Hi Stephanie Burgess

Perhaps you water level is below 0.00"?
If a floor, or fill or or wall, or objects, etc is below 0" and the Yellow man elevation is above 0", the texture will go to the grass because this is at 0"

Try this
- Select the fill--> Edit--> set the object elevation (or using the elevation slider or right clicking the fill)--> 10"--> OK--> apply the texture--> select the fill--> Edit--> set the object elevation (or using the elevation slider or right clicking the fill)--> return it to the previous elevation

If you prefer, change the yellow man or chopper elevation (double click on the icon or using View--> 3D viewing method--> Altitude) to a negative value

Let us know if this solves the problem

Patricia