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2. Impervious surface - Wikipedia

   en.wikipedia.org/wiki/Impervious_surface

   An estimation of PIMP is given by PIMP = 6.4J^0.5 where J is the number of dwellings per hectare (Butler and Davies 2000). For example, woodland has a PIMP value of 10%, whereas dense commercial areas have a PIMP value of 100%. This variable is used in the Flood Estimation Handbook. Graph of impervious surface coverage in the US. [5] [6]

3. Floor area ratio - Wikipedia

   en.wikipedia.org/wiki/Floor_area_ratio

   In Australia floor space ratio (FSR) is used in New South Wales [5] and plot ratio in Western Australia. [6] In France coefficient d'occupation des sols (COS) is used. In Brazil, Coeficiente de Aproveitamento (CA) is used. In Germany Geschossflächenzahl (GFZ) is used. Not to be confused with Grundflächenzahl (GRZ), which is the Site Coverage ...

4. Runoff curve number - Wikipedia

   en.wikipedia.org/wiki/Runoff_curve_number

   Natural desert landscaping (pervious area only) 63: 77: 85: 88 Artificial desert landscaping (impervious weed barrier, desert shrub with 1- to 2-inch sand or gravel mulch and basin borders) 96: 96: 96: 96 Urban districts Commercial and business (85% imp.) 89: 92: 94: 95 Industrial (72% imp.) 81: 88: 91: 93 Residential districts by average lot size

5. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

6. How much homeowners insurance do I need? - AOL

   www.aol.com/finance/much-homeowners-insurance...

   In California, this coverage is offered through the California Earthquake Authority. Sinkhole coverage: Sinkholes occur in many regions of the U.S. but are not covered by a standard homeowners policy.

7. USDA soil taxonomy - Wikipedia

   en.wikipedia.org/wiki/USDA_soil_taxonomy

   About 1,000 soil subgroups are defined in the United States. [6] A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include ...