[Qgis-user] How do I add a dam to a project then calculate its volume

[Sébastien LAGARDE]

Hello.
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[img]<https://track.cipac.nc/l/ZkN2UlZzdXRTbFFKQzNla1AzWTYwZz09-eFZMaExNZWZGQjMvaVVJaDArTTl6Zz09>

Sébastien LAGARDE



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De : QGIS-User <qgis-user-bounces at lists.osgeo.org> De la part de GPS Admin via QGIS-User
Envoyé : jeudi 18 septembre 2025 09:05
À : qgis-user at lists.osgeo.org
Objet : [Qgis-user] How do I add a dam to a project then calculate its volume

Greetings!

This is my first question for this list and I am new to qgis, so be gentle!

We are building a 20 acre (8 hectare) lake and need to design an earthen dam and calculate the amount of fill dirt needed to build the dam.

We are starting with lidar data of the entire watershed and have created contours, then mapped the shoreline of the lake. I would like to add a dam to the model and then calculate the volume of the fill needed to construct the dam.

1) What is the best general workflow for this project?

2) How can I add the dam as 3D feature? The dam is not straight, it is arched.

3) What is the best way to calculate the fill required?

Thanks!

- Ron

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