H_210_NEH_630 - Part 630 - Hydrology
Part 630 - Hydrology

Chapter 1 - Introduction

(09/1997)

630.0100  Introduction

630.0101  Duties and responsibilities of NRCS hydrologists

630.0102  Other technical guides

Chapter 2 - Watershed Project Evaluation Procedures    

          630.0200  Introduction

          630.0201  Work outline plan and schedule relationship

          630.0202  Hydrologic evaluation process

          630.0203  Design hydrology

                         Figures



Chapter 3 - Preliminary Investigations
     

(11/2010)

630.0300  Introduction

630.0301  Making the preliminary investigation

600.0302  Summary

630.0303  Report

Figures

Example

Chapter 4 - Storm Rainfall Depth and Distribution

(08/2019)

630.0400  Introduction

630.0401  Sources of data

630.0402  Rainfall Over a Watershed

630.0403  Temporal Distribution of Rainfall

630.0404  Uses of Precipitation Depth and Distribution

630.0405  Comparing Precipitation-Frequency Data and Distribution

630.0406 Smoothing Precipitation Values from NOAA Atlas 14 Data

630.0407 Development of 24-Hour Rainfall Distribution From 5-Minute Through 24-Hour Rainfall Values

630.0408 Example of Determining a Design Rainfall Distribution for a Region Based on GIS Data

630.0409 References

Tables

Chapter 5 - Streamflow Data

(11/2015)

630.0500  Introduction

630.0501  Streamflow data types and sources

630.0502  Streamflow data collection

630.0503  Uses of streamflow data

630.0504  Considerations for use of streamflow data

630.0505  References

Tables

Figures

Chapter 6 - Stream Reaches and Hydrologic Units

(11/2015)

630.0600  Introduction

630.0601  Reaches

630.0602  Project Benefits Estimation on Alluvial Fans

630.0603  Hydrologic units

630.0604  References

Tables

Figures

Chapter 7 – Hydrologic Soil Groups

630.0700  Introduction

630.0701  Hydrologic Soil Groups

630.0702  Disturbed Soils

630.0703  References

Tables

Chapter 8 - Land Use and Treatment Classes

(06/2002)

630.0800  General

630.0801  Classification of land use and treatment

630.0802  Classes

630.0803  Determinations of classes

630.0804  References

Tables

Chapter 9 – Hydrologic Soil-Cover Complexes

630.0900  General

630.0901  Determinations of complexes and curve numbers

630.0902  References

Tables

Figures

Examples

Chapter 10 - Estimation of Direct Runoff from Storm Rainfall

630.1000  Introduction

630.1001  Rainfall-runoff relationship

630.1002  Applications

630.1003  Accuracy

630.1004  References

                 Appendix

                 Tables

                 Figures

                 Examples

Chapter 11 – Snowmelt

630.1100  Introduction

630.1101  Snowmelt theory

630.1102  Data sources

630.1103  Modeling snowmelt

630.1104  Snowmelt runoff

630.1105  Runoff hydrographs from snowmelt

630.1106  References

                 Table

                 Figures

                 Examples

Chapter 12 – Hydrologic Effect of Land Use and Treatment 

630.1200  General

630.1201  Volume effects

630.1202  Lag effects

630.1203  Determination of effects

630.1204  References

                 Tables

                 Figures

Chapter 13 – Stage Inundation Relations 

630.1300  Introduction

630.1301  Stage versus area inundated methods

630.1302  Flood peak or volume versus area inundated method

630.1303  Frequency versus area inundated method

630.1304  Computer determination of area inundated

630.1305  Combination method of determining area inundated

630.1306  Stereoscopic and other methods

630.1307  References

                 Tables

                 Figures

Chapter 14 - Stage Discharge Relations 

          630.1400  Introduction

          630.1401  Development of stage discharge curves

          630.1402  Collection of field data

          630.1403  Discharge versus drainage area

          630.1404  Computing profiles

          630.1405  Road crossings

          630.1406  References

                         Tables

                         Figures

                         Exhibits

Chapter 15 - Time of Concentration

          630.1500  Introduction

630.1501  Definitions and basic relations

630.1502  Methods for estimating time of concentration

630.1503  Other considerations

630.1504  Examples

630.1505  References

               Appendices

Chapter 16 - Hydrographs

630.1600  Introduction

630.1601  Development of hydrograph relations

630.1602  Unit hydrograph

630.1603  Application of unit hydrograph

630.1604  Unit hydrograph development for a gaged watershed

630.1605  References

                Appendix 16A  Elements of a Unit Hydrograph

                Appendix 16B  Dimensionless Unit Hydrographs with Peak Rate Factors from 100 to 600

                Tables

                Figures

                Examples

Chapter 17 - Flood Routing

Introduction

Elevation-storage and Elevation-discharge relationships

Reservoir Routing Methods

Channel Routing Methods

Unit-hydrograph Routing Methods

Figures

Tables

Chapter 18 - Selected Statistical Methods

          630.1800  Introduction

630.1801  Basic data requirements

630.1802  Frequency analysis

630.1803  Flow duration

630.1804  Correlation and regression

630.1805  Analysis based on regionalization

630.1806  Risk

630.1807  Metric conversion factors

630.1808  References

Tables

Figures

Examples

Exhibits

Chapter 19 - Transmission Losses

630.1900  Introduction

630.1901  Assumption and limitations

630.1902  Symbols and notation

630.1903  Applications

630.1904  Examples

630.1905  Summary

630.1906  References

                Appendices

                Tables

                Figures

Chapter 20, Watershed Yield

630.2000  Introduction

630.2001  Water balance

630.2002  Methods of computer water yield

630.2003  Reservoir storage planning

630.2004  Data Sources

630.2005  References

                Tables

                Figures

Chapter 21 - Design Hydrographs

630.2100 Introduction

630.2101 Determining runoff volumes for design of earth dams and associated spillways

630.2102 Principal spillway hydrographs

630.2103 Auxiliary spillway and freeboard hydrographs

630.2104 References

Appendices

Chapter 22 - Glossary  

(2/2012)

          630.2200  Introduction

          630.2201  Definitions

          630.2202  Abbreviations and symbols

          630.2203  Conversion factors

[H_210_NEH_630 - Amend. 88, Aug 2019 - ]