If there’s not enough slope for your drain system to work, you may need to pipe the collected water to a basin in the basement, where a sump pump can lift it and send it to the storm drain system. Cost: $12,000 for a 1,500-square-foot basement 6 feet deep. Install an interior French drain.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/french-drains-when-you-need-them/
Today French drains are used in many forms and go by different names, too. The French Drain System from Basement Systems is a collection of patented basement waterproofing products that work together to keep basements dry. Also Known As. A French drain is sometimes also referred to as drainage tile, a rubble drain, a perimeter drain or weeping tile. WaterGuard® drain pipe has a unique form designed to capture water that leaks through walls and along the floor/wall joint. Once installed, only the narrow top edge of the flange is visible.
http://www.basementsystems.com/basement-waterproofing/french-drain.html
How to Install a French Drain: DIY or Professional? A French drain installation is a simple process that requires a whole lot of digging. Decide to learn how to install a french drain, or if it’s worth hiring a pro. A single exterior French drain trench that’s 50 feet long means excavating about 75 cubic feet of soil. Depending on how wet your soil is (if you have a drainage problem, it’s probably pretty wet), that means 4 to 5 tons of dirt. Not only do you have to dig out the dirt, you’ll have to move it somewhere.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/diy-french-drain/
1 DoItYourself.com explains how to plan a French drain  . A trench is typically dug along the primary route the runoff water follows, and directs the water into a specific area. The trench must always slope downward (about a 1% grade or 1' for every 100') so the water flows freely and doesn't puddle in the trench.
http://home.costhelper.com/french-drain.html
Cost: About $3,000. If you’re building a retaining wall, add a French drain behind the first course of stones or blocks. Otherwise, water moving down the hill will build up behind the wall and undermine it. The pipe should rest on the same compacted gravel base or concrete footing that supports the wall.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/french-drains-when-you-need-them/
When French drains can’t be installed below basement floor level, DryTrack® water containment channel will capture wall and floor-edge seepage to keep the basement floor dry. Sump Pump Systems. Our French drain system delivers all collected water to a sump pump that’s housed in a patented plastic sump liner.
http://www.basementsystems.com/basement-waterproofing/french-drain.html
This type of drain doesn’t have to be very deep — a common size is 2 feet deep and 1.5 feet across. Where the drain passes through areas with trees or shrubs, switch to solid pipe (not perforated) to reduce the risk of roots growing into the piping and clogging it. Cost: $10 to $16 per linear foot.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/french-drains-when-you-need-them/
The French Drain System from Basement Systems is a collection of patented basement waterproofing products that work together to keep basements dry. A French drain is sometimes also referred to as drainage tile, a rubble drain, a perimeter drain or weeping tile.
http://www.basementsystems.com/basement-waterproofing/french-drain.html
Typical costs: Having a landscaper or other professional install outdoor French drains can cost $10-$30 a linear foot but averages about $25/foot depending on depth and width (typically 12-24 deep and 6-18 wide), and local rates. A French drain 30'-50' long might cost $300-$1,500, with prices averaging about $750-$1,250. For example, Galtech.com reports having two French drains installed at an Oregon home for $1,475 for 58' total, about $25-$26 a foot.
http://home.costhelper.com/french-drain.html
Near the top of the wall, fold the cloth over the top of the gravel, and top with several inches of soil. Cost: The added cost to do this while building is very little — just the price of drain gravel ($25 per cubic yard) and pipe (50 cents to $1 per linear foot).
https://www.houselogic.com/organize-maintain/home-maintenance-tips/french-drains-when-you-need-them/
cost to install french drain
The cost is between $10 and $30 linear foot to install french drain. French drain install cost is between $10 and $30 per linear foot.