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h1. Group 1: Benchmarks from literature (exact solution)

This section describes a number of benchmarks for which an exact analytical solution can be found in the literature.

h2. 1.1. Study Case described in "Technisch Rapport Voorland Zettingsvloeiing"

h5. Description

The example given in "Annex A - Case Study" of the Deltares report 1200503-001-GEO-0004 "Concept Technisch Rapport Voorland Zettingsvloeiing" of G.A. van den Ham & Co is used.
In this example, both global and detailed checks are completed on the basis of a (fictitious) dike section, which with regard to geometry and soil structure is typical of the Southwest Delta.
The dike has a height of NAP+5 m, a crest width of 3 m and a slope of 1:3.
The foreshore begins to imaginary toe of the dike at an elevation of NAP and is 60 m wide. The toe of the trench is NAP-15 m and has a slope of 1:6. The dike section is 800 m long. The phreatic level is at NAP-2 m.
The soil profile is as follows:
* from NAP+3.5 m to NAP+1 m: peat
* from NAP+1 m to NAP-5 m: silty clay
* from NAP-5 m to NAP-18 m: moderately to loosely compacted sand (Calais)
* from NAP-18 m to NAP-30 m: densely compacted sand

h5. Benchmarks results

The details of the calculation can be found in annex A of the report. The main results are given in the table below. The global check fails but the detailed check passes.

h5. *D-Flow Slide* results

h6. Results of benchmark 1-1 for the Global Check
|| Results || Benchmark || D-FlowFLOW SlideSLIDE || Relative error [%|%] ||
| Step 1 ||
| Marge | xxx | xxx | xxx |
| X coordinate of the observation profile (X{~}sign~) | xxx | xxx | xxx |
| X coordinate of the liquefaction point (X{~}ZV~) | xxx | xxx | xxx |
| Step 1: Is liquefaction damaging on basis of geometry? | Yes | Yes | (+) |
| Step 2: Artificially underwater installed and non-compacted sandy foreshore? | No | No | (+) |
| Step 4: Is liquefaction possible on the basis of the geometry? | Yes | Yes | (+) |
| Step 5: Are there any sensitive to liquefaction layers present? | Yes | Yes | (+) |
| Result of the Global check | Failed | Failed | (+) |

h6. Results of benchmark 1-1 for the Detailed Check