Description

The model calculations provide a nationwide overview of • Depth of ground water at a resolution of 100x100 meters and 500x500 metres • Ground water level (DVR90) in a resolution of 100x100 metres; • The moisture content of the root zone in a solution of 100x100 metres; • Water flow in watercourses for 62.726 calculation points from 1/1 1990 to 31/12 2019. The model calculations can be used for screening of off-road hydrological conditions over time (day, monthly, seasonal and annual values) and for a number of statistical sizes. The statistical calculations have been made for the full 30-year period, as well as for each of the four seasons (winter, spring, summer, autumn) and the 12 months (January, Feb...) over the 30 years. The statistically processed products have been chosen in close dialogue with users, and they correspond to statistical deliveries of calculated climate change for the depth of ground water, water flow and soil water content. DK-model HIP calculations for depth to off-road groundwater and water flow in streams have been set up and calibrated with a focus on overall regional conditions, and the model calculations cannot therefore be expected to be directly applicable to solving local-specific problems. Model calculations for soil moisture content are neither calibrated nor validated and therefore the uncertainty is not known. Modelling should generally be used primarily for screening. The use of the model calculations must always be assessed individually for each task according to the nature of the task and what detail and precision is required, but data can be used as a basic basis together with other available data and local knowledge. The model calculations are useful for climate adaptation, as planning and prioritisation tool for urban planning, etc., sizing of water infrastructure, design of drainage systems, etc., assessment of flood risk from groundwater and watercourses, river and groundwater management, climate-resilient risk assessment for soil and groundwater pollution as well as in relation to agriculture. In cities/dense settlements, at major transport facilities, in areas close to the coast and complex geological conditions, uncertainty on modelled depth to off-road groundwater may be greater. The same applies to water flow in small catchment areas. Please note that %-show deviations can be relatively misleading for small water flows below 0.1 m³/s. Specification for depth to off-road groundwater: In areas where the modelled depth of ground water is above ground, the depth is set as default to 0 metres below ground. This is done on the basis of the assumption that these are local artesian conditions that the model does not take into account. There may be sharp drops in depth to off-road groundwater from one day to the next. The reason is model technology. Water content specifications: With the chosen model setup for DK model HIP (MIKE SHE), the entire root zone is represented as one aggregated layer in the model, i.e. the values should be perceived as the average soil moisture across the entire root zone. The depths of the root zone change over the course of each year based on a typical seasonal development. Root zone depths are parametrised depending on the soil type and vegetation type. For farmland in crop rotation, the root depths are changed to reflect the seasonal variation. In periods when the root zone depth changes, typically at the beginning and towards the end of the growing season, it may appear as artifacts in the water content of the affected cell. For example, there are cases where water content increases due to an increase in the root zone in spring: Although the root zone is dry, for example, in April, the development of the root depth in this month “when it grows deeper” into saturated parts of the model may cause the root zone’s water content to increase (without actually adding water through precipitation). Because the distribution of the different crops on agricultural land is based on statistics at municipal level, but randomly within each municipality, the root zone depth and seasonal development on agricultural land should be handled accordingly. Data primarily provides an overview on a slightly larger scale, and is not necessarily correct for the individual site-specific grid. Data do not necessarily reflect the evolution of crop selection over the full historical period (the statistical breakdown is based on a single year). Furthermore, root depth development is assumed with the same time development for all vegetation types each year, independent of climatic conditions. It gives some uncertainty on e.g. daily values and min/max for each month. Characteristics of water flow in watercourses: In the case of confluence between inflows and main races, there are double points in main races with the same coordinates describing the upstream and downstream flow respectively. It is possible to distinguish these in the description of the watercourse point, where “downstream” indicates downstream input in time series data.

Resources

Name	Format	Description	Link
	0		https://api.dataforsyningen.dk/hip_gvs_100m?service=WMS&request=GetCapabilities&token=
	0		https://api.dataforsyningen.dk/hip_dtg_10m_100m?service=WMS&request=GetCapabilities&token=
	0		https://api.dataforsyningen.dk/hip_vandfoering?service=WMS&request=GetCapabilities&token=
	48		https://docs.dataforsyningen.dk/#hydro-model_v1.0.0
	0		https://api.dataforsyningen.dk/hip_time?service=WMS&request=GetCapabilities&token=

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