A big green (brown) fast wave that you can front surf and carve around on to your hearts content. The shape of the waves favours longer (faster) boats.
The best parking spot (i.e. the one that causes least bother to locals) is the public car parks near the Trent Lock Inn. Once on the water, paddle downstream ~300m, avoid turning left onto the canal. Just after the railway bridge is the weir - it’s possible to paddle past the bouys on the left. Getting back you have two choices - put in above the weir and paddle upstream, which can be a challenge in high flows / wind, or paddle downstream a few hundred meters and turn left to come back along the canal cut, portaging the lock.
Rainchasers is best experienced as an app.