Basic Hydrology & Hydraulics: DES 601

Module 1Introduction

Instructor and Participant Background

• Introductions• Instructor• Participants

• Sign-in sheet process

• VTC letter

Module 1

Training Logistics• Restroom locations

• Breaks• Each module is about an hour can take short

breaks between lessons (5 min)• Lunch break is 1 hour

• Assessment• Need to pass the assessment at end of the

training (examination)

Module 1

Course Objectives

• Derive watershed parameters.

• Derive flow rates using hydrologic methods.

• Able to apply hydraulic concepts and perform a simple hydraulic analysis.

Module 1

Acronyms

• HDM: TxDOT Hydraulic Design Manual 2011 Ed.

• HDS2: FHWA-NHI-02-001 Highway Hydrology

Module 1

Context

Module 1

Stream Stability at Highway Bridges

NHI3 days

Stream Scour Instability Countermeasures

DES 807NHI

2 ½ days

Basic Hydrology and HydraulicsDES 601TxDOT3 days

Culvert Design and BridgesDES 604TxDOT3 days

Urban Storm Drain DesignDES 602TxDOT

2 ½ days

Geopack DrainageDES 738TxDOT3days

HEC-RASDES 802

NHI3 ½ days

Managing Floodplain Development through the NFIP48MGFL

FEMA4 ½ days

Certified Floodplain Manager Exam½ day

Practical Highway Hydrology

NHI3 days

Basic Watershed Modeling using HEC-HMSDES 606

3 days

Floodplain Encroachment

Basic: All engineers and designers

Advanced: DHEs and Hydraulics Branch

Intermediate:Engineers

Course Structure

• Hydrology• Module 1 through 12

• Hydraulics• Module 13 through 22

• Assessment• Module 23 is preparation, Module 24 is

the assessment.

Module 1

Hydrology

• Hydrology is the study of the occurrence, distribution, and movement of water above, on, and below the surface of the earth.

• Hydrology is used to estimate discharges at a location

Module 1

Hydraulics

• Hydraulics is the study of the physics of water motion.

• Hydraulics is used to estimate flow depths in hydraulic structures such as channels and culverts.

• Hydraulics is also used to estimate resulting forces at a location.

Module 1

Watershed

• The fundamental unit in surface water hydrology is the watershed.

• A watershed is defined as the area on the surface of the earth that drains to a specific location.

Module 1

The Watershed• Watershed physical properties include:

• Area

• Main channel length (if a main channel exists)

• Slope (requires the specification of path),

• Soil moisture/permeability

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Watershed Delineating• Topographic maps

• Hands-on methods• Marking directly on

map• Tracing using light

table• Computerized methods

• DEMs• GIS software• Semi-automated

delineation• Fully automated

delineation• Automated

measurements should always be verified

Module 1

The Watershed

• Watershed physical and descriptive characteristics determined after delineation.

•Areas and lengths

•Slopes

•Cover

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Minimal Watershed Description

• Watershed boundary on a map

• Area that drains to the outlet

• Main channel length

• Slope(s)

• Other Descriptive

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Example/Exercise: Delineate a Watershed

• Use the 11X17 Map of Harden Branch Creek in Concho County Texas

Module 1

Example/Exercise: Delineate a Watershed

• Use the 11X17 Map of Harden Branch Creek in Concho County Texas

Module 1

Summary

• Course logistics

• Introduced hydrology and hydraulics

• Introduced the “watershed” as the fundamental unit of hydrology

Module 1