Coastal Resource Conservation District
 
Vard Ikeda-Ikeda Bros Farming-Conservation Project Success
 
 Construction images.
The Ikeda Underground Outlet (620) project consisted of installation of 3040 feet of 36 inch diameter, water-tight, soil-tight, High Density Polyethylene (HDPE) drain pipe and a 75 foot concrete weir type plunge basin to dissipate energy and settle out sediment.  The 3040 foot long pipeline, with a design capacity of approximately 63 cubic feet per second, collects runoff by way of 7 catch basins. In order to burn up energy, the runoff is routed and then plunges into the basin. After flowing over the weir, the water filters slowly through a 75 foot wide by 40 foot long filter strip of native grass. The water then flows through an upland terrace of native, drought tolerant, grasses, shrubs and trees, finally flowing through an existing vegetated terrace which grades to the existing riparian zone of the Arroyo Grande Creek. The function of the 75 foot wide weir and filter strip is to reduce the velocity and energy of the water, reducing the potential for erosion and enhancing the settling out of sediment. The strategy of the basin was to provide an outlet to Arroyo Grande Creek that would be environmentally friendly by reducing the overall sediment loading into the creek, spreading the flow out over a large area, and filtering the water prior to entering the creek.
 

Staked mainline of Underground Outlet (620) prior to construction.

Staked mainline through disked vegetable fields. Landowner had to disk under fields for mainline construction and did lose quite a bit of production during construction.

Pipe ready to go in the ground on recently disked vegetable fields.

First phase of mainline of Underground Outlet Pipeline being installed.

Installation of first phase of Underground Outlet and inlet installation.

Installation goes through field of cabbage.

Digging for Inlet installation.

Inlet installation.

Lining up SWCA lateral pipeline construction with inlets.

Lowering SWCA lateral pipeline into trench.

Checking installation of connection to inlet assembly.

Checking installation of connection to inlet assembly.

View looking "upstream" to where pipline had already been installed and fields were now planted.

Beginning excavation for Energy Dissipating Basin. Underground Outlet pipeline terminus.

Excavation of Energy Dissipating Basin and filter strip looking north.

Excavation of Energy Dissipating Basin and filter strip looking north east.

Excavation of Energy Dissipating Basin and filter strip looking north.

Excavation of actual basin area looking west.

Excavation of Energy Dissipating Basin and filter strip looking east.

After first concrete pour of basin and initial vegetation establishment (Critical Area Planting (342)seeding and mulching).

After consecutive concrete pours of basin and vegetation has been irrigated and fairly well established.

Early January 2007 picture of completed basin and established vegetation.
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Click Here for images of the Vegetation Establishment
Click Here for images of the SWCA Lateral Installation
Project completed with funding assistance by:
Natural Resources Conservation Service And State Coastal Conservancy
With coordination by the Coastal San Luis Resource Conservation District
In addition this project received support through a grant from the
State Water Resources Control Board and US Environmental Protection Agency
(under Federal Non-point Source Pollution Control Program Clean Water Act Section 319H)