The moat was filled from Durleigh brook, a tributary of the River Parrett. There is some evidence that there was a weir between the moat and the river. Unusually, the main entrance opposite the Cornhill was built with a pair of adjacent gates and drawbridges.
The defensive water feature surrounding the castle was filled from Durleigh brook, a tributary of the River Parrett. There is some evidence that there may have been an obstruction between the moat and the river. Interestingly, the main entrance on the opposite side of Cornhill was constructed with two adjacent gates and drawbridges.