Our system’s preliminary design takes our conceptual design and improves on quite a few components of it.

 

Picture6

It has moved into a single chamber design with a weir between the inflow and outflow pipes. This design has 3 Plexiglas lids (for ease of access inside the vault for maintenance),  high strength concrete, a waterproof “Job box” (shown in green), a small NEMA type-4 enclosure, a ladder for access, and bolt fittings for each of the boxes and for the Plexiglas lid. The Job Box will store the sample collectors and the NEMA box will store the Arduino, a small computer the team has configured for measurement recording purposes. The vault sizing is as follows:

Internal dimensions (Length x Width x Height):
  8 ft x 4 ft x 8 ft
Thickness:
  8 inches
Concrete Mix Strength:
  4.5 ksi
Steel Reinforcement Strength:
  60,000 ksi
The samplers used will be Teledyne/ISCO 6712C , one sample will be taken before the flow has been filtered and another post-filtration. It will house 12 seperate samples each and is programmable to take samples during a rain even of a certain size or at certain increments throughout the day. Our goal is to have the Arduino alert the client when the samplers are full and need to be collected.
A rain gauge will be used for the system and will likely be mounted atop the NEMA box: the Teledyne/ISCO 674 Rain Gauge. This is a very durable and accurate rain gauge (±1% at 2 in/hour) and will be very compatible with the sampler we have chosen for the system.
A flow meter will be placed at the beginning of the pipe: the Teledyne/ISCO 750 Area Velocity Flow Module. This module will collect flow once the size of the pipe is programmed into the system and it will measure the velocity using an ultrasonic Doppler system and the level using a submerged pressure transducer. with these three parameters, the module calculates the flow rate and sends that information to the 6712C, to which it is directly connected.
The soil moisture gauge, so the client can know how much moisture the soil is collecting during a certain rain event, will be the WaterScout SM100 Soil Moisture Gauge. This gauge has the ability to transmit data wirelessly and has an outstanding battery life.
Here’s a simplified version of our electrical components for our system:
Picture9

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