{"id":738591,"date":"2026-06-02T15:20:30","date_gmt":"2026-06-02T15:20:30","guid":{"rendered":"https:\/\/www.nidaplast.com\/realisations\/bassin-infiltration-optibox-lotissement\/"},"modified":"2026-06-04T09:23:54","modified_gmt":"2026-06-04T09:23:54","slug":"soakaway-crate-under-road-housing-development-moisenay","status":"publish","type":"realisations","link":"https:\/\/www.nidaplast.com\/en\/case-studies\/soakaway-crate-under-road-housing-development-moisenay\/","title":{"rendered":"OPTIBOX soakaway crate under road \u2014 17-lot housing development, Seine-et-Marne (77)"},"content":{"rendered":"\t\t
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This buried infiltration basin was installed in 2026 at Moisenay (77950), Seine-et-Marne, as part of the servicing works for a 17-lot housing development.<\/p>

The structure, built using OPTIBOX modules, achieves a useful storage volume of 41 m\u00b3 in a single layer \u2014 overall structure depth: 0.66 m \u2014 over a footprint of 27 m \u00d7 2.4 m (64.8 m\u00b2).<\/p>

Stormwater is discharged by infiltration into the ground, with flow regulated at 1 l\/s. The structure is overlaid by a single-lane access road serving the development.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t

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2026<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Year of installation<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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41 m3<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Storage capacity<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Road<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Type of overburden<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Project context \u2014 stormwater management for a new housing site<\/h2>\t\t\t\t<\/div>\n\t\t
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As part of the servicing works at Moisenay, the design engineer specified a buried infiltration basin to manage stormwater runoff from the roofs and roads of the new residential scheme.<\/p>

The primary constraint: installing the structure within a very narrow, linear footprint \u2014 entirely beneath a single-lane access road. This configuration, typical of peri-urban housing developments, requires a low-profile storage module capable of sustaining vehicular (VL) loading while maintaining adequate storage volume.<\/p>

The OPTIBOX, with its 0.66 m single-layer structure depth and short-term vertical compression resistance exceeding 420 kPa (NF EN 17150), was the precise response to these requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Technical data \u2014 a flow-regulated infiltration basin<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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The structure operates as an infiltration basin with a flow regulator set at 1 l\/s, controlling discharge to the downstream network during storm events. The adopted layout delivers a total useful volume of 40.7 m\u00b3.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Layout and geometry<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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The linear site constraint led to a basin geometry of 27 m \u00d7 2.4 m, single layer, giving a structure depth of 0.66 m. This elongated layout \u2014 suited to the narrow strip of land along the roadway \u2014 demonstrates OPTIBOX’s ability to conform to atypical footprints that bulkier solutions cannot accommodate.<\/p>

The structure is wrapped on all faces in a 300 g\/m\u00b2 geotextile, preventing fine soil particles from migrating into the structure and maintaining permeability throughout its service life.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t

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Technical characteristics of the installed product<\/h3>\t\t\t\t<\/div>\n\t\t
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Module dimensions:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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1,200 x 600 mm.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Module depth:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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660 mm.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Storage capacity:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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\u2265 95\u202f%.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Material:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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Recycled polypropylene \u2014 recyclable<\/p>\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>\n\t\t\t\t

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\"Optibox\"

Optibox<\/p>

The Optibox system<\/strong>, with a 95% void ratio, represents a new generation of SAUL units with three-dimensional diffusion. It provides temporary stormwater storage and enables the construction of underground public or private structures that can be inspected and easily hydro-cleaned.<\/p>View product sheet<\/a><\/div><\/div><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t

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Site programme<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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For any underground structure project, our Design & Sizing team provides the technical drawings and layout plan tailored to your scheme.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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1. Excavation and preparation<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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Works took place on a plot to the west of the development, bounded by a historic stone wall (to be demolished in a subsequent phase to create vehicular access). The excavation was carried out to the basin width, with a 0.50 m working margin around the perimeter, in accordance with OPTIBOX installation requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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2. Geotextile and module installation<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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A bedding layer and 300 g\/m\u00b2 geotextile were laid in the base of the excavation before module installation. The OPTIBOX half-modules were then positioned layer by layer, following the layout plan provided by the Nidaplast technical team. No tools are required: the integrated self-locking system allows modules to be clipped together by hand, significantly reducing installation time in this confined trench.<\/p>

Integrated handling grips on each half-module simplified individual piece handling, even at the base of a narrow excavation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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3. Basin closure and hydraulic connections<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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OPTIBOX peripheral panels closed the structure on all faces. Two inspection manholes were connected upstream and downstream, including the 1 l\/s flow regulator at the outlet. The geotextile was then folded back over the top face of the modules before backfilling.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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4. Overburden \u2014 beneath a single-lane road<\/h4>\t\t\t\t<\/div>\n\t\t\t\t
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The structure is overlaid by a single-lane road surface serving all 17 plots.<\/p>

The OPTIBOX permanent admissible load (>40 kPa long-term, safety factor \u00d72 extrapolated to 50 years) and maximum overburden depth of 2 m comfortably meet the requirements of a residential VL road.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Key points noted by the design engineer<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Geometric adaptability<\/strong> \u2014 the 27 m \u00d7 2.4 m linear layout demonstrates that OPTIBOX can occupy footprints that large-format modules cannot.<\/p>

Installation speed<\/strong> \u2014 the absence of clips or specialist tooling allowed a standard VRD crew to install the structure without dedicated training.<\/p>

Road-compatible loading<\/strong> \u2014 the module’s mechanical resistance (>420 kPa short-term) is rated for VL traffic loads, including compaction of overburden layers.<\/p>

Design traceability<\/strong> \u2014 Nidaplast’s layout study gives the design engineer and VRD contractor a precise installation plan, a reference cross-section, and a complete materials schedule from tender stage.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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NIDAPLAST CASE STUDY \u2014 OPTIBOX
Project: Buried infiltration basin \u2014 SAUL 3D diffusion type \u2014 under access road
Scheme: 17-lot housing development \u2014 Moisenay (77950), Seine-et-Marne, France
Product: OPTIBOX Nidaplast \u2014 3D diffusion underground stormwater module
Basin type: Infiltration basin with regulated outflow (1 l\/s)
Useful volume: 40.7 m\u00b3 \u2014 Footprint: 27 m \u00d7 2.4 m \u2014 Area: 64.8 m\u00b2
Number of layers: 1 \u2014 Structure depth: 0.66 m
Modules installed: 181 OPTIBOX half-modules + 99 peripheral panels
Geotextile: 203 m\u00b2 at 300 g\/m\u00b2
Context: Narrow linear footprint, overburden beneath single-lane VL road
Key feature: Tool-free assembly, integrated self-locking system
Manufacturer: Nidaplast \u2014 Fresnes-sur-Escaut, Hauts-de-France, France
Standards: NF EN 17150 \u2014 Compression resistance >420 kPa (short-term)
SuDS relevance: Infiltration basin \u2014 complies with Building Regulations Part S \/ CIRIA C753 principles<\/p>\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\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

This buried infiltration basin was installed in 2026 at Moisenay (77950), Seine-et-Marne, as part of the servicing works for a 17-lot housing development. The structure, built using OPTIBOX modules, achieves a useful storage volume of 41 m\u00b3 in a single layer \u2014 overall structure depth: 0.66 m \u2014 over a footprint of 27 m \u00d7 […]<\/p>\n","protected":false},"featured_media":736534,"template":"","meta":{"_acf_changed":false},"univers":[375],"categorie-realisation":[434],"class_list":["post-738591","realisations","type-realisations","status-publish","has-post-thumbnail","hentry","univers-environment","categorie-realisation-underground-basins"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations\/738591","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations"}],"about":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/types\/realisations"}],"version-history":[{"count":12,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations\/738591\/revisions"}],"predecessor-version":[{"id":741751,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations\/738591\/revisions\/741751"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media\/736534"}],"wp:attachment":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media?parent=738591"}],"wp:term":[{"taxonomy":"univers","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/univers?post=738591"},{"taxonomy":"categorie-realisation","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/categorie-realisation?post=738591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}