The Ventura County Watershed Protection District developed a complete watershed model of the Calleguas Creek system, including Revolon Slough, using the Modified Rational Method. Sub-watersheds were carefully digitized; land surface imperviousness was compared to the latest aerial photos, and routing reaches were measured from Rocky Peak to Mugu Lagoon. The majority of watershed sub-areas are less than 100 acres, but in some rural areas, larger sub-areas seemed appropriate. For each sub area, input variables include these parameters: area in acres, time of concentration in minutes, percent effective imperviousness, hydrologic soil type, and rainfall zone with storm frequency.
For additional information, please visit the Calleguas Watershed Management Plan website.