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# Hydrology calculations excel

Rational Method Hydrologic Calculations with Excel . Harlan H. Bengtson, PhD, P.E. COURSE CONTENT 1. Introduction . Calculation of peak storm water runoff rate from a drainage area is often done with the Rational Method equation (Q = CiA). Calculations with the Rational Method equation often involve determination of the design rainfall

Kerby Time Of Concentration Calculator Watershed Hydrology Equations Formulas. Solving for time of concentration. Inputs: flow length (L) retardance roughness coefficient (n) unitless. slope (s) unitless. Conversions: flow length (L) = 0 = 0. foot . retardance roughness coefficient (n) = 0 = 0. slope (s) = 0 = 0. Solution: time of concentration ...Using the data developed in the hydrologic analysis, an inflow hydrograph was produced for the 6 hr - 100 yr storm using the SCS Curve Number Method. The inflow hydrograph produced using the SCS Curve Number Method for the 6 hr - 100 yr storm was used as an input for a flood routing program developed in Excel.For the calculation of A and B from the characteristics of the system, a calculator is built in. In this example the discharge of a subsurface drainage system is calculated for regular inputs of irrigation water using a reaction factor alpha=0.1 (A=0, B=0.1).hydrologic abstractions. It relates the estimated peak discharge to a theoretical maximum of 100% runoff. Typical values for C are given in Table 3-1. If the basin contains varying amounts of different land cover or other abstractions, a composite coefficient can be calculated through areal weighing as follows:(6) Weighted C = Σ (C x A x)/A ...

Hydrologic Calculations with Excel. Example calculations and examples using an Excel spreadsheet for. The return periods for this path, then projected to derive from a notable presence of the watershed and scs peak discharge method uses and column allow some of a road. For non-delineated streams it list the 100-year peak discharge based on ...Open the Excel file containing the rainfall data. Because the SCS CN method is based on computing excess rainfall from total rainfall, the given rainfall hyetograph is first converted into a cumulative rainfall hyetograph or rainfall mass curve so it will represent the total amount of rainfall after each time step since the beginning of the storm.