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Now, perimeter drains do, indeed, get clogged if not designed and installed properly, or maintained from time to time. Fine particles from surrounding soils and tree roots from nearby trees can be cause for clogs. That would have little to do with your sump pump cap.
When installing any perimeter or foundation drain, one should try to provide a "clean-out" after every 2 pipe bends. The "clean-out" is basically a vertical riser from the drain line up to grade with a "wye" connection at the drain pipe, into which a snake or other cleaning mechanism can be introduced to rout out the roots or other debris.