There were no locks on this part of the canal after Ash and so the route generally followed the contours of the land with occasional cuttings, tunnels and embankments. The route can be partly determined by noting that the canal falls between the 75 m and 80 m contours on Ordnance Survey maps. The main source of water for the Basingstoke end of the top pound of the canal appears to have been the natural springs within the Greywell Tunnel - old ordnance survey maps (look at http://www.ponies.me.uk/maps/osmap.html) show the River Loddon running next to but not into the canal in Basingstoke (and a visit to Eastrop Way, on the former route of the canal, shows that it is now well above the height of the nearby river Loddon) and also show a lack of any water connection from the spring at Huish Farm near Hatch (a site visit shows the Huish stream flows under the remains of the old canal bed just next to the M3). There are however small streams flowing into the top pound of the canal at Fleet and Aldershot. An attempt to alleviate the lack of water is apparent by a small lock just to the east of the Greywell tunnel, which appears to have raised the water level by about . However this was a long section of canal with many embankments and it is likely that this was a cheap short term measure to keep the canal open, in preference to plugging the leaks from the many embankment sections on the route.