A drainage plan is a proposed method to contain rainwater on your property, so that it does not build up on your foundations, nor spill on the property of your neighbors, perhaps even causing flooding. Many counties require drainage plans to control any increase in the amount of rainwater that escapes from each property as a result of the development of that property.

Almost any of the land developments involved in the construction of a house built with sticks increases the amount of rain that can run after a heavy storm. The removal of trees and shrubs reduces the amount of water absorbed by the roots and the subsequent evaporation through the leaves of the plants. Covering the land with the house, access roads and other waterproof covers prevents the underlying soil from accepting water from the surface. While bare earth can easily absorb soil, a grass lawn can make it less absorbent. The trucks that circulate on the ground during and after the construction compact the surface.

These and other factors can be combined to decrease the capacity of the native soil to absorb rainfall and cause the water to "stop" or "accumulate". If the grouping is prolonged long enough, it may eventually extend to the crawl space or to the property of its neighbor. To avoid this, a drainage plan is required to show that it has been addressed.
Most of the time, this type of plan will be required before the construction department issues a construction permit.

The standard method for controlling stormwater runoff from the roof is to make the water flow down and then to a dry well. The criteria for this is that an area on your property must be available for the dry well that does not conflict with any septic drainage field, foundations of public structures or wells.

AEC Moreno Corp. builds throughout Southern California including: 

Inland Empire, Rancho Cucamonga, Claremont, Upland, San Dimas, La Verne, Walnut, Diamond Bar, Yorba Linda, Anaheim Hills, Brea, Redlands, Yucaipa

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