Kawai Nui Stream, the natural outlet for Kawai Nui Marsh, is now cut off from the marsh by an earthen levee at Coconut Grove in Kailua. A report (Swain and Huxel, 1971) prepared by the USGS makes it clear that there is no seepage through the levee at Coconut Grove from the marsh. Hence, Kawai Nui Stream no longer receives water from the marsh or contributes to it.1
This channel begins as a drainage canal on the makai side of the Kawai Nui marsh levee at Kaha Park, receiving runoff from the Coconut Grove neighborhood of Kailua. Water is directed southeastward to Kailua Road and Hamakua marsh just beyond (see map). The canal ends abruptly at Awakea Road, where culverts carry the water to the other side. Beyond, the "stream" continues as a canal to the confluence with Kaelepulu Stream (draining Kaelepulu Pond or Enchanted Lake). The outlet for Kaelepulu Stream or Channel is at Kailua Beach Park.
See article on Hamakua Marsh restoration: Star Bulletin.
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1 (modified from) Linda L. Smith. 1978. Development of emergent vegetation in a tropical marsh. MS Thesis, U.H., Botany. p. 19-20.
Swain, L.A. and C.J. Huxel. 1971. Relation of drainage problems to high ground-water levels, Coconut Grove area, Oahu, Hawaii. U.S. Geological Survey, Honolulu.