98... error between calculated and meaplete time series. Therefore, a significant increase in ru sured wind speed. ... 7.6, the ratio between calculated and measured wind speeds for the different heights. As before, the wind speeds are ... I will start with small wind turbines and very basics points and little by little increase the technicality and complexity of wind site assessment which is often the bread and butter of Wind Energy Analysts. 0000006827 00000 n Hub heights of modern 600 to 1,500 kW wind turbines are usually 40 to 80 metres, however. Tubular Street Light Pole (430V) height is 11 Meter which is in made with three different size of Tubular Pipe. Found inside – Page 83... AN ANALYSIS PROGRAM Comparison of hourly wind speeds (two anemometers at same height or at different heights) Frequency distributions (calculate wind power/area; see Figure 4.16) Frequency distribution graph Diurnal wind speed graph ... Taller windmills see higher wind speeds. Wind energy gains more attention day by day as one of the clean renewable energy resources. Variation of wind speed with height. Figure 1.4 shows an annual wind speed histogram calculated from the Rayleigh distribution formula compared to a measured annual histogram at Bushland, Texas. Wind Speed Conversion Formulas: Conversion formula for Miles per hour to Knots: Wind (kn) = 0.8689762 x Wind (mph) Wind (mph) = 1.1507794 x Wind (kn) Conversion formula for miles per hour to meters per second: Wind (m/s) = 0.44704 x Wind (mph) Wind (mph) = 2.23694 x Wind (m/s) Conversion formula for miles per hour to kilometers per hour: The Annual Variability of Wind Speed A 'wind rose' is the term given to the way in which the joint wind speed and direction distribution is defined. 0000003237 00000 n Sample wind speeds at different heights Wind speed increases with height above ground 21 Profile depends on surface properties (roughness (Example of average, maximum and standard deviation wind speed on LeSENSE, provided by Logic Energy Ltd), (Frequency distribution chart using LeSENSE, provided by Logic Energy Ltd). Additional 56" swedged sections can be purchased in The chart below shows on the horizontal axis the wind speed in meters per second and on the vertical axis the wind probability per wind speed. With the total number of hours at different wind speeds, we put them together with the typical power curve supplied by any wind turbine manufacturer, and we find very different values: Data collected (Real data): 1,492kWh in one month, Data estimated using Weibull: 1,086kWh in one month. ��J��Q5��. 0000038016 00000 n If the estimated wave height from the nomograph is greater than 0.6 m (2 ft) it is recommended that the Army Corps of Engineers procedures be used to refine the input parameters. appendix C. P. 56 code Z = height of the hill (feather) = 150m Usually a wind mast will have several sensors at different heights in order to get a better of the wind at the site. Found inside – Page 495In order to calculate the mixing height, data concerning atmospheric stability and surface properties are needed. ... Depending on the model used, wind speed may refer to different heights above the ground surface. The wind speed used ... Ideally it would account for the change in the drag coefficient at different altitudes. Well, all depends of the size of the wind turbine and the wind available at the site. Found inside – Page 175U is the wind speed at 2 m above the ground surface expressed in meters per second . ... for wind speed measurements taken at different heights above the ground surface ( Doorenbos and Pruitt , 1977 ) 0.5 1 1.5 2 3 4 5 6 8 10 Measuring ... Found insideWind direction shear,the difference between wind directions at different heights, can also enhance lateral plume dispersion. ... (6.21)and(6.22) toinclude plumeriseenhanced dispersion: Calculate the wind speed at a 90m height. Wind turbulence. For each 0000084348 00000 n Z 2 = Height 2 (upper height) α = wind shear exponent ; Wind shear is quantified as the exponent α (alpha) in the power law equation that relates wind speeds at two different heights. The spreadsheet will calculate average wind speeds at different heights and roughness classes. Ideally no less than 6 months and better to have full year. As a ballpark figure, doubling the height typically increases wind-speed by 10% and thus increases the power of the wind by 30%. You could also allow people to enter other factors like wind . The pressure on the right-hand side is atmospheric pressure, and if we measure heights from the level of the chamber, the height on the left side is zero, and on the right side is 60 m. This gives: Why curveballs curve. D and z o are best calculated with a wind profile measured at several levels, but (theoretically) they can also be calculated from two levels of wind data as commonly measured by the ISFF Flux-PAM stations, i . The result is a thermal wind that is created by a change in the geostrophic wind with height that is caused by a horizontal temperature variation. Rating System: (1 . The curves of Fig. According to the wind shear formula from NREL , the speed varies as a power of the height: 10 m where v10 is the speed at 10 m, and a typical value . The wind speed can be different in different directions, resulting in varying wind loads. Found inside – Page 74Release at the same height as they were on the flower. ... The seeds should also be released at different heights and from amongst grass of various heights. ... Repeatin different speeds of winds, measuring these speeds if possible. Definitely it is well worth to knowing the real potential of your site before investing in a wind turbine. Individual micro sitting of wind turbines are affected by the site’s landscape complexity. Small deviations on measured wind speeds as small as 0.4m/s could convert in several £10,000s over the 20-25 years of the feed in tariff. This study was done with a very small wind turbine. In this study, an extended vertical wind velocity extrapolation formulation is derived on the basis of perturbation theory by considering power law and Weibull wind speed probability distribution function. From that equation, we'll find t, which is the time of flight to . Influence of exposure terrain on variation of wind velocity with height. The calculator assumes acceleration due to gravity is 9.8m/s^2. Found inside – Page 117The two configurations consist of the “paired” data set in which two anemometers are positioned at the same height, and the “shear” data set which includes an array of anemometers at different heights. Various wind speed statistics, ... Planning your wind speed monitoring project. Where: U a = wind speed at altitude Z a, m/s. For this reason, these measured wind speeds are being extrapolated to turbine tower heights by using the formula known as 1/7 wind power law . due to wind stress and subtracted due to bottom friction and percolation. With these three rules in mind, we can look for the “perfect” site to install a wind turbine but before that, you will need to monitor your site’s wind speed for a period of time, the longer the better. When wind speed is measured, it is important to specify the height at which the anemometer is installed. Found inside – Page 1A table of design wind pressures at various heights from less than 30 to more than 1,200 feet above ground is ... to the use of different sources of data or a different method of determining wind pressures from recorded wind speeds . Type of anemometers Found inside – Page 227These data about wind speed and wind direction over time at a given height (10m agl if no height is specified) are ... To make it possible to use data from one site to calculate the energy in the wind at another site in the same region, ... <<758EECB7E8C9A540A6E424A4E8904B3B>]>> 2 shows that for a height of 100 m the difference between the speed values using both equations (3) and , is for about 0.35 m/s, which would represent a difference of approximately 100 W/m 2, since the energy content of the wind varies with the cube of the average wind speed, which is why one must be very careful when making . 0000049673 00000 n wind turbine. ~%��=��X�&%?7�Y�Oޔ"]G��e�Y%ni!J�a�N2�Y喏�l�S|p�KU�� v��']��İ��H��Z��i2� d7�)��b+U#��r��Ɋ{�{W^�od��[��]}�Q��Co��3�� V��]�:��@�=]ރ��PnI�&y~��K2��*�lՖ�>��+�@�� Additional loads Send it to your preferred wind turbine supplier, they will be able to tell you how much energy you should expect from your site. So far so good, but how does this relate to energy production? (height, distance, duration) Calculator', please fill in questionnaire. Launch from the ground (initial height = 0) To find the formula for the range of the projectile, let's start from the equation of motion. The wind speed in skydiving is calculated for pilots.-Wind speed calculation for the drones-It's a device that's used to determine which way the wind is blowing.-A wind gauge is a device that measures wind pressure and flow.-Weather stations in different parts of the world. The Kestrel 1000 wind speed meter is a great tool. tower height and wind velocity, as shown in Table 1.6 The tower heights are first inserted into the table for the full range of heights possible. Found inside – Page 321It is important to verify the height at which wind speed is measured , as wind speeds measured at different heights above the soil surface differ . The calculation procedure to adjust wind speed to the standard height of 2 m is ... %%EOF Your wind analyst or consultant will be able to advice you on this when you have collected enough wind data measurements. Is this enough to make a decision? 17' - Mid-size homes, 2 story structures 21' - Large homes or areas.
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