Initial abstraction ia
WebbWhat is the abbreviation for Initial abstraction? Initial abstraction is abbreviated as Ia Related abbreviations The list of abbreviations related to Ia - Initial abstraction COD … WebbInitial Abstraction is a parameter that accounts for all losses prior to runoff and consists mainly of interception, infiltration, evaporation, and surface depression …
Initial abstraction ia
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WebbAbstract: The Initial Abstraction ratio (Ia/S, or λ) in the Curve Number (CN) method was assumed in its original development to have a value of 0.20. Using event rainfall-runoff … The runoff curve number is based on the area's hydrologic soil group, land use, treatment and hydrologic condition. References, such as from USDA indicate the runoff curve numbers for characteristic land cover descriptions and a hydrologic soil group. The runoff equation is: where
http://ruby.fgcu.edu/courses/twimberley/EnviroPol/CurveNumber.pdf WebbThe initial abstraction consists of interception, surface detention, evaporation, and infiltration. The water held by interception, surface detention, and the infiltration at …
Webb10 juni 2024 · P=Ia + Fc + Q (1) Proportional equality hypothesis (2) Ia - S hypothesis: I a=λS (3) Where, P is the total rainfall (mm), I a is the initial abstraction, F c is the cumulative infiltration excluding I a, Q is the direct runoff (mm), S is the potential maximum retention (mm) or infiltration and λ is the regional parameter WebbInitial abstraction (Ia) is a sensitive parameter in hydrological models, and its value directly determines the amount of runoff. Ia, which is influenced by many factors related …
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WebbThe initial abstraction is computed from the precipitation and CN number and inserted in this field. For more information, see Ia/P, and Chapter 2 of TR-55, Urban Hydrology for Small Watersheds (U.S. Soil Conservation Service 1986b). edelman auction serviceWebbAs can be seen in the curve number equation, runoff cannot begin until the initial abstraction has been met. It is important to note that the curve number methodology is an event-based calculation, and should not be used for a single annual rainfall value, as this will incorrectly miss the effects of antecedent moisture and the necessity of an initial … condviewWebb31 juli 2011 · The initialabstraction (ia) is: ia = iaMax - iaUsed based on the maximum amount of ia, the ia used (iaUsed), the recovery rate (iaRecov) and the month and class of RDII. You can enter a value for iaMax, iaInit and iaRecov for each month. The iaUsed at the beginning of the simulation is set equal to iaInit and if there is no rainfall edelman barometer of trust 2022 citeWebbHEALPix-IA Algorithm. We call the algorithm HEALPix-IA because it is an initial alignment method based on HEALPix. To minimize the cost function in Equation ( 4 ), several steps need to be followed in order. In this section, HEALPix is introduced to reduce the dimensions by mapping the local features to 2-sphere first. edelman about usWebbThe initial abstraction ratio (Ia/S); (initial abstraction Ia-potential maximum retention S) plays an important role in the calculated runoff depth, the hydrograph peak and … edelman beth pumpWebbin Watershed 2, Treynor, Iowa Figure 10–4 Comparison of 10 and 90 percent extremes with 10–8 ARC I and ARC III values from table 10–1 Figure 10–5 Comparisons of computed with actual runoff on a 10–20 frequency basis ... which no initial abstraction occurs; i.e., I a = 0. edelman authorWebb1 apr. 2009 · The ratio of initial abstraction (Ia) to maximum potential retention (S) was assumed in its original development to be equal to 0.2 in SCS-CN method. The constant initial abstraction ratio is... ed ellis washington redskins