periodic spring वाक्य

Should Eddie Jones, whose periodic spring disappearances have become an annual mystery in these parts, be given an EKG to make sure he has a sound heart and not one filled with playoff fear?
The spring apparently got its name because it is a periodic spring, drying up at times for a week, a month, or even two years, so those visiting the site sometimes could not locate the spring on a return trip.
Scientists have long known that manipulating river flows to mimic the seasonal heartbeat of a natural waterway _ in the Missouri's case, a periodic spring surge and ane Fish and Wildlife Service, confronted three years ago with clear threats to the three species, ordered the corps to alter seasonal flows.