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Runoff Generation and Routing in the TOPMODEL

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Presentation on theme: "Runoff Generation and Routing in the TOPMODEL"— Presentation transcript:

1 Runoff Generation and Routing in the TOPMODEL
Venkatesh Merwade

2 Recap R E Overland Flow Gravity Zone Saturated Zone P Root Zone
Soil Moisture Deficit

3 Key Points Zi (The distance between the land surface and the groundwater table) Topographic Index Drainage Area (Contributing area)

4 Topographic Index What is Topographic Index ? Index Curve
x = ln(a/tanb) a = A/(nL) Index Curve It defines the percentage of the total drainage area that contributes to the surface runoff.

5 Index Curve Area Ln(a/tanb)

6 Run off Generation Contributing Area Still No Runoff! Ground Surface
Zi Water Table Z To Outlet Channel Datum

7 Runoff Generation Cont’d

8 Routing The transfer component is divided into two phase
Overland flow within the contributing area which is routed at a velocity proportional to the local gradient with overland flow velocity constant. Flow to the outlet

9 Channel (Linear Routing)
Routing cont’d The saturation excess and the overland flow is routed through a routing model to get the resulting run-off. Saturation excess and Overland flow Channel (Linear Routing) Runoff


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