Does crushed rock help with drainage?

Drainage - Depending on how they are used, gravel trenches can help move, direct or drain water. Gravel can also help with drainage by breaking up an expanse of hard, impermeable hardscape.

coastallandscape.com.au - Seven Ways Gravel Can be Used in Your Garden

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Gravel is one of our most versatile landscaping materials. It can be used as a drainage material, as a pathway, a driveway, in water features, around fire pits and even as mulch in garden beds. There are many colours & sizes available, & when used well, can enhance the look of many different landscaping styles. Driveways - As long as it’s properly installed, gravel can easily support wheel traffic from cars & provide a solid surface for a driveway. Gravel driveways work well in areas with heavy rainfall, where permeability is a priority. Walkways - Gravel is a great cost effective walkway material, offering quick drainage. Correct installation as well as the type of gravel you use can make a big difference in how much it rolls. To reduce rolling, choose either a fine gravel, like decomposed granite, or a larger crushed gravel that is heavier & locks itself more firmly into place. Pathways - Gravel works well to fill the gaps between pavers or steppers in courtyards or on pathways. Select a coloured gravel that matches (or contrasts with), the steppers or pavers. Courtyards - Using gravel as a flooring material expands your options for outdoor seating areas. Gravel is a permeable surface, as rainwater drains through the stones. It makes a nice floor that adds texture. Always choose a colour that complements other hardscaping materials & is in keeping with the style of your garden. Water features - Gravel mixed with stones is useful for covering the base of recirculating fountains, filling the bottoms of ponds & lining dry creek beds. Dark-coloured gravel often looks particularly rich in these applications. When water splashes on the gravel it almost appears black, and nearby foliage plants stand out through contrast to create a lush, vibrant look. Drainage - Depending on how they are used, gravel trenches can help move, direct or drain water. Gravel can also help with drainage by breaking up an expanse of hard, impermeable hardscape. Erosion control - Gravel installed on sloped walkways or used as a mulch on hilly beds can help prevent soil erosion. All gravel will help to some degree, but crushed gravels have more angular edges & are better at catching particles of soil & holding them in place if there is running water. One of the best things about gravel is that it is one of the most cost effective landscaping materials. If you are unsure about the best type of granite for your project (or how much you need), give us a call on 5453 7100 and one of our friendly team will help you get you project in motion.

Or else you can browse our full range of gravels here.

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Is sand better than gravel for drainage?

Installing a French drain prevents ground water saturation. Although sand will work for back-filling a French drain, it is not as good a choice as gravel.

ehow.com - Sand Vs. Gravel to Backfill French Drains - eHow

A French drain is an underground drainage system.

A French drain is also known as a sub-drain, a perforated pipe designed to pull excessive water from soil and away from areas such as house foundations. Installing a French drain prevents ground water saturation. Although sand will work for back-filling a French drain, it is not as good a choice as gravel.

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Trench Preparation

Prior to placing the perforated pipe into the trench, line it with geo-textile filter fabric. Cover the perforated pipe with a filter sock, then place it in the trench on top of the filter fabric.

Backfill Gravel

The first back-fill should be washed, crushed rock or gravel that is 3/4 to 1 1/2 inch in diameter. Continue to fill the trench until a 12-inch depth remains from the rock up to the top of the trench. Overlap the filter fabric on top of the gravel. The remainder of the trench is then filled with the soil that was dug out when forming the trench.

Sand

The purpose of a French drain is to form a wick effect that will pull moisture from the surrounding soil and let it drain away from the area. Sand compacts and retains moisture, therefore it does not drain as well as gravel. Although sand is not the best choice for back-filling a French drain, it does work well for some other types of drainage systems.