# Urban Flood Risk Mitigation model - flood depth **URL:** \ **Category:** Science, Research & Data\ **Tags:** urban-flood\ **Created:** [October 27, 2021, 4:18pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247 "2021-10-27T16:18:06Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![FabricioRichmond](https://avatars.discourse-cdn.com/v4/letter/f/ed655f/32.png) [@FabricioRichmond](https://community.naturalcapitalalliance.org/u/FabricioRichmond)\ **Post date:** [October 27, 2021, 4:18pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/1 "2021-10-27T16:18:06Z")
Hi everybody, I am starting to use the model. Do you know hydraulic model is used? It is the Quickflow used in Seasonal Water Yield? or this Urban Flood Risk not consider flood depth for water acumulation? ---
**Author:** ![jdouglass](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/jdouglass/32/9_2.png) [@jdouglass](https://community.naturalcapitalalliance.org/u/jdouglass)\ **Post date:** [October 27, 2021, 4:42pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/2 "2021-10-27T16:42:40Z")
Hi @FabricioRichmond , the Urban Flood Risk Mitigation model doesn’t actually use a hydraulic model. Rather, the model will calculate the runoff volume and the runoff retention … but not what happens to the water when it leaves the pixel. As mentioned in the user’s guide: > The InVEST model calculates the runoff reduction, i.e. the amount of runoff retained per pixel compared to the storm volume. Hope this helps! James ---
**Author:** ![FabricioRichmond](https://avatars.discourse-cdn.com/v4/letter/f/ed655f/32.png) [@FabricioRichmond](https://community.naturalcapitalalliance.org/u/FabricioRichmond)\ **Post date:** [October 27, 2021, 6:58pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/3 "2021-10-27T18:58:45Z")
@jdouglass, thank you. I usually used a hydraulic model to calculate the deep water and then relate this information with possible economic losses. Só, how are the economic losses calculated without deep water (flood magnitude)? ---
**Author:** ![jdouglass](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/jdouglass/32/9_2.png) [@jdouglass](https://community.naturalcapitalalliance.org/u/jdouglass)\ **Post date:** [October 27, 2021, 7:55pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/4 "2021-10-27T19:55:33Z")
Rather than consider flood height, the model merely calculates the total area of building footprints that intersect the watershed/sewershed in question. The damage value for each type of building is then set in the damage loss table (which is a model input). It’s a calculation of potential damage due to flooding. The details are in [this section of the model’s user’s guide chapter](https://storage.googleapis.com/releases.naturalcapitalproject.org/invest-userguide/latest/urban_flood_mitigation.html#calculate-potential-service-optional). ---
**Author:** ![FabricioRichmond](https://avatars.discourse-cdn.com/v4/letter/f/ed655f/32.png) [@FabricioRichmond](https://community.naturalcapitalalliance.org/u/FabricioRichmond)\ **Post date:** [October 28, 2021, 1:50pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/5 "2021-10-28T13:50:29Z")
So, I could use Caddie 2D to calculate flood height in order to get building footprints that intersect these flood areas. It ok? Thank @jdouglass ---
**Author:** ![jdouglass](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/jdouglass/32/9_2.png) [@jdouglass](https://community.naturalcapitalalliance.org/u/jdouglass)\ **Post date:** [October 28, 2021, 4:22pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/6 "2021-10-28T16:22:11Z")
Yep, that sounds reasonable to me, for the case where you want to consider which buildings might be affected at different flood depths. I wonder, @swolny @chris @royremme do you have any other suggestions about considering flood depth with or without InVEST? ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/naturalcapitalproject/original/2X/8/8d95591aa074da87ea0fdd61ca47c1c3c0588aa7.png) [@system](https://community.naturalcapitalalliance.org/u/system)\ **Post date:** [November 4, 2021, 4:23pm UTC](https://community.naturalcapitalalliance.org/t/urban-flood-risk-mitigation-model-flood-depth/2247/7 "2021-11-04T16:23:00Z")
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