The present Waikīkī has a land area of approximately 500-acres; it once was a vast marshland whose boundaries encompassed more than 2,000-acres.
Consistent with the character of the swampy land of ancient Waikīkī, where water from the upland valleys would gush forth from underground, the name Waikīkī, which means “water spurting from many sources.”
Three main valleys Makiki, Mānoa, and Pālolo are mauka of Waikīkī and through them their respective streams (and springs in Mānoa (Punahou and Kānewai)) watered the marshland below.
As they entered the flat Waikīkī Plain (and merge and separate,) the names of the streams changed; the Mānoa became the Kālia and the Pālolo became the Pāhoa (they joined near Hamohamo (now an area mauka of the Kapahulu Library.))
While at the upper elevations, the streams have the ahupuaʻa names, at lower elevations, after merging/dividing, they have different names, as they enter the ocean, Pi‘inaio, ‘Āpuakēhau and Kuekaunahi.
The Pi‘inaio (Makiki) entered the sea at Kālia (near what is now Fort DeRussy as a wide delta (kahawai.))
The ‘Āpuakēhau (Mānoa and Kālia,) also called the Muliwai o Kawehewehe (“the stream that opens the way” on some maps,) emptied in the ocean at Helumoa (between the Royal Hawaiian and Moana Hotels.)
The Kuekaunahi (Pālolo) once emptied into the sea at Hamohamo (near the intersection of ‘Ōhua and Kalākaua Avenues.) The land between these three streams was called Waikolu, meaning “three waters.”
The early Hawaiian settlers, who arrived around 600 AD, gradually transformed the marsh into hundreds of taro fields, fish ponds and gardens. Waikīkī was once one of the most productive agricultural areas in old Hawai‘i.
Beginning in the 1400s, a vast system of irrigated taro fields and fish ponds were constructed. This field system took advantage of streams descending from Makiki, Mānoa and Pālolo valleys which also provided ample fresh water for the Hawaiians living in the ahupua‘a.
By the time of the arrival of Europeans in the Hawaiian Islands during the late eighteenth century, Waikīkī had long been a center of population and political power on O‘ahu.
Following the Great Māhele in 1848, many of the fishponds and irrigated and dry-land agricultural plots were continued to be farmed, however at a greatly reduced scale (due to manpower limitations.)
In the 1860s and 1870s, former Asian sugar plantation workers (Japanese and Chinese) replaced the taro and farmed more than 500-acres of wetlands in rice fields, also raising fish and ducks in the ponds.
By 1892, Waikīkī had about 550-acres planted in rice, representing almost 12% of the total 4,700-acres planted in rice on O‘ahu.
Nearly 85% of present Waikīkī (most of the land west of the present Lewers Street or mauka of Kalākaua) were in wetland agriculture or aquaculture.
However, drainage problems started to develop in Waikīkī from the late nineteenth century because of urbanization, when roads were built and expanded in the area (thereby blocking runoff) and when a drainage system for land from Punchbowl to Makiki diverted surface water to Waikīkī.
During the 1920s, the Waikīkī landscape would be transformed when the construction of the Ala Wai Drainage Canal, begun in 1921 and completed in 1928, resulted in the draining and filling in of the remaining ponds and irrigated fields of Waikīkī.
Soon after, in 1928, the construction of the Royal Hawaiian Hotel was completed (joining the Moana Hotel (1901,) marking the beginning of Waikīkī as a world-class tourist attraction.
The image shows a Google Earth base image with the streams, ponds and loʻi/rice fields that were noted on an 1893 map of the region. (The dark blue notes the streams (Piʻinaio, Āpuakēhau and Kuekaunahi (L to R)) – the far right water feature is part of Kapiʻolani Park, including McKee Island.) The light blue notes the fishponds and the green notes the areas that were once in taro loʻi and then rice cultivation. The yellow line notes the shoreline in 1893.)
In addition, I have added other images in a folder of like name in the Photos section on my Facebook and Google+ pages.