How can I edit this script, that it will check if the character is standing on a specific layer?

Hello all,

I am trying to make a third person game, but my character can jump on water. I am fairly new to scripting and I can't find a way to implement something to the script and stop my character from jumping on water. I think there maybe is a way to check if the character isn't standing on the "water" layer. The problem is, I don't know how to do that.

Edit I found out that it wasn't only the water layer but just when the character was below a certain level of height the controller thought it was onground. If this is fixed I think the problem above is fixed too.

Here's the script:

         // Is the character grounded?
         private void GroundCheck () {
             Vector3 platformVelocityTarget = Vector3.zero;
             platformAngularVelocity = Vector3.zero;
             float stickyForceTarget = 0f;
 
             // Spherecasting
             hit = GetSpherecastHit();
 
             //normal = hit.normal;
             normal = transform.up;
             groundDistance = r.position.y - hit.point.y;
 
             // if not jumping...
             bool findGround = Time.time > jumpEndTime && r.velocity.y < jumpPower * 0.5f;
 
             if (findGround) {
                 bool g = onGround;
                 onGround = false;
 
                 // The distance of considering the character grounded
                 float groundHeight = !g? airborneThreshold * 0.5f: airborneThreshold;
 
                 Vector3 horizontalVelocity = r.velocity;
                 horizontalVelocity.y = 0f;
                 
                 float velocityF = horizontalVelocity.magnitude;
 
                 if (groundDistance < groundHeight) {
                     // Force the character on the ground
                     stickyForceTarget = groundStickyEffect * velocityF * groundHeight;
 
                     // On moving platforms
                     if (hit.rigidbody != null) {
                         platformVelocityTarget = hit.rigidbody.GetPointVelocity(hit.point);
                         platformAngularVelocity = Vector3.Project(hit.rigidbody.
                         angularVelocity, transform.up);
                     }
 
                     //Flag the character grounded
                  
                             onGround = true;
 
                 }
             }
 
     //Interpolate the additive velocity of the platform the character might be standing on
             platformVelocity = Vector3.Lerp(platformVelocity, 
             platformVelocityTarget, Time.deltaTime * platformFriction);
 
             stickyForce = stickyForceTarget;
 
             // remember when we were last in air, for jump delay
             if (!onGround) lastAirTime = Time.time;
         }

 

Thanks