lecture_07 - 7.3 CONSTRUCTION OF UNIT HYDROGRAPH VOLUME OF...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
LECTURE 7 - SURFACE RUNOFF CHARACTERISTICS AND FORECASTS 7.1 STREAMFLOW FROM FORESTED AND URBAN WATERSHED 7.2 STORM HYDROGRAPH RELATIONSHIPS 7.3 REQUIREMENTS FOR FORECASTING DEPTH OR VOLUME OF RUNOFF TIME TO PEAK PEAK RUNOFF RATE BASE TIME 7.3 THE UNIT HYDROGRAPH A TRANSFER FUNCTION FOR SYSTEMS MODELING OF HYDROLOGIC RESPONSE WITHIN A BASIN ASSUMPTIONS UNIFORM DISTRIBUTION OF RAINFALL EXCESS OVER THE WATERSHED UNIFORM RAINFALL EXCESS RATE, WHERE EXCESS RATE = RAINFALL RATE - INFILT. RATE RATE OF RUNOFF IS PROPORTIONAL TO THE RUNOFF VOLUME FOR RAINFALL EXCESS OF A GIVEN VOLUME. ASSUMES THAT WATERSHED RESPONSE IS LINEAR
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 7.3 CONSTRUCTION OF UNIT HYDROGRAPH VOLUME OF SURFACE RUNOFF CURVE NUMBER PROCEDURE (SCS 1972) t p t L % D 2 q p 484 A t p B 2.67 t p DIRECT RUNOFF PRECIPITATION HYDROLOGIC SOIL GROUPS (A-D) ANTECEDENT SOIL MOISTURE CONDITIONS TIME TO PEAK t p Where t = TIME LAG F(HYDRAULIC LENGHT, L SCS CURVE NUMBER, AVERAGE LAND SLOPE) D = TIME INCREMENT OF RAINFALL EXCESS PEAK RUNOFF RATE q p Where A = WATERSHED AREA t = TIME TO PEAK p BASE TIME B Where = TIME TO PEAK 7.4 DEVELOPMENT OF A STORM HYDROGRAPH BASED ON KNOWLEDGE OF THE RAINFALL DISTRIBUTION...
View Full Document

Page1 / 2

lecture_07 - 7.3 CONSTRUCTION OF UNIT HYDROGRAPH VOLUME OF...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online