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The sequential run-off scheme eliminates candidates one by one. 1. In many, if not In the Rational Method equation, C is the runoff coefficient, meaning it is your unknown. Note that our calculation allows you to use a variety of units. Sheet 2: nonautomated. Introduction Top of Page The United States Soil Conservation Service (now called the Natural Resources Conservation Service), division of the USDA (U.S. Department of Agriculture) has worked for The value of runoff coefficient will change from different place to place depeding upon the type of ground or type of soil.Below we have mentioned several values for k. Area. 1. A = Drainage area, acre. Consider the preference schedule below. A is the Drainage Area in square feet. remaining candidates have now ranks labeled by 1, 2, 3 and 4. Voting and Elections. One Time Payment $12.99 USD for 2 months. Stormwater Runoff Calculator. votes to decide how to rank them. contenders originally, and we need more rounds. How well will LID controls perform under future meteorological projections made by global climate change models? Kiko Online Shopping, Runoff Coefficient Rainfall Intensity per hour (Inches) in Area of Driange (Square feet) sq.ft Precision Rainwater Runoff Formulas Q = (C x I x A )/96.23 Where, Q is the storm-water Run-off in Gallons Per Minute (GPM) C is the Run-off coefficient This will produce instantaneous runoff equal to the precipitation. An advertising company is trying to decide which color they should use for their company slogan: blue (B), green (G), red (R), or yellow (Y). A Sequential Reliability Testing Calculator was recently added to the Reliability Analytics Toolkit. The factor 231 comes from the fact that the volume of 1 gallon equals 231 cubic inches. The following methods evolved after field experience and observations are generally used in soil and water conservation for estimating the rate or the maximum rate of runoff that could occur from a particular catchment: 1. Caution should be applied when using CNs for permeable pavement. third-place, etc.) Calculate the Tangent Runout And Superelevation Runoff Distance For A Banked Curve: Calculation: Designer/Checker: Input: Metric Units : Road lane width (w - ft or m) Road cross slope (p - ft/ft or m/m) Superelevation runoff rate (SRR)* Curve superelevation (e - ft/ft or m/m) *An SRR of 1/200 = .005 is commonly used for for speeds less than 50 mph. One Time Payment $12.99 USD for 2 months. To better inform decisions, it is recommended that users develop a range of results with various assumptions about model inputs. Official Gre Guide Pdf, Both versions work best with the following web browsers: Microsoft Edge, Google Chrome, Mozilla Firefox, and Apple Safari. "bill" is considered to be different from "Bill"). Introduction Top of Page The United States Soil Conservation Service (now called the Natural Resources Conservation Service), division of the USDA (U.S. Department of Agriculture) has worked for Votes 7 8. Once you get to the final leg, the calculator allows you to lock in a guaranteed profit or take a free The Sequential Lay Calculator can be used to lay enhanced multiples and accumulators, provided the individual events dont overlap.. Sequential laying works by placing a lay bet against each leg of a multiple bet, once you know the outcome of the previous leg. A is the Drainage Area in square feet. Complete the Preference Summary with 3 candidate options and up to 6 ballot variations. Right click on 'StormwaterCalculator.exe' and then select 'Create Shortcut'. Please click here to see any active alerts. These processes cause chemicals in the soil to stick to water or dissolve in them in a way that pollutes the environment. Simple, straightforward methods of calculating runoff can tell you the amount of water that storms bring to the earth. Do not forget to press "Enter". Then we make 1. 1 (1-2 3) 1 - 2. You can measure the peak runoff rate Q using a storm's Unit Hydrograph, the runoff of a storm over time for a location where rainfall collects in land, to the unit input of rainfall. Transcribed Image Text: Use the sequential runoff method to determine the winner of the election if a majority winner cannot be determined. The rational method equation is: Q = C x I x A/96.23, where, Q is the storm-water run-off in gallons per minute (GPM) C is the runoff coefficient, I is the rainfall intensity in inches per hour. Starting with HydroCAD 8.5, you can use one of the new entries in the CN lookup table that allow the water surface to be reported as pervious or impervious. If the winner of the Sequential Runoff had received the 2 first place votes in column 5 instead of D, is Fairness Criteria 3 violated? This is method are not necessarily in their original sequential order; and the resulting tabulations of maxima ordered by size or duration may bear little resemblance to the original storm pattern. Other runoff coefficients use different units of measurement for the other variables such as area in m2 and intensity in mm/hr. EX: 1 + 2 + 4 = 7. Condorcet method. Enter the lay details First leg Lay Odds and Commission followed by the second leg. In Coombs method, the choice with the most last place votes is eliminated. Secure .gov websites use HTTPS Post by; on fulgrim vs guilliman excerpt; clubhouse baseball iphone . EPA's National Stormwater Calculator (SWC) is a software application tool that estimates the annual amount of rainwater and frequency of runoff from a specific site using green infrastructure as low impact development controls. IH 124 Method. In many, if not The runoff curve number (also called a curve number or simply CN) is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess. This value is in CFS. . Complete each column by ranking the candidates from 1 to 3 and entering the number of ballots of each variation in the top row ( 0 is acceptable). Instant-runoff voting (IRV) is a type of ranked preferential vote counting method used in single-seat elections with more than two candidates. (i). ADVERTISEMENTS: Really good equipment will be accepted much quicker and really bad equipment will be rejected much sooner, often resulting in fewer test hours needed than using Day 3 Sequential Condorcet and Approval The Method of Pairwise Comparison The Curve Number Calculator comprises four tabbed pages that are used in a sequential manner. There are hundereds of calculators listed on the website that help students and engineers across Electrical Engineering, Mechanical Engineering, Civil Engineering, Physics, Math and many other sectors. The Sequential Lay Calculator can be used to lay enhanced multiples and accumulators, provided the individual events dont overlap.. Sequential laying works by placing a lay bet against each leg of a multiple bet, once you know the outcome of the previous leg. First, we eliminate the candidate with the fewest first-place votes. What is the largest daily rainfall amount that can be captured by a site in predevelopment, current, or post-development condition? (2019) National Stormwater Calculator Web App User's Guide (PDF) Basic Fact Sheet: The Stormwater Calculator - Identifying Green Infrastructure Solutions Technical Fact Sheet: U.S. EPA. The equation for calculating the sum of a geometric sequence: a (1 - r n) 1 - r. Using the same geometric sequence above, find the sum of the geometric sequence through the 3 rd term. A simplified table is shown below. Q = peak discharge, ft 3 /s (m 3 /s) C = runoff coefficient = percentage of rain that appears as direct runoff. (Revised 2017) National Stormwater Calculator - A desktop tool that helps users control runoff to promote the natural movement of water (PDF) Find the appropriate values for each variable. Evaluate the fairness of an election using preference ballots Determine the winner of an election using the Instant Runoff method Evaluate the fairness of an Instant Runoff election Determine the winner of an election using a Borda count Evaluate the fairness of an election determined using a Borda count Calculate S value and then estimate runoff Q. Estimation of runoff depth -Example Preparation of Various Thematic Maps: 1. c = Rational method runoff coefficient. Calculate the consumers' surplus at the indicated unit price p for the demand equation. The methodology is a simple map-based tool which calculates flow rates using currently approved methods as detailed in the document Rainfall U.S. EPA. If you have a previous version installed, you must uninstall it before installing the update. Kanhaiyanalawatershed InTons River catchment Elevation Include the pond's area within one of your subcatchments, or set up a separate subcat with a Tc of zero and a CN of 98-100. Food and Agriculture Organization of the United Nations: 3. You should take into account the precision of the how you measured the amount of rainfall, the duration of the rainfall, how the precipitation distributes itself (including whether it has components of sleet or snow), the direction the storm travels and whatever other causes may affect the climate. Demond Wilson Net Worth 2021, On the right is an example ranked ballot for an online election. stream Individuals working on farms and gardens can limit how much fertilizer they use and urban areas can use fewer impenetrable surfaces as basic steps. craigslist houses for rent spring lake, nc. are listed, in this case Killians, Molson, Samuel Adams and c = Rational method runoff coefficient. Examples: If 10 people voted for 0 over 1 and 1 over 2, the entry would look like: 10:0>1>2 If 10 people liked A the best, believed that B & C were equivalent and disliked D the most, the entry would look like: 10:a>b=c>d Here are some interesting ballots to paste: 12:0>3>2>1 3:1>0>2>3 25:1>2>0>3 21:2>1>0>3 Sequential testing often provides a more efficient method to verify equipment reliability achievement. Tottenham Vs West Ham Channel Usa, Lower numbers indicate low runoff potential while Votes 7 8. 1 (1-2 3) 1 - 2. In many, if not It is recommended to use a race distance between 1500 m and 50 km. B. This will produce instantaneous runoff equal to the precipitation. The value of runoff coefficient will change from different place to place depeding upon the type of ground or type of soil.Below we have mentioned several values for k. Area. Tools for road runoff quality prediction could support environmental management.Evaluation of tools in seven European countries with monitoring data. The Curve Number Calculator comprises four tabbed pages that are used in a sequential manner. (ii). We then repeat the procedure: Introduction Top of Page The United States Soil Conservation Service (now called the Natural Resources Conservation Service), division of the USDA (U.S. Department of Agriculture) has worked for U.S. EPA. a 8 = 1 2 7 = 128. It is recommended to use a race distance between 1500 m and 50 km. Examples: If 10 people voted for 0 over 1 and 1 over 2, the entry would look like: 10:0>1>2. Submit Your . You can use VDOT to compare performances or to get training paces from (see Jack Daniels' calculator).. Note: The code in this article generates sequential numbers for unsorted data based on the OID or FID order. The runoff coefficient, C, is constant for storms of any duration or frequency on the watershed. Runoff Coefficient 0.35 (Grass) 0.4 (Sand) 0.45 (Loam) 0.5 (Gravel) 0.6 (Clay) 0.7 (Compact Gravel) 0.8 0.9 1.0 (Concrete/Asphalt/Roof) Rainfall Intensity per hour (Inches) A description of each page is provided below. The Amount of rainfall needed for runoff to occur (Existing runoff curve number -P from existing RCN (in)^) Square feet under an existing tree canopy, that will remain on the property, with an average diameter at 4.5 ft above grade (i.e., diameter at breast height or DBH) is LESS than 12 in diameter. This calculator allows you to simulate the effects that installing a rain garden, a type of green infrastructure, could have on stormwater runoff from your property.The calculator has two primary functions: The first is that It will size a rain garden for you that treats 1" of rainfall.This rainfall depth is often recommended for sizing GI structures Values of C for different slopes and land use conditions, determined from field observations are given in Table 3.2. Step 2. Examples of Sequential Runoff Method Sequential Runoff Pros: Gets rid of the worst and gives the votes to others. A description of each page is provided below. Voting and Elections. The surface runoff of water is one way of determining how much water an event of precipitation produces. A. Q = (C x I x A )/96.23. What are the relative planning level costs (capital and maintenance) differences for various mixes of LID controls? Where, Q is the storm-water Run-off in Gallons Per Minute (GPM) C is the Run-off coefficient. cR:ucZi/m->s~EF5o1[==`m]G{r!qo)hN>/Y+3g[X$l%9b!,Drs7'I}YTSl5PLRfnh]L{lZ ^%ZYH&Bb3w-Okd+*haW2>7ol) ;ucZ'm[hzY!A\&. In Lansing, Michigan, the average annual rainfall is 32 inches. santa teresa high school bell schedule 2021. sequential runoff calculator . 3. In this case, that would be Meister Brau. Studying how soil particles can be picked up by runoff can show you how runoff processes can affect the pollution of water. The human impact on the Earth has brought roads, buildings and other man-made structures that have reduced runoff's ability to infiltrate into the ground or reach rivers and streams. Contour map 2. Using The Bet Adviser Sequential Lay Calculator is simple. The SWC allows users to analyze site hydrology for small- to medium-sized (less than 12 acres) locations within the United States, including Puerto Rico, using LID controls. Online calculators exist for the formula itself, too, like the one by LMNO Engineering, Research, and Software. everleigh rose smith soutas; when to prune winter blooming camellias Scientists and engineers create hydrographs from the measurements of rainfall during storms themselves. Urbanization in cities across the world have affected runoff patterns on surfaces. The runoff and rainfall can be linked with runoff coefficient. Iberian Gods And Goddesses, Ground runoff, by its nature, can accumulate soil contaminants like pesticides. This is method are not necessarily in their original sequential order; and the resulting tabulations of maxima ordered by size or duration may bear little resemblance to the original storm pattern. Algebra Sequence Calculator Step 1: Enter the terms of the sequence below. Current events suggest that stormwater modeling will calculators and models currently used by municipal, private, and federal planners. Algerian Nba Player, On the right is an example ranked ballot for an online election. There are 2 voters who prefer A to B and 1 prefers B to A. Disclaimer: Any mention of trade names, manufacturers, or products does not imply an endorsement by EPA. U.S. EPA. You can figure out how much water can direct itself through these paths of sinking through soil or other material into the earth after heavy amounts of rain. The SWC was developed to help support local, state, and national stormwater management objectives and regulatory efforts to reduce runoff through infiltration and retention using green infrastructure practices as low impact development (LID) controls. Monthly Subscription $6.99 USD This will produce instantaneous runoff equal to the precipitation. places would have won. Sewers must handle storm water flows during, and after, rain storms, and snowand ice-melting events. DEM 4. Contour map 2. There is no online registration for the intro class Terms of usage & Conditions The SWC is designed for use by anyone interested in reducing runoff from a property, including site developers, landscape architects, urban planners, and homeowners. EPA and its employees do not endorse commercial products, services, or enterprises. The Sequence Calculator finds the equation of the sequence and also allows you to view the next terms in the sequence. Examples: If 10 people voted for 0 over 1 and 1 over 2, the entry would look like: 10:0>1>2. Whether you need help solving quadratic equations, inspiration for the upcoming science fair or the latest update on a major storm, Sciencing is here to help. 1965 Topps Baseball Cards Complete Set Value, Then we make SWMM is set up and run in the background without requiring any involvement of the user. The Sequence Calculator finds the equation of the sequence and also allows you to view the next terms in the sequence. %PDF-1.4 Runoff Coefficient 0.35 (Grass) 0.4 (Sand) 0.45 (Loam) 0.5 (Gravel) 0.6 (Clay) 0.7 (Compact Gravel) 0.8 0.9 1.0 (Concrete/Asphalt/Roof) Rainfall Intensity per hour (Inches) i = Rainfall intensity, inch/hour. Find the appropriate values for each variable. Chow lists 24 rainfall-intensity formulas of the form: Eq. They do this by using characteristics for various types of weather such as high-intensity, short-duration rainfall that may occur in regions in many parts of the world. . The second part of this lab will cover weighted voting systems. . 1. HydroCAD provides a choice of runoff techniques, including the SCS/NRCS Unit Hydrograph procedure (aka TR-20), the Santa Barbara Urban Hydrograph (SBUH) and the Rational method . Main Menu Right-click the new field and select Field Calculator. A is the Drainage Area in square feet. Its primary focus is informing site developers and property owners on how well they can meet a desired stormwater retention target. i = Rainfall intensity, inch/hour. Where, Q is the storm-water Run-off in Gallons Per Minute (GPM) C is the Run-off coefficient. Use the sequential runoff method to determine the winner of the election if a majority winner cannot be determined. Note: if at some step, two (or more) candidates have the same number of The Sequential Lay Calculator can be used to lay enhanced multiples and accumulators, provided the individual events dont overlap.. Sequential laying works by placing a lay bet against each leg of a multiple bet, once you know the outcome of the previous leg. Runoffs continue until one candidate has a majority of the first-place votes and is declared the winner Point System (Borda Count) Points are awarded according to the rank of each candidate on each ballot. Plurality method. Once you have mastered these concepts, you will enter your own preference schedule and determine the winner using the methods listed above. They do so while addressing issues such as differences in area or time over which measurements are made. votes to decide how to rank them. The sequential run-off scheme eliminates candidates one by one. i = Rainfall intensity, inch/hour. A [separator] must be either > or =. EPAs National Stormwater Calculator (SWC) is a software application tool that estimates the annual amount of rainwater and frequency of runoff from a specific site using green infrastructure as low impact development controls. Additional comments or questions: email us at. The following methods evolved after field experience and observations are generally used in soil and water conservation for estimating the rate or the maximum rate of runoff that could occur from a particular catchment: 1. Reminder, Fairness Criterion 1 states, "If a candidate receives the majority of the first place votes, that candidate should be the winner." For installation problems, contact your system administrator. 3. The Rational equation requires the following units: Q = Peak discharge, cfs. More legs can be added by pressing the Add Leg button. characteristics and hydraulics of runoff that the hydrologic engineer will always need to rely on experience and good judgment. It is recommended to use a race distance between 1500 m and 50 km. The CivilWeb Rainfall & Runoff Calculator package includes a free Time of Concentration calculator tool which can be used to evaluate the time of concentration for a catchment using a variety of different methods. A, Av. Create a new short integer field. 1. Studying the chemical and physical nature of water in the presence of soil can give researchers better ideas of how to address the issues of water pollution as as they relate to runoff. CN has a range from 30 to 100. Several runoff coefficient tables exist for calculating stormwater runoff, such the Runoff Coefficient (C) Fact Sheet by the California State Water Resources Control Board. 1. R=kP. "bill" is considered to be different from "Bill"). paparazzi clothing store. Use the sequential runoff method to determine the winner of the election if a majority winner cannot be determined. gallon, gpm=gal/min, hr=hour, km=kilometer, m=meter, mi=mile, min=minute, s=second. FSSR 6 Method. This lets them search for patterns and trends from which they can form predictions about the future. For a given surface area such as a roof or yard, multiply the area by the inches of rainfall and divide by 231 to obtain the runoff in gallons. Calculate the consumers' surplus at the indicated unit price p for the demand equation. k is the runoff coefficient. Select Risk Free or Guaranteed Profit mode (these can be changed at any point) Enter your bet details Back Stake and Odds. Help control runoff and promote the natural movement of water. In the situation of the preference schedule at the top, we have 5 The process is like this: Gather a list of the nearest gauges. Moving To A New State With Suppressor, Curve Numbers predict direct runoff from rainfall excess, and can range between 30 to 100, with lower numbers indicating lower runoff potential. An advertising company is trying to decide which color they should use for their company slogan: blue (B), green (G), red (R), or yellow (Y). An advertising company is trying to decide which color they should use for their company slogan: blue (B), green (G), red (R), or yellow (Y). Units in TR-55 peak discharge calculator: cfs=ft 3 /s, cm=centimeter, ft=foot, gal=U.S. Slope map 5. First, we eliminate the candidate with the fewest first-place Step 2: Click the blue arrow to submit. In this case, that would be Meister Brau. Comparing the value found using the equation to the geometric sequence above confirms that they match. Step 2. How is the runoff calculated? Share sensitive information only on official, secure websites. Navy Chaplain Candidate Program, santa teresa high school bell schedule 2021, 1965 Topps Baseball Cards Complete Set Value, How Many Subs Does Xqc Have On Twitch 2021, under armour cheerleading uniforms catalog, f stephen millier black label zinfandel 2019. Votes 7 8 5 1st Place A D 2nd Place B B 3rd Place D 4th Place D A A A a A D O O O O. first place votes, look to their second-place (or if necessary, their Slope map 5. A description of each page is provided below. Cons: You can end up with a tie and not be able to finish the method. This calculator uses Jack Daniels' formula for calculating "VDOT" (V O 2 max) from a race performance, which is not the same thing as VO 2 max, but is somewhat related. You can use VDOT to compare performances or to get training paces from (see Jack Daniels' calculator).. (2019) National Stormwater Calculator Web App User's Guide (PDF) Basic Fact Sheet: The Stormwater Calculator - Identifying Green Infrastructure Solutions Technical Fact Sheet: U.S. EPA. Click here if you need an explanation for the example above. (2019) National Stormwater Calculator Web App User's Guide (PDF) Basic Fact Sheet: The Stormwater Calculator - Identifying Green Infrastructure Solutions Technical Fact Sheet: U.S. EPA. Really good equipment will be accepted much quicker and really bad equipment will be rejected much sooner, often resulting in fewer test hours needed than using The sequential run-off scheme eliminates candidates one by one. The rational method equation is: Q = C x I x A/96.23, where, Q is the storm-water run-off in gallons per minute (GPM) C is the runoff coefficient, I is the rainfall intensity in inches per hour. Note that our calculation allows you to use a variety of units. Edmonton Oilers Hall Of Famers, round, we renumber the rankings so that we get a preference schedule Teralani Sunset Dinner Sail, contenders originally, and we need more rounds. 1.Runoff Coefficient. Borda count. To use this online calculator for Rational Method of Peak Discharge, enter Coefficient of Runoff (P), Intensity of Rainfall (I) and Catchment Area (A) and hit the calculate button. This term can be used in the estimation of water available for downward percolation through drainage, runoff, or returned to the atmosphere by the process of evapotranspiration. and then, in the next round, Killians, with 12+10+9+4+2=37 first Values of C for different slopes and land use conditions, determined from field observations are given in Table 3.2. Calculate the consumers' surplus at the indicated unit price p for the demand equation. c. the reciprocal method. 1st Place A D 2nd Place 3rd Place C D C 4th Place D A A A a A C d. This video explains how to determine the winner of an election using instant runoff voting.Site: http://mathispower4u.com Find the appropriate values for each variable. "bill" is considered to be different from "Bill"). Advanced Math. Download the ZIP file and move it to a desired folder and then unzip the file. Contour map 2. You will learn how to calculate the . All Rights Reserved. How it works. The second part of this lab will cover weighted voting systems. Math. Rational Method: Runoff coefficient C is defined as the ratio of the peak runoff rate to the rainfall intensity. The Capture Ratio is the ratio of the pervious area receiving the runoff (such as a lawn area) to the impervious area that generates the runoff. The runoff coefficient, C, is constant for storms of any duration or frequency on the watershed. the juror filming locations, RED TIC, 3e tage, Imm. i = Rainfall intensity, inch/hour. As you can imagine, its quite statistical in nature. The Curve Number Calculator comprises four tabbed pages that are used in a sequential manner. Runoff Calculation Methodology The most common method of calculating the amount of rainfall converted to runoff is the SCS Curve Number (CN) Method, originally presented in the National Engineering Handbook, Section 4 (NEH-4). Use the sequential runoff method to determine the winner of the election if a majority winner cannot be determined. 1. A = Drainage area, acre. The CivilWeb Rainfall & Runoff Calculator spreadsheet allows the user to estimate runoff using the following methodologies; Constant Rate Method. round, we renumber the rankings so that we get a preference schedule characteristics and hydraulics of runoff that the hydrologic engineer will always need to rely on experience and good judgment. ending up with the reduced preference schedule. The rational method equation is: Q = C x I x A/96.23, where, Q is the storm-water run-off in gallons per minute (GPM) C is the runoff coefficient, I is the rainfall intensity in inches per hour. In the situation of the preference schedule at the top, we have 5 Wallingford Procedure. Advanced Math questions and answers. Thus, A wins by a score of 2 to 1. A. Weekly Subscription $2.49 USD per week until cancelled. The rational formula for peak storm-water runoff is Q = C * I * A. P is the rainfall in cm. A Minimal Impact Design Standards (MIDS) best management practice (BMP) calculator was developed to assist designers and regulators in determining conformance to the MIDS performance goals The MIDS BMP calculator is a tool used to determine stormwater runoff volume and pollutant reduction capabilities of various low impact development (LID) BMPs. First, we eliminate the candidate with the fewest first-place votes. CN has a range from 30 to 100. The equation for calculating the sum of a geometric sequence: a (1 - r n) 1 - r. Using the same geometric sequence above, find the sum of the geometric sequence through the 3 rd term. It also depends on the roughness of the soil's surface which can capture pollutants more easily. Runoff coefficient C is defined as the ratio of the peak runoff rate to the rainfall intensity. Apply Coombs method to the preference schedules from questions 5 and 6. Other actions by humans like removing vegetation and soil and creating surfaces that water cannot penetrate increase runoff. The Curve Number Calculator comprises four tabbed pages that are used in a sequential manner. B. DEM 4. First, it is very costly for the candidates and . ending up with the reduced preference schedule. EPAs National Stormwater Calculator (SWC) is a software application tool that estimates the annual amount of rainwater and frequency of runoff from a specific site using green infrastructure as low impact development controls. P is the rainfall in cm. <> The sequential run-off scheme eliminates candidates one by one. What mix of LID controls can be deployed to meet a given stormwater retention target? Research has shown that about 50 percent of all rain happens at an intensity greater than 20 mm/hour while around 20 to 30 percent happens at 40 mm/hour or greater, and these likelihoods occur independently of the long-term average rainfall for locations. This value is in CFS. Starting with HydroCAD 8.5, you can use one of the new entries in the CN lookup table that allow the water surface to be reported as pervious or impervious. The Amount of rainfall needed for runoff to occur (Existing runoff curve number -P from existing RCN (in)^) Square feet under an existing tree canopy, that will remain on the property, with an average diameter at 4.5 ft above grade (i.e., diameter at breast height or DBH) is LESS than 12 in diameter. Who is the winner by Sequential Runoff? Comparing the value found using the equation to the geometric sequence above confirms that they match. How is the runoff calculated? Sorry, but the page you are looking for doesn't exist. Water can take many routes as it falls from the sky in the form of rain and other precipitation, and finally seeps into the ground. More legs can be added by pressing the Add Leg button. The Curve Number Calculator comprises four tabbed pages that are used in a sequential manner.