ICM InfoWorks - 🌧️ Runoff Volume Models

 

🌧️ Runoff Volume Models

🌐 Runoff volume models in InfoWorks help determine the amount of rainfall 🌦️ that transitions into the drainage system 🚿, considering initial losses 💧.

🔧 Set the Runoff Volume Model within the Runoff Volume Type field of the Runoff Surface. This surface then links to one or more Land Use objects 🌱 which connect to one or more subcatchments.

🤝 Surfaces of varying types might be combined in one model. Remember to set the correct initial conditions in the Rainfall Event for each surface type used.

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📘 Runoff Model Overview

📌 #	📖 Model	🚦 Type	💡 Comments	📊 Runoff Surface Data Fields Used	👥 Appropriate For
1️⃣	Constant Infiltration (ConstInf)	Individual	Set constant infiltration from surface to groundwater.	Fixed Runoff Coefficient, Infiltration Loss Coefficient	General usage
2️⃣	DefConLoss	Individual	Based on HEC-HMS model.	Maximum Deficit, Infiltration Loss Coefficient	Advanced hydrological modeling
3️⃣	f1-Rsa	Individual	Calculates effective rainfall using Quasi Linear Reservoir Method.	Minimum runoff, Maximum runoff, Saturated rainfall	Standard in Japan 🇯🇵
4️⃣	Fixed percentage runoff	Individual	You define the percentage of rainfall that becomes runoff.	Fixed Runoff Coefficient	When runoff percentage is known
5️⃣	Green-Ampt	Individual	Used only on pervious surfaces.	Green Ampt Conductivity, Green Ampt Suction, etc.	US with SWMM model 🇺🇸
6️⃣	Horner	Individual	Determines net rainfall on urban subcatchments.	Horner Alpha, Horner Beta, Horner Recovery	Urban areas 🏙️
7️⃣	Horton	Individual	Used only on pervious surfaces.	Decay factor, Initial infiltration, etc.	Rural and pervious surfaces 🌳
8️⃣	HortonSWMM	Individual	Specialized for pervious surfaces.	Decay factor, Initial infiltration, etc.	Desbordes or SWMM models
9️⃣	New UK (Variable) PR	Total catchment	UK model for changing catchment conditions.	New UK Depth, API30	UK pervious catchments 🇬🇧
🔟	PDM	Total catchment	Requires PDM option enabled.	-	Specialized usage
1️⃣1️⃣	ReFH	Individual	Based on procedures by CEH.	ReFH Cini (rainfall event initial condition), ReFH BF0	Most UK subcatchments 🇬🇧
1️⃣2️⃣	SRM	Total catchment	Requires PDM option enabled.	-	Specialized usage
1️⃣3️⃣	UKWIR	Total catchment	Uses UKWIR equation by HR Wallingford.	Effective impermeability, IF, etc.	UK catchments 🇬🇧
1️⃣4️⃣	USA Soil Conservation Service (SCS) method	Individual	A rural catchment model.	SCS Depth, SCS Index (rainfall event initial condition)	Rural catchments 🌾
1️⃣5️⃣	Wallingford Procedure (Fixed) PR	Total catchment	Default model for the UK.	Fixed Runoff Coefficient, Wal. Proc Distribution	UK urban catchments 🇬🇧
1️⃣6️⃣	CN	Individual	Rural catchment model similar to SCS.	Curve number, SCS Index (rainfall event initial condition)	Rural catchments 🌾
1️⃣7️⃣	DWA (Grenzwertmethode)	Individual	German initial loss and runoff model.	Decay factor, Initial infiltration, etc.	Catchments in Germany 🇩🇪
1️⃣8️⃣	CNSWMM	Individual	Developed by US EPA.	Curve number, SCS Index (rainfall event initial condition)	Rural and pervious surfaces 🌳