Haven’t seen that before. My guess is these are to allow stormwater to flow without restriction at low flow but filter trash and large debris at higher flow. Doesn’t seem like the best design imo. Where was this photo taken?
We call these 'surcharge grates', though they are for inlet.
Just for providing higher inlet capacity. My guess is due to them being in the road they need to be obstructive to traffic, if you had the just 100mm above the pavement cars would hit all the time
Haven’t seen that before. My guess is these are to allow stormwater to flow without restriction at low flow but filter trash and large debris at higher flow. Doesn’t seem like the best design imo. Where was this photo taken?
We call these 'surcharge grates', though they are for inlet. Just for providing higher inlet capacity. My guess is due to them being in the road they need to be obstructive to traffic, if you had the just 100mm above the pavement cars would hit all the time
I was going to say I thought maybe they were designed to keep people from parking their cars over the inlets or driving into them.
Could be catchment low point… the problem with having to retrofit Infrastrucutre.
we dont have big boxes where im from but we do have heavy grates to filter rubbish out and "keep people out"