"small hydraulic" is correct and can be used in written English.
It is often used in technical contexts to refer to small hydraulic systems. For example, "The small hydraulic system powered the mechanism with ease."
A couple of times we used the small hydraulic press for small batches of grapes.
"We're working in a building on the Île de la Cité, and it costs only about $10,000 a floor for a small hydraulic elevator.
Her dormitory room was custom-fitted by Harvard technicians with a hospital bed, small hydraulic lift, panic button and electronic door opener.
This heat exchanger is characterized by small hydraulic diameter, high porosity and uniform gas temperature distribution.
A fin configuration of small hydraulic diameter was employed to minimise the additional pressure drop.
The evaporator uses small hydraulic diameter, flat multi-channel tubes and louver fins.
Accomplishing these goals is commonly done through revegetation campaigns, construction of small-scale hydraulic works, contour terracing, and urban development planning, among others.
Both methods are based on field data such as water levels, discharge rates of irrigation wells, geological observations and the results of small-scale hydraulic tests.
At Da= 10−3, the smaller hydraulic resistance of porous medium results in enhanced convection.
This is because this design provides the shortest rib distance and smallest hydraulic diameter.
Non-Darcian flow results in significantly lower calculated T values, which translates to smaller hydraulic aperture values.
