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2. Five Advantages of a Gravel Driveway - AOL

   www.aol.com/lifestyle/five-advantages-gravel...

   Generally speaking, gravel driveways cost about $1 to $3 per square foot, according to Angi's List, which is much cheaper than asphalt ($7 to $15) or concrete ($4 to $15). The total cost depends ...

3. Check dam - Wikipedia

   en.wikipedia.org/wiki/Check_dam

   Before installing a check dam, engineers inspect the site. Standard practices call for the drainage area to be ten acres or less. [3] [9] The waterway should be on a slope of no more than 50% and should have a minimum depth to bedrock of 2 ft (0.61 m). [14] Check dams are often used in natural or constructed channels or swales.

4. Rain garden - Wikipedia

   en.wikipedia.org/wiki/Rain_garden

   When an area's soils are not permeable enough to allow water to drain and filter at an appropriate rate, the soil should be replaced and an underdrain installed. Sometimes a drywell with a series of gravel layers near the lowest spot in the rain garden will help facilitate percolation and avoid clogging at the sedimentation basin. [13]

5. Bioswale - Wikipedia

   en.wikipedia.org/wiki/Bioswale

   They consist of a swaled drainage course with gently sloped sides (less than 6%). [2]: 19 Bioswale design is intended to safely maximize the time water spends in the swale, which aids the collection and removal of pollutants, silt and debris. Depending on the site topography, the bioswale channel may be straight or meander.

6. Advanced Drainage Systems - Wikipedia

   en.wikipedia.org/wiki/Advanced_Drainage_Systems

   Advanced Drainage Systems, Inc. (ADS) designs, manufactures and markets polypropylene and polyethylene pipes, plastic leach field chambers and systems, septic tanks and accessories, storm retention/detention and septic chambers, polyvinyl chloride drainage structures, fittings, and water filters and water separators. [1]

7. Cross slope - Wikipedia

   en.wikipedia.org/wiki/Cross_slope

   Cross slope, cross fall or camber is a geometric feature of pavement surfaces: the transverse slope with respect to the horizon. It is a very important safety factor. Cross slope is provided to provide a drainage gradient so that water will run off the surface to a drainage system such as a street gutter or ditch.