TIDES AND TIDAL STREAMS It has been reported that the tidal streams at choke points along the Khawr ’Abd Allah and Khawr Shityanah, as far as Umm Qasr, reach up to 6 knots. Extreme care should be taken when in the area at lower low water; the tidal height has been reported to be one metre less than expected. In addition, a north-westerly wind can lower the height of tide by up to 0·2m and delay high and low water by about 30 minutes; a south-easterly wind will have the opposite effect.