Hi,
Depending on your budget or if available from your library you can also look at:
The Campaign in Mesopotamia (4 vols) by Brigadier FJ Moberly
OFFICIAL HISTORY OF THE WAR. NAVAL OPERATIONS - VOLUME III
Covers naval operations from Spring 1915 to Jutland, May 31st/1st June 1916. Describes events in Home Waters, the Dardanelles, Salonika, Mesopotamia (to November 1915), the destruction of the Koenigsberg, and the Battle of Jutland
OFFICIAL HISTORY OF THE WAR. NAVAL OPERATIONS - VOLUME IV
Covers the period from Jutland to February 1917: Home Waters, East Africa, Cameroons, Mesopotamia, the Baltic, Salonika campaign January to June 1916, operations in the Mediterranean between June 1916 and January 1917. German introduction of unrestricted submarine warfare.
INLAND WATER TRANSPORT IN MESOPOTAMIA
Topical history of water transport tol the British army along the rivers Tigris and Euphrates in Mesopotamia (Iraq) during the Great War. The problems sound very familiar.