{"id":2403,"date":"2026-10-11T14:12:45","date_gmt":"2026-10-11T12:12:45","guid":{"rendered":"https:\/\/geospector.de\/sediment-measurement-in-stormwater-retention-basins-measurement-challenges\/"},"modified":"2026-10-19T13:28:02","modified_gmt":"2026-10-19T11:28:02","slug":"sediment-measurement-retention-basins","status":"publish","type":"page","link":"https:\/\/geospector.de\/en\/sediment-measurement-retention-basins\/","title":{"rendered":"Sediment Measurement in Stormwater Retention Basins: Measurement Challenges"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2403\" class=\"elementor elementor-2403 elementor-2271\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2347837 e-flex e-con-boxed e-con e-parent\" data-id=\"2347837\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;shape_divider_bottom&quot;:&quot;waves&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-shape elementor-shape-bottom\" aria-hidden=\"true\" data-negative=\"false\">\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 1000 100\" preserveAspectRatio=\"none\">\n\t<path class=\"elementor-shape-fill\" d=\"M421.9,6.5c22.6-2.5,51.5,0.4,75.5,5.3c23.6,4.9,70.9,23.5,100.5,35.7c75.8,32.2,133.7,44.5,192.6,49.7\n\tc23.6,2.1,48.7,3.5,103.4-2.5c54.7-6,106.2-25.6,106.2-25.6V0H0v30.3c0,0,72,32.6,158.4,30.5c39.2-0.7,92.8-6.7,134-22.4\n\tc21.2-8.1,52.2-18.2,79.7-24.2C399.3,7.9,411.6,7.5,421.9,6.5z\"\/>\n<\/svg>\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8fbe28a elementor-widget elementor-widget-heading\" data-id=\"8fbe28a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Technical article \u00b7 Part 2 of 3<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae3f6bd elementor-widget__width-inherit elementor-widget elementor-widget-heading\" data-id=\"ae3f6bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Sediment Measurement in Stormwater Retention Basins: Measurement Challenges<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ab1feac elementor-widget elementor-widget-button\" data-id=\"ab1feac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/geospector.de\/en\/kontakt\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Arrange a consultation<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-13143dd e-flex e-con-boxed e-con e-parent\" data-id=\"13143dd\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4f31ba6 elementor-widget elementor-widget-text-editor\" data-id=\"4f31ba6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>Dipl.-Ing. David Mauro, Geospector Munich \u2013 article series \u201cStormwater retention facilities on federal highways\u201d<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-41afc0b elementor-widget elementor-widget-text-editor\" data-id=\"41afc0b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>This article series presents the stormwater retention facilities along Germany\u2019s federal highways, how they work and the challenges involved in operating them (design and function: see <a href=\"https:\/\/geospector.de\/en\/stormwater-retention-highways\/\">Part 1<\/a>). The second part deals with the measurement problems in determining sediment and sludge in stormwater retention basins, which pose a challenge for the safe and environmentally sound operation of the facilities.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-57d0ea9 e-con-full e-flex e-con e-child\" data-id=\"57d0ea9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-76c6393 elementor-widget elementor-widget-heading\" data-id=\"76c6393\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">At a glance<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7dc95d elementor-widget elementor-widget-text-editor\" data-id=\"c7dc95d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>For facilities with a <strong>permanent pool<\/strong>, measuring sludge is unexpectedly difficult, uncertain and laborious.<\/li><li>Sounding from inflatable boats: often <strong>2\u20133 person-days per facility<\/strong>.<\/li><li>Accuracy in the <strong>centimeter range<\/strong> is required \u2013 sub-bottom profilers only achieve decimeters to meters.<\/li><li>Drone-based measurement: <strong>a few hours on site<\/strong>, over <strong>95 %<\/strong> of all facilities can be surveyed efficiently.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f19c352 elementor-widget elementor-widget-heading\" data-id=\"f19c352\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">A seemingly simple question leads to unexpected difficulties<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1961199 elementor-widget elementor-widget-text-editor\" data-id=\"1961199\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As explained in <a href=\"https:\/\/geospector.de\/en\/stormwater-retention-highways\/\">Part 1<\/a>, the continuously increasing quantities of sludge and sediment must be checked regularly, as they increasingly impair the basic functions of the facilities. This applies above all to flood protection for downstream water bodies and to preventing pollutants from entering the environment.<\/p><p>To do this, the seemingly simple question of how much sludge there is in a facility must first be answered. If this quantity exceeds the limits specified in the operating regulations, the facility must be cleaned out.<\/p><p>For facilities with permanently impounded water (\u201cpermanent pool\u201d), this measurement is unexpectedly difficult in practice and involves great uncertainty and considerable effort.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3f8ed6e elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"3f8ed6e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"478\" height=\"305\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Rueckhaltebecken_Dauerstau.jpg\" class=\"attachment-full size-full wp-image-2236\" alt=\"Near-natural stormwater retention basin with a permanent pool and vegetated banks\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Rueckhaltebecken_Dauerstau.jpg 478w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Rueckhaltebecken_Dauerstau-300x191.jpg 300w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Stormwater retention basin with a permanent pool<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db8f0b0 elementor-widget elementor-widget-heading\" data-id=\"db8f0b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conventional sounding is only possible to a limited extent and provides only estimates<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b024dc elementor-widget elementor-widget-text-editor\" data-id=\"6b024dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In the simplest case, sounding rods are pushed through the sludge layer down to the bed from the bank; when they are pulled out, the material adhering to them directly shows the sludge depth.<\/p><p>The method can only be used in accessible edge areas. Because of the sloping banks, the deep areas of the basins with the largest sludge accumulations cannot be reached.<\/p><p>Near-natural, shallow facilities can be walked through and sounded in waders. In basins with steep walls and unknown bed depth, however, this is life-threatening at water depths of typically up to three meters and heavy silting.<\/p><p>Jetties are occasionally used as well, but overall the approach is only suitable for initial estimates.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0f4dbb9 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"0f4dbb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"472\" height=\"301\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Sondierungsstange_Ufer.jpg\" class=\"attachment-full size-full wp-image-2238\" alt=\"Sounding the sludge depth with a sounding rod from the bank\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Sondierungsstange_Ufer.jpg 472w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Sondierungsstange_Ufer-300x191.jpg 300w\" sizes=\"(max-width: 472px) 100vw, 472px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Sounding with a sounding rod from the bank \u2013 the deep areas of the basin remain out of reach<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7f8bd12 elementor-widget elementor-widget-heading\" data-id=\"7f8bd12\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Sounding from inflatable boats is very laborious, inaccurate and often impossible<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a2c92ab elementor-widget elementor-widget-text-editor\" data-id=\"a2c92ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The current state of the art is in fact small inflatable boats from which soundings are taken over as large a part of the water surface as possible. This involves considerable effort: access to the water often has to be created first, and long setup and dismantling times have to be accepted. In addition, several workers must be present at the same time for safety reasons, so a workload of 2\u20133 person-days per facility is not unusual.<\/p><p>The soundings are usually documented by hand with correspondingly inaccurate position information, which \u2013 as we will see later \u2013 can lead to large systematic errors in the volume calculation.<\/p><p>Ultimately, however, boats can only be used to a very limited extent if the water surface is not open but overgrown with dense vegetation, especially reed belts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca239b8 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"ca239b8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"478\" height=\"305\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Schilfguertel.jpg\" class=\"attachment-full size-full wp-image-2240\" alt=\"Stormwater retention facility with a dense reed belt and overgrown water surface\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Schilfguertel.jpg 478w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Schilfguertel-300x191.jpg 300w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Dense vegetation and reed belts severely restrict the use of boats<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-447fff6 elementor-widget elementor-widget-heading\" data-id=\"447fff6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Technology for large water bodies can hardly be used<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-446bf40 elementor-widget elementor-widget-text-editor\" data-id=\"446bf40\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In principle, methods for surveying seas and larger inland waters are an alternative to sounding. It turns out, however, that they can only be used to a very limited extent because of the nature of the facilities.<\/p><p>Sonar measurements, for example, cannot be used in all facilities, as dense underwater vegetation often causes interference through reflections.<\/p><p>The same applies to (costly) airborne bathymetric laser scanning (green laser light penetrates water): especially in the critical settling zones, the water is usually so turbid that measuring down to the sludge surface is often impossible.<\/p><p>So-called sub-bottom profilers, which use special sonar techniques to penetrate and map the soil layers from the water surface, also have accuracies in the decimeter or meter range and are unsuitable for the required centimeter-range accuracy.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-56c83da e-con-full e-flex e-con e-child\" data-id=\"56c83da\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-b580de7 e-con-full e-flex e-con e-child\" data-id=\"b580de7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d63ad8c elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"d63ad8c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"478\" height=\"252\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Unterwasservegetation.jpg\" class=\"attachment-full size-full wp-image-2242\" alt=\"Dense underwater vegetation in a retention basin that interferes with sonar measurements\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Unterwasservegetation.jpg 478w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Unterwasservegetation-300x158.jpg 300w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Dense underwater vegetation interferes with sonar measurements<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-80b108e e-con-full e-flex e-con e-child\" data-id=\"80b108e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8cf64d9 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"8cf64d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"478\" height=\"269\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Truebes_Wasser.jpg\" class=\"attachment-full size-full wp-image-2244\" alt=\"Underwater image of highly turbid water in the settling zone\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Truebes_Wasser.jpg 478w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Truebes_Wasser-300x169.jpg 300w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Highly turbid water in the settling zone<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f0116f elementor-widget elementor-widget-heading\" data-id=\"8f0116f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Area-wide measurements are necessary because of the irregular sludge distribution<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5da9852 elementor-widget elementor-widget-text-editor\" data-id=\"5da9852\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The distribution of sludge can vary greatly due to different flow velocities and variable bed profiles. Spot measurements at a few points are therefore insufficient; as a rule, measurements must be well distributed over the entire water surface, which is hardly feasible with conventional methods.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cacf26a elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"cacf26a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"478\" height=\"252\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Schlammverteilung.jpg\" class=\"attachment-full size-full wp-image-2246\" alt=\"Color map of an uneven, area-wide measured sludge distribution in a retention basin\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Schlammverteilung.jpg 478w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Schlammverteilung-300x158.jpg 300w\" sizes=\"(max-width: 478px) 100vw, 478px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Area-wide measured sludge distribution: high (red) and low (blue) deposits lie close together<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e5a7edc elementor-widget elementor-widget-heading\" data-id=\"e5a7edc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conventional calculation methods can lead to grossly incorrect results<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-574259a elementor-widget elementor-widget-text-editor\" data-id=\"574259a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Currently, sludge is usually determined according to the following scheme: soundings at supposedly well-distributed points, calculation of the mean value and subsequent multiplication by the water surface area give the sediment volume.<\/p><p>In small facilities with sloping banks, this can lead to grossly incorrect volumes, as the distribution of the soundings usually favors certain areas and the mean value is no longer representative. The geometry of the bed profile must therefore be taken into account. The article <a href=\"https:\/\/geospector.de\/en\/sediment-volume-determination\/\">Pitfalls in determining sediment volume<\/a> shows a sample calculation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59c8879 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"59c8879\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"477\" height=\"215\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Stichproben_Schema.jpg\" class=\"attachment-full size-full wp-image-2248\" alt=\"Diagram: spot soundings in a basin with sloping banks in plan view and cross-section\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Stichproben_Schema.jpg 477w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Stichproben_Schema-300x135.jpg 300w\" sizes=\"(max-width: 477px) 100vw, 477px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Spot soundings in a basin with sloping banks: plan view and cross-section<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d28f90d elementor-widget elementor-widget-heading\" data-id=\"d28f90d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The biggest obstacle: inaccurate plans of the bed and missing baseline surveys<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4bf6a82 elementor-widget elementor-widget-text-editor\" data-id=\"4bf6a82\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Even if a method could be found that can at least measure the course of the sediment surface, there would still be another problem that has so far ruled out the use of intelligent drone sensors, for example: calculating the sludge depth also requires the bed profile (by taking the difference). In practice, however, this is often not known with sufficient accuracy. Hardly any verified plans exist, especially for old facilities, and as a rule no baseline surveys were carried out in the empty state after the facility was built.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eadbdb7 elementor-widget elementor-widget-heading\" data-id=\"eadbdb7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Requirements for an efficient method of sediment determination<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-760e399 elementor-widget elementor-widget-text-editor\" data-id=\"760e399\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The above results in the following requirements for a measuring method that, for the first time, should make it possible to survey a wide range of different facility types with little effort:<\/p><ul><li>light, mobile, ready for immediate use<\/li><li>capture of the sediment surface and the bed<\/li><li>complete coverage of the water surface, including inaccessible areas<\/li><li>automated GPS documentation<\/li><li>consideration of the bed geometry<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cfa532f elementor-widget elementor-widget-heading\" data-id=\"cfa532f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The solution: the latest drone sensors, special methods and continuous further development<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eb5f903 elementor-widget elementor-widget-text-editor\" data-id=\"eb5f903\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The author first became aware of the topic a few years ago through discussions with customers. Because of the difficulties described above, it quickly became clear that a solution would not be trivial. After years of development, patents and a large number of project deployments, the following picture emerges:<\/p><p>Drones are indeed a decisive step toward carrying out sediment determination economically and accurately for the first time. The on-site measurements take only a few hours \u2013 compared with up to several days when boats are used. However, this requires special developments, procedures and, above all, experience.<\/p><p>A particular challenge was developing the sensors for capturing the bed profile, since near-natural facilities in particular often have dense vegetation with corresponding root systems in which the originally designed remote-controlled sensors often became entangled.<\/p><p>No two basins are alike; each requires an individual approach using a whole portfolio of different airborne, water-borne and ground-based sensors. In fact, the method can efficiently survey over 95 % of all facilities; however, it is continuously being developed and optimized on the basis of the experience gained.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8dcb9a0 elementor-widget__width-inherit elementor-widget elementor-widget-image\" data-id=\"8dcb9a0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"479\" height=\"258\" src=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Drohnen_Sensorik.jpg\" class=\"attachment-full size-full wp-image-2250\" alt=\"Geospector airborne, water-borne and underwater drone sensors for sediment measurement\" srcset=\"https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Drohnen_Sensorik.jpg 479w, https:\/\/geospector.de\/wp-content\/uploads\/2026\/10\/RRB_Teil2_Drohnen_Sensorik-300x162.jpg 300w\" sizes=\"(max-width: 479px) 100vw, 479px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Airborne, water-borne and underwater sensors of the Geospector DTS Acqua<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c21ca59 elementor-widget elementor-widget-heading\" data-id=\"c21ca59\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">A first overview from drone surveys across Germany<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-39dbbe8 elementor-widget elementor-widget-text-editor\" data-id=\"39dbbe8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The author is not aware of any comprehensive statistics to date that would allow the cleaning status of the facilities across Germany to be assessed. This is probably due above all to the high effort involved in consistent and systematic measurements, which have therefore tended to be carried out ad hoc as needed.<\/p><p>Newly developed measuring methods using drones and corresponding field deployments in recent years now make it possible for the first time to obtain a comprehensive, systematic picture of the condition of the facilities in Germany.<\/p><p>The <a href=\"https:\/\/geospector.de\/en\/sludge-depth-retention-basins\/\">third and final part<\/a> of the article series presents corresponding practical experience, statistics and recommendations derived from them.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ee96e3e e-con-full e-flex e-con e-child\" data-id=\"ee96e3e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cb12aa7 elementor-widget elementor-widget-heading\" data-id=\"cb12aa7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The article series at a glance<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9384c3c elementor-widget elementor-widget-text-editor\" data-id=\"9384c3c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"https:\/\/geospector.de\/en\/stormwater-retention-highways\/\">Part 1: Introduction and functional description<\/a><\/li><li><strong>Part 2: Measurement challenges for safe operation<\/strong> (this article)<\/li><li><a href=\"https:\/\/geospector.de\/en\/sludge-depth-retention-basins\/\">Part 3: Findings from drone surveys across Germany<\/a><\/li><li><a href=\"https:\/\/geospector.de\/en\/sediment-volume-determination\/\">Supplement: Pitfalls in determining sediment volume<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b0e18d9 e-con-full e-flex e-con e-child\" data-id=\"b0e18d9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f85649f elementor-widget elementor-widget-heading\" data-id=\"f85649f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Have the sludge depth in your facilities measured?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-791b36c elementor-widget elementor-widget-text-editor\" data-id=\"791b36c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>With the <a style=\"color:#FFFFFF;text-decoration:underline\" href=\"https:\/\/geospector.de\/en\/sedimentbestimmung\/\">Geospector Sludge Check<\/a>, we survey the sediment surface and bed of your stormwater retention facilities area-wide by drone \u2013 without a boat and without the need for an existing baseline survey.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-75f32cc elementor-widget elementor-widget-button\" data-id=\"75f32cc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/geospector.de\/en\/kontakt\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Arrange a consultation<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9ea3d24 e-con-full e-flex e-con e-child\" data-id=\"9ea3d24\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-86c2180 elementor-widget__width-inherit elementor-widget elementor-widget-heading\" data-id=\"86c2180\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">The full article is also available as a PDF download (in German).<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c67d87b e-flex e-con-boxed e-con e-child\" data-id=\"c67d87b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<a class=\"elementor-element elementor-element-42d0a94 e-con-full e-flex e-con e-child\" data-id=\"42d0a94\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\" href=\"https:\/\/geospector.de\/wp-content\/uploads\/2024\/08\/Geospector_RRB_2_Sedimentmessung.pdf\" target=\"_blank\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2514aaf elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"2514aaf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<div class=\"elementor-icon\">\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"40\" height=\"41\" viewBox=\"0 0 40 41\" fill=\"none\"><g clip-path=\"url(#clip0_131_932)\"><path d=\"M35.848 14.808H34.82L34.874 11.028C34.8675 10.8071 34.7824 10.5958 34.634 10.432L25.802 0.768C25.7311 0.686925 25.6442 0.621299 25.5468 0.575196C25.4495 0.529094 25.3437 0.503498 25.236 0.5H6.75599C6.34165 0.506652 5.94605 0.673802 5.65247 0.966265C5.35889 1.25873 5.19023 1.65369 5.18199 2.068V14.808H4.15199C3.58199 14.808 3.03199 15.044 2.63199 15.464C2.22387 15.8909 1.9973 16.4594 1.99999 17.05V28.71C1.99999 29.946 2.96399 30.95 4.15199 30.95H5.18199V38.93C5.18974 39.3453 5.35873 39.7414 5.65322 40.0344C5.94771 40.3274 6.34461 40.4944 6.75999 40.5H33.316C34.146 40.5 34.876 39.796 34.876 38.932V30.952H35.85C37.038 30.952 38.002 29.946 38.002 28.708V17.048C38.002 16.456 37.776 15.884 37.372 15.464C37.176 15.2577 36.9403 15.0933 36.6791 14.9805C36.4179 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11.264 19.076C10.98 19.022 10.406 18.996 9.54399 18.996L8.38999 18.994ZM16.47 16.964H20.838C21.824 16.964 22.574 17.04 23.092 17.194C23.786 17.4 24.38 17.77 24.876 18.298C25.37 18.828 25.748 19.476 26.006 20.242C26.266 21.01 26.394 21.954 26.394 23.078C26.394 24.066 26.274 24.918 26.03 25.632C25.734 26.506 25.31 27.212 24.762 27.752C24.348 28.162 23.788 28.482 23.082 28.712C22.556 28.88 21.85 28.964 20.968 28.964H16.47V16.964ZM18.86 18.994V26.942H20.644C21.312 26.942 21.794 26.904 22.09 26.828C22.478 26.728 22.8 26.564 23.054 26.328C23.31 26.094 23.52 25.708 23.68 25.17C23.842 24.632 23.922 23.9 23.922 22.972C23.922 22.044 23.842 21.332 23.682 20.836C23.555 20.3984 23.3213 19.9991 23.002 19.674C22.6933 19.3859 22.3102 19.1898 21.896 19.108C21.562 19.032 20.908 18.994 19.936 18.994H18.86ZM27.886 28.964V16.964H36V18.994H30.276V21.834H35.216V23.864H30.276V28.964H27.886Z\" fill=\"#CA3728\"><\/path><\/g><defs><clipPath id=\"clip0_131_932\"><rect width=\"40\" height=\"40\" fill=\"white\" transform=\"translate(0 0.5)\"><\/rect><\/clipPath><\/defs><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-85c9494 elementor-widget elementor-widget-heading\" data-id=\"85c9494\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\">Part 2: Measurement challenges (PDF in German)<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Technical article \u00b7 Part 2 of 3 Sediment Measurement in Stormwater Retention Basins: Measurement Challenges Arrange a consultation Dipl.-Ing. David Mauro, Geospector Munich \u2013 article series \u201cStormwater retention facilities on federal highways\u201d This article series presents the stormwater retention facilities along Germany\u2019s federal highways, how they work and the challenges involved in operating them (design [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":457,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-2403","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sediment Measurement in Stormwater Retention Basins: Measurement Challenges - Geospector<\/title>\n<meta name=\"description\" content=\"Why is sediment measurement in stormwater retention basins with a permanent pool so difficult? 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