Category Archives: Drainage and Flood Control

Detention Basin on University of Hawaii West Oahu Campus

University of Hawaii West Oahu; Department of Hawaiian Home Lands
Kapolei, Oahu, Hawaii

The UHWO Detention Basin project included the design of a 38.3 acre-foot detention basin with grouted rip-rap in designated areas, a graded mound, and new spillway with outlet pipes. The project included the preparation of construction plans, calculations and reports, and the processing of these items for approval by the City. In addition, CPE also prepared the bid documents and assisted the Department of Hawaiian Home Lands with the bidding process.

Local Drainage Improvements at Susupe and Chalan Kanoa

Commonwealth of the Northern Mariana Islands (CNMI), Department of Public Works; U.S. Army Corps of Engineers, Honolulu District
Saipan, CNMI

The purpose and objective of this project was to conduct studies to evaluate flooding hazards in the towns of Susupe and Chalan Kanoa, and provide the CNMI with designs for local drainage improvements based on the results of the evaluation. CPE conducted preliminary investigations and data development studies to describe the hydrologic and hydraulic assumptions, techniques, and methodologies required to evaluate improvements for local drainage in the two towns. Based on these investigations, CPE determined local drainage improvements following CNMI, DPW standards. In addition, CPE also prepared a technical hydrologic and hydraulics report.

Lalamilo Housing and Kawaihae Road Improvements

Lalamilo Housing Phase 2A, Increment 1 (Part I) and Kawaihae Road Improvements at South Kohala Distribution Road (Part II)
Department of Hawaiian Home Lands (DHHL)
Waimea, South Kohala, Island of Hawaii, Hawaii

The Lalamilo Housing Phase 2A, Increment 1 (Part I) project is an 83-lot development consisting of single-family residential lots, a HELCO substation, an archaeological preservation lot, and a community park. The Kawaihae Road Improvements require intersection improvements at these roadways. Site improvements include the South Kohala Distribution Road widening, 50-ft wide right-of-way asphalt concrete paved roads with curbs and gutters, 7-foot wide concrete sidewalks, water lines, and drainage systems with drywells.

CP&E served as the prime design consultant for Parts I and II of the Lalamilo Housing Development, and is currently providing post design services for this project. The scope of services includes engineering, processing of all applicable permits, and coordinating work with applicable federal, state, and county agencies.