4. Hydraulic and earth engineering
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On-site sewage treatment and disposal system

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Open top drain

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Open top drain

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Optimum water retention system for use in agricultural fields

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Orifice shield for a drainage conduit in a wastewater...

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Reexamination Certificate

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Orifice shield for drainage pipe

Hydraulic and earth engineering – Drainage or irrigation – Having regulation of flow through channel
Reexamination Certificate

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Outwardly dished end plate for stormwater chamber

Hydraulic and earth engineering – Drainage or irrigation – End cap
Reexamination Certificate

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