手法を比較

	Unit Hydrograph	MODFLOW groundwater modeling	Muskingum法
分野	土木工学	土木工学	土木工学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1932	1984 (original release); continuously updated through MODFLOW-6 (2017)	1938
提唱者	L. K. Sherman	Michael G. McDonald and Arlen W. Harbaugh (U.S. Geological Survey)	George McCarthy
種類	Linear transformation from rainfall to streamflow	Numerical groundwater flow simulation	Hydrologic method for flood attenuation in rivers
原典	Sherman, L. K. (1932). Streamflow from rainfall by the unit graph method. Engineering News-Record, 108(14), 501-505.	Harbaugh, A. W. (2005). MODFLOW-2005, the U.S. Geological Survey modular ground-water model — the Ground-Water Flow Process. U.S. Geological Survey Techniques and Methods 6-A16.	McCarthy, G. T. (1938). The Unit Hydrograph and Flood Routing. US Army Corps of Engineers Document 608.
別名	UH, Rainfall-runoff, Hydrograph synthesis	MODFLOW-2005, MODFLOW-6, modular groundwater flow model, USGS groundwater model	Flood routing, Stream flow attenuation, Hydrologic routing
関連	3	0	3
概要	The unit hydrograph (UH) is a linear transformation that converts rainfall excess into streamflow for a watershed. Introduced by Sherman in 1932, the UH assumes that rainfall-runoff response is linear and time-invariant, enabling synthesis of flood hydrographs from design storms for dam spillway design and flood risk assessment.	MODFLOW is the U.S. Geological Survey's open-source, modular finite-difference model for simulating three-dimensional groundwater flow through porous media. First released in 1984 and continuously updated — most recently as MODFLOW-6 — it is the global standard for quantitative hydrogeological analysis, widely used in civil engineering, environmental consulting, water-resource management, and groundwater contamination studies.	The Muskingum method is a hydrologic flood routing technique that predicts how a flood wave attenuates (reduces in peak) and spreads as it travels down a river reach. Developed by McCarthy in 1938 for the US Army Corps of Engineers, the method is simple enough for hand calculations while capturing the essential physics of flood propagation.