Error 81 in Hydrocad

[chowdary4569]

Error 81 im getting Pond 12 is exceeding by Pond 11 by 0.35' @ 23.99hrs. How to resolve this issue I have three ponds connecting one to other.
with two pipe culvert outlets to allow the flow from one to other and third pond is having weir outlet.

please help me how to resolve this one ASAP.

 

[psmart]

Please click the message for complete details and solutions:

[81] Warning: {node} Exceeded Pond x by x.x' @ x.x hrs

At some point during the routing, the node's water surface elevation has exceeded the water surface elevation of an inflowing pond, indicating a possible tailwater dependency. The message shows the maximum amount of reverse head and the time at which it occurred.

Important: The pond routing is not altered by this situation, even though the higher tailwater may in reality cause a reduced discharge. To remedy the situation, select a pond routing method that is able to handle tailwater effects, such as the Dynamic Storage-Indication method.

Also see www.hydrocad.net/tailwater.htm