Can I claim $7500 back yard reslope and french drain in order to stop water from going to foundation.

The IRS does not allow you to claim improvements or repairs to your own home.  You can add the amounts you paid to your basis (what you have in invested in your home) and that can save you money if you sell the home.

If the money was spent on a rental property, then it is deductible.  Enter the amounts on Schedule E.

The work would count as a capital improvement that will increase the cost basis of the house.  That will reduce gains when the house is sold.