3. lvrmch5 ukraine hydrology and drainage area
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HYDROLOGY HYDROLOGY METHODSMETHODS
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FLOW DETERMINATION METHODS
• United States Geological Survey (USGS) Regression Equations• Local Gauge Data• High Water/Bankfull Marks• Rational Method (for Small watersheds)• Other Methods -Corps of Engineers -HEC
-Natural Resources Conservation Service -WinTR-55 & WinTR-20
-Federal Highway Administration, AASHTO, State methods, etc.
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FLOW DETERMINATION
• Compare a Couple Methods • Consider Weather Variations and Period of Record•What About Changes in the Watershed?• Don’t Forget About
•Bulking•Sediment•Debris
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Guatemala
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Australia
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Gauging Data Method
Flow in your ungaged watershed (Qu) is determined from the following equation:
Qu = Qg (Au/Ag)*
Where Qg= Known discharge from the gauged watershed.
Au= Drainage Area of your ungauged watershed.
Ag= Known Drainage Area of the gauging station watershed.
Qu= Peak discharge from your ungauged watershed
*= an exponent, depending on recurrence intervaland region, usually ranging from 0.60 to 0.90.
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Manning EquationManning Equation
V = (1/n) (R2/3 )(S 1/2)
Where
V = Average flow velocity (m/s)
n = manning roughness coefficient S = Channel Slope (meter/meter) R = Hydraulic Radius (meters) = A/P A = Channel cross-sectional area, m2
P = Wetted Perimeter (meters)For English Units
V = (1.49/n) (R2/3 )(S 1/2)
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Формула Меннінга (в метричних одиницях)
V
1n
(R2/3)(S1/2) де V = середня швидкість течії
(метри/секунду)n = коефіцієнт шорсткості русла
(звичайно 0.04 - 0.07 для природніх русел);
див. табл. в посібнику, значення "n")S = ухил русла (метрів/ метрів)
R = гідравлічний радіус (метрів) = A/P
A та P є:A = площа поперечного розрізу русла P = периметр заболоченої ділянки
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Рівень повної води
Фактор шорсткості русла
Поперечний розріз русла А
Течія
Схема для визначення гідравлічних параметрів русла методом Менінга схил-площа
Периметр заболоченої ділянки
Макс ширина
Макс.глибина (рівень води)
Ухил
Середня глибина=
Площа ------------ширина русла
Гідравл радіус (R) = Площа (A)
------------------------------Периметр заболоченої ділянки (P)
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Rational Method (Developed to estimate flows for small watersheds (200-300 Acres)).
Q= C x i x A Where:
Q = Quantity of Flow (Runoff), in Cubic Feet per Second (cfs).
C = Runoff Coefficient.
i = Average Rainfall Intensity for selected frequency and duration equal to the Time of Concentration, in inches/hour.
A = Area of the watershed, in Acres.
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В метричних одинцях формула виглядає так:
Q= C x i x A362
де Течія визначається в куб.метрах на секунду; Площа – в гектарах; Інтенсивність дощу – в мм/год.
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In Metric Units, the equation is:
Q= C x i x A362
Where Flow is in cubic meters per second; Area is in Hectares; and Rainfall Intensity is in mm/hr.
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Source-Mike Furniss
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ExampleRational Method
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Drainage Area Drainage Area DeterminationDetermination
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DRAINAGE AREA DETERMINATION EXERCISE
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