“ The Unit Hydrograph Model for Hydrograph Separation”

“The Unit Hydrograph Model for Hydrograph Separation” Ninghu Su Landcare Research, New Zealand Ltd. Environment International, 21, #5, 509-515

Article Summary • Introduction to Hydrographs • Nash Instantaneous Unit Hydrograph (IUH) Model • Parameter Equation Development • 3 Time Points for Parameter Estimation • Time of Concentration from Slope-Channel Relations • Recession Limb Used for Baseflow Calculation • Estimate Baseflow for Rising Limb (63%)

Key Hydrograph Features • Initial Loss – rainfall that does not affect hydrograph • Lag Time of Total Storm Hydrograph • Lag Time of Baseflow Hydrograph • Point A – Flow at Time = 0 hr • Point B – Time when Discharge Increases • Time of Duration for Effective Rainfall • Time of Concentration = Last of Overland Flow Flows • Point C – Time when Baseflow Begins • Point D – Time when Overland Flow Ceases

Hydrograph Calculations • Slope-Channel Empirical Equation for Time of Concentration • Time of Rainfall – Lag Time is Time of Effective Rainfall • To Draw in Points C & D • Rising & Recession Limbs are Determined

“ The Unit Hydrograph Model for Hydrograph Separation”

“ The Unit Hydrograph Model for Hydrograph Separation”

Presentation Transcript

Basic Hydrology

The Renzulli School Enrichment Model (SEM)

Table of Contents – pages iv-v

Spas with angularjs and sitecore

HLSC 4613 Principles of Epidemiology

INTRODUCTION

Table of Contents – pages iv-v

A Fox and a Kit

Table of Contents – pages iv-v

Table of Contents – pages iii

Unit 1 Friendship

Table of Contents – pages iii

Table of Contents – pages iii

Table of Contents – pages iv-v

Table of Contents – pages iii

TABLE OF CONTENTS

Table of Contents – pages iv-v

Unit 1 Friendship

Table of Contents – pages iii

Table of Contents – pages iii

Table of Contents – pages iii