Default surface flow values

Unless you modify the default values, all zones (and elements) in the surface flow domain will be assigned the default properties listed in Table 5.18:

Table 5.18: Default Properties for Surface Flow

Parameter	Value	Unit
Name	Surface flow defaults	-
X friction factor	0.0548	-
Y friction factor	0.0548	-
Rill storage height ${\displaystyle h_{ds}}$	0.0	m
Obstruction storage height ${\displaystyle h_{o}}$	0.0	m
Node coupling scheme	shared	-
Coupling length	1 × 10−4	m

For each instruction we will again indicate its scope (i.e. .grok, .oprops). Recall that if an instruction is used in the prefix.grok file, it will affect the current set of chosen zones, while in a properties (e.g. .oprops) file, it will only affect the named material of which it is a part.

X friction

Scope: .grok .oprops

1. val x friction factor, ${\displaystyle n_{x}}$ in Equation 2.35.

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Y friction

Scope: .grok .oprops

1. val y friction factor, ${\displaystyle n_{y}}$ in Equation 2.36.

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Rill storage height

Scope: .grok .oprops

1. val Rill storage height [L], ${\displaystyle H_{d}}$ in Section 2.2.2.2.

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Obstruction storage height

Scope: .grok .oprops

1. val Obstruction storage height [L], ${\displaystyle H_{o}}$ in Section 2.2.2.2.

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Coupling length

Scope: .grok .oprops

1. val Coupling length [L], ${\displaystyle l_{exch}}$ in Equation 2.71.

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