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Originally published in the National Engineering Handbook, Part 4 - Hydrology. This information is distributed as a courtesy by HydroCAD Software Solutions LLC. NATIONAL ENGINEERINGHANDBOOK SECTION 4 HYDROLOGY CHAPTER 16. HYDROGRAPHS. Hydrogmphs, or some elements of them such as peak rates, are used in the planning SCS Curvilinear method uses the dimensionless unit hydrograph developed by Please refer to National Engineering Handbook Section 4 for the equationsA relationship was developed between watershed unit hydrograph peak rate factors the unit hydrograph peak flow National Engineering Handbook (NEH–4), National Engineering Handbook Hydrology Chapters ; Chapter 05, Streamflow Data, Mar 2020 ; Chapter 06, Stream Reaches and Hydrologic Units, Nov 2015. National Engineering Handbook. Procedures (chapter 15) are computed for use in hydrograph graph step by modifying the unit hydrograph to reflect. National Engineering Handbook. Hydrographs. Chapter 16. Figure 16A–1 Dimensionless curvilinear unit hydrograph and equiva- 16A–1 lent triangular hydrograph.