The development proposed by this project is the drainage of 46,000 acres of swamp land in Warner Valley, the irrigation of 33,000 acres of these lands in the south end by gravity canals, and pumping to irrigate 27,000 acres in the north end.
The features to which this report has special reference are:
(a) The reclamation of about 88,000 acres of land in South Warner Valley by dredged channels for drainage and gravity canals from Deep Creek to serve these lands during irrigation.
(b) The reclamation of 27,000 acres in North Warner Valley by a drainage channel to serve 18,000 acres of these lands and control excess water, and by pumping to irrigate the entire 27,000 acres.
(c) The development of 2,000 electrical horsepower on Deep Creek for operating dredges during construction and to furnish power to four pumping plants in North Warner Valley on completion of the project.
(d) Provision for ample storage in Big Valley and Coleman Valley to insure the reclamation of the marshlands in years of extreme run-off.
...Irrigation of the marshland will probably be required after thorough drainage, and this can be at least partly accomplished by sub irrigation. The main drainage channels, if provided with control gates which may be closed when the land is nearly drained out, will help to control the water table and hold it at a favorable distance below the surface. The grass lands may be irrigated by simply using some large field laterals which will spread the water over the slopes and raise the water table to the grass roots. Grasses will generally keep green and make good growth where the water table is 1 or 2 feet below the surface. Timothy and clover should do well with the water table 3 feet from the surface, while grain and alfalfa will be better with the water table some 4 feet below the surface. On the silt loam soil the field-lateral system of distributing the water could be improved, and with the land in alfalfa probably the strip-border method would make a further improvement in time. Garden stuff or row crops would generally be irrigated by the furrow method.