<p>Yes, it is a typo.
This is from surface area = a * volume b
In the modelling tools’ terms, alpha = Anom / Snomb</p>

CC BY-SA 4.0
2022-08-23T11:46:50.510Z
2022-08-23T11:46:50.510Z
faith jumbi
<p>I am estimating the wetland water balance variables for the comprehensive wetland module.
For evaporation, it is calculated based on the net rainfall and average wetland storage area for the month. In the WRSM 2000 manual (Bailey and Pitman, 2015 page 136 of 186), alpha, a shape constant, is defined by relating the wetland volume to surface area as follows:
a = Anom / Snomb
Is this equation a typo?</p>

<hydrology><models>
WRSM-Pitman: Calculating alpha in the wetland surface area equation for estimating wetland evaporation
Peni_
# WRSM-Pitman: Calculating alpha in the wetland surface area equation for estimating wetland evaporation

(Asked by: username_0 on 2022-08-18)

I am estimating the wetland water balance variables for the comprehensive wetland module.
For evaporation, it is calculated based on the net rainfall and average wetland storage area for the month. In the WRSM 2000 manual (Bailey and Pitman, 2015 page 136 of 186), alpha, a shape constant, is defined by relating the wetland volume to surface area as follows:
a = Anom / Snomb
Is this equation a typo?

**Tags:** hydrology, models


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## 1 answers

### Answer by username_1 on 2022-08-23. Score: 0

Yes, it is a typo.
This is from surface area = a \* volume b
In the modelling tools’ terms, alpha = Anom / Snomb


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